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Document and Entity Information	12 Months Ended
Document and Entity Information	Dec. 31, 2015 shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Trading Symbol	SIMO
Entity Registrant Name	SILICON MOTION TECHNOLOGY CORP
Entity Central Index Key	0001329394
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding	139,521,260

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 180,519	$ 194,211
Short-term investments	4,681	703
Notes and accounts receivable, net	58,979	28,854
Inventories	47,110	44,076
Restricted assets-current	19,328	19,322
Prepaid expenses and other current assets	4,559	3,274
Total current assets	315,176	290,440
Long-term investments	133	133
Property and equipment, net	50,469	35,537
Deferred income tax assets, net	610	1,521
Goodwill	68,660	35,467
Intangible assets, net	7,330
Other assets	3,250	3,436
Total assets	445,628	366,534
Current Liabilities
Notes and accounts payable	22,541	14,246
Income tax payable	13,395	17,696
Current portion of long-term payable	270	478
Accrued expenses and other current liabilities	52,081	23,646
Total current liabilities	88,287	56,066
Long-term payable, net of current portion	78	284
Other long-term liabilities	12,765	6,084
Total liabilities	101,130	62,434
Commitments and Contingencies (Note 16)
Shareholders' Equity
Ordinary Shares at US$ 0.01 par value per share Authorized: 500,000 thousand shares Issued and outstanding: 135,622 thousand shares in 2014 and 139,521 thousand shares in 2015	1,395	1,356
Additional paid-in capital	209,243	190,783
Accumulated other comprehensive income	633	2,505
Retained Earnings	133,227	109,456
Total shareholders' equity	344,498	304,100
Total liabilities and shareholders' equity	$ 445,628	$ 366,534

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Ordinary Shares, par value	$ 0.01	$ 0.01
Ordinary Shares, Authorized	500,000,000	500,000,000
Ordinary Shares, Issued	139,521,000	135,622,000
Ordinary Shares, outstanding	139,521,000	135,622,000

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net sales	$ 361,297	$ 289,323	$ 225,308
COST OF SALES	176,765	139,625	118,698
GROSS PROFIT	184,532	149,698	106,610
OPERATING EXPENSES
Research and development	71,161	60,949	46,460
Sales and marketing	20,173	16,324	13,597
General and administrative	15,714	13,355	11,250
Amortization of intangible assets	1,051	0	0
Total operating expenses	108,099	90,628	71,307
OPERATING INCOME	76,433	59,070	35,303
NON-OPERATING INCOME (EXPENSES)
Gain from disposal of short-term investments	3	4	122
Interest income	2,025	2,215	1,845
Foreign exchange gain (loss), net	76	(606)	(25)
Interest expense	(47)	(114)	(110)
Other income, net	10	(1)	13
Total non-operating income	2,067	1,498	1,845
INCOME BEFORE INCOME TAX	78,500	60,568	37,148
INCOME TAX EXPENSE	18,249	16,101	9,772
NET INCOME	$ 60,251	$ 44,467	$ 27,376
EARNINGS PER ORDINARY SHARE:
Basic	$ 0.44	$ 0.33	$ 0.21
Diluted	$ 0.43	$ 0.33	$ 0.20
WEIGHTED AVERAGE ORDINARY SHARES OUTSTANDING
Basic (Thousands)	138,100	134,604	132,259
Diluted (Thousands)	139,634	136,787	134,567
EARNINGS PER ADS (one ADS equals four ordinary shares):
Basic	$ 1.75	$ 1.32	$ 0.83
Diluted	$ 1.73	$ 1.30	$ 0.81
WEIGHTED AVERAGE ADS OUTSTANDING
Basic (Thousands)	34,525	33,651	33,065
Diluted (Thousands)	34,909	34,197	33,642

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 60,251	$ 44,467	$ 27,376
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX EFFECT OF NIL
Change in net foreign currency translation adjustments	(1,868)	(1,202)	633
Change in deferred pension gain (loss)	(4)	(388)	(203)
OTHER COMPREHENSIVE INCOME (LOSS)	(1,872)	(1,590)	430
TOTAL COMPREHENSIVE INCOME	$ 58,379	$ 42,877	$ 27,806

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Consolidated Statements Of Changes In Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Ordinary Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (accumulated deficit)	Treasury Stock
BEGINNING BALANCE (in shares) at Dec. 31, 2012		130,040
BEGINNING BALANCE at Dec. 31, 2012	$ 262,266	$ 1,300	$ 173,852	$ 3,665	$ 83,449
Net income	27,376				27,376
Other comprehensive income	430			430
Stock-based compensation expenses	10,262		10,262
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units, shares		5,154
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units	346	$ 52	294
Share repurchase	(10,018)					$ (10,018)
Dividends declared (US$0.15 per ordinary share)	(19,965)				(19,965)
Treasury stock retired, shares		(3,564)
Treasury stock retired		$ (36)	(4,392)		(5,590)	$ 10,018
Ending Balance (in shares) at Dec. 31, 2013		131,630
Ending Balance at Dec. 31, 2013	270,697	$ 1,316	180,016	4,095	85,270
Net income	44,467				44,467
Other comprehensive income	(1,590)			(1,590)
Stock-based compensation expenses	10,347		10,347
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units, shares		3,992
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units	460	$ 40	420
Dividends declared (US$0.15 per ordinary share)	(20,281)				(20,281)
Ending Balance (in shares) at Dec. 31, 2014		135,622
Ending Balance at Dec. 31, 2014	304,100	$ 1,356	190,783	2,505	109,456
Net income	60,251				60,251
Other comprehensive income	(1,872)			(1,872)
Issuance of ordinary shares for Shannon Systems acquisition	7,640	$ 16	7,624
Issuance of ordinary shares for Shannon Systems acquisition, Shares		1,560
Stock-based compensation expenses	10,418		10,418
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units, shares		2,339
Issuance of ordinary shares upon exercise of employee stock options and restricted stock units	441	$ 23	418
Dividends declared (US$0.15 per ordinary share)	(36,480)				(36,480)
Ending Balance (in shares) at Dec. 31, 2015		139,521
Ending Balance at Dec. 31, 2015	$ 344,498	$ 1,395	$ 209,243	$ 633	$ 133,227

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares		3 Months Ended								12 Months Ended
	Nov. 02, 2015	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends declared, per share	$ 0.15	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.2625	$ 0.15	$ 0.15

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 60,251	$ 44,467	$ 27,376
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,936	6,917	6,429
Amortization of intangible assets	1,051	0	0
Gain from disposal of short-term investments	(3)	(4)	(122)
Stock-based compensation	10,418	10,347	10,262
Loss on disposal of property and equipment	10	18	5
Deferred income taxes	911	471	1,181
Changes in operating assets and liabilities:
Short-term investments			14,265
Notes and accounts receivable	(29,179)	2,359	5,572
Inventories	(410)	(10,410)	(1,523)
Prepaid expenses and other current assets	(664)	(678)	(403)
Other assets	136	67	(143)
Notes and accounts payable	7,651	(415)	(11,981)
Accrued expenses and other current liabilities	11,020	5,543	(7,415)
Income tax payable	(4,301)	9,507	3,520
Other liabilities	1,119	536	2,105
Net cash provided by operating activities	65,946	68,725	49,128
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of held-to-maturity financial assets	(4,000)
Business acquisition-net of cash and cash equivalents acquired	(30,287)
Increase of prepaid expenses and other current assets	(508)
Return of capital from long-term investments			46
Purchase of property and equipment	(23,664)	(11,596)	(12,772)
Changes in restricted assets	45	(3,817)	(89)
Net cash used in investing activities	(58,414)	(15,413)	(12,815)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of ordinary shares upon exercise of employee stock options	494	514	422
Share repurchase			(10,018)
Dividends paid	(20,765)	(20,224)	(19,897)
Net cash used in financing activities	(20,271)	(19,710)	(29,493)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(12,739)	33,602	6,820
EFFECT OF EXCHANGE RATE CHANGES	(953)	(1,111)	166
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	194,211	161,720	154,734
CASH AND CASH EQUIVALENTS, END OF YEAR	180,519	194,211	161,720
SUPPLEMENTAL INFORMATION
Interest paid	6	71	86
Income taxes paid	20,494	$ 5,892	$ 2,947
Cash paid for Shannon Systems acquisition	30,287
Shannon Systems
CASH FLOWS FROM INVESTING ACTIVITIES
Business acquisition-net of cash and cash equivalents acquired	(30,287)
SUPPLEMENTAL INFORMATION
Fair value of assets acquired, net of cash and cash equivalents acquired	43,662
Other long-term liabilities	(5,735)
Issuance of stock	(7,640)
Cash paid for Shannon Systems acquisition	$ 30,287

Organization and Operations

12 Months Ended

Dec. 31, 2015

Organization and Operations

1. ORGANIZATION AND OPERATIONS

Silicon Motion Technology Corporation (“SMTC”, collectively with its subsidiaries the “Company”) was incorporated in the Cayman Islands on January 27, 2005. The Company is a fabless semiconductor company that designs, develops and markets, high-performance, low-power semiconductor solutions to OEMs and other customers in the mobile storage and mobile communications markets. In the mobile storage market, the Company’s key products are controllers used in embedded storage products such as SSDs, and eMMCs, as well as expandable storage products such as flash memory cards and USB flash drives. For the mobile communications market, the Company’s key products are handset transceivers and mobile TV SoCs.

The Company acquired SMI Taiwan in April 2005. Originally SMI Taiwan was known as Feiya Technology Corporation (“Feiya”), a Taiwan corporation which was incorporated in April 1997 but had changed its name to SMI Taiwan after acquiring in August 2002 Silicon Motion, Inc., a California corporation (“SMI USA”), which was incorporated in November 1995. Feiya was originally a flash memory products company and SMI USA a graphics processor company. In April 2007, the Company acquired FCI, a leading designer of RF ICs for mobile TV and wireless communications based in South Korea. The Company established Silicon Motion BV in the Netherlands in 2011 with the purpose of expanding its business activities in Europe, as well as providing supervisory, financing, legal support, accounting services and shareholding for the Company’s businesses in other parts of the world. In July 2015, the Company acquired Shanghai Baocun Information Technology Co., Ltd. (“Shannon Systems”), China’s leading enterprise-class PCIe SSD company based in Shanghai, China.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2015

Summary of Significant Accounting Policies

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP). The consolidated financial statements include the accounts of SMTC and its wholly-owned subsidiaries. The Company owns 100% of the outstanding shares in all of its subsidiaries, except for FCI which the Company owns over 99.9%. All significant intercompany balances and transactions have been eliminated upon consolidation.

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect certain reported amounts and disclosures. The actual results could differ from those estimates.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to a concentration of credit risk consist of cash, cash equivalents, investment in debt securities and accounts receivable. Cash is deposited with high credit-quality financial institutions. For accounts receivable, the Company performs ongoing credit evaluations of its customers’ financial condition and the Company maintains an allowance for doubtful accounts receivable based upon a review of the expected collectibility of individual accounts.

The Company sells the semiconductor solutions to leading OEMs and module makers, worldwide. Most of the Company’s solid state storage controllers are supplied to NAND flash manufacturers. The Company is the leading merchant supplier of controllers used in client SSD for PCs and eMMC used in smartphones and a leading supplier of controllers used in flash memory cards and USB flash drives. The Company provides the specialty RF ICs primarily to Samsung and other OEMs. Sales to two customers in 2013 and 2014, and one customer in 2015 accounted for 10% or more of the Company’s net sales, represented 46%, 47% and 30% of the Company’s net sales in 2013, 2014 and 2015, respectively. In 2013 and 2014, the significant customers were Samsung and SK Hynix and in 2015, SK Hynix. The Company’s top ten customers in 2013, 2014 and 2015 accounted for approximately 76%, 76% and 72% of net sales.

Fair Value of Financial Instruments

The carrying amount of the Company’s financial instruments, including cash and cash equivalents, notes and accounts receivable and notes and accounts payables approximates fair value due to the short-term maturity of the instruments. Fair values of short-term investments represent quoted market prices, if available. If no quoted market prices are available, fair values are estimated based on discounted cash flow, or other valuation techniques. Long-term investments are privately-held companies where there is no readily determinable market value and are recorded using the cost method, since the cost of obtaining verifiable fair value is unreasonably high. The Company periodically evaluates these investments for impairment. If it is determined that an other-than-temporary decline has occurred in the carrying value, an impairment loss is recorded for that period. The Company’s long-term liabilities approximate their fair values as they contain interest rates that vary according to market interest rates.

Fair value is the price that would be received upon sale of an asset or paid upon transfer of a liability in an orderly transaction between market participants at the measurement date and in the principal or most advantageous market for that assets or liability. The fair value should be calculated based on assumptions that market participants would use in pricing the asset or liability, not on assumptions specific to the Company. A three-tier fair value hierarchy is established as a basis for considering such assumptions and for inputs used in the valuation methodologies in measuring fair value. The hierarchy prioritizes the inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of the three levels which is determined by the lowest level input that is significant to the fair value measurement in its entirety. These levels are:

Level 1 — Use unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2 — Use observable inputs other than Level 1 prices such as quoted prices for identical or similar instruments in markets that are not active, quoted prices for similar instruments in active markets, and model-based valuation in which all significant inputs are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 — Use inputs that are generally unobservable and reflect the use of significant management judgments and estimates.

See Note 18, “Fair Value Measurement”, for the related disclosure.

Cash Equivalents

The Company considers all highly liquid investments to be cash equivalents.

Short-term Investments

The Company’s short-term investments are short-term income yielding investments with original maturities greater than three months from the purchase date and remaining maturities less than one year. These short-term investments consist primarily of bond funds that are bought and held principally for the purpose of selling them in the near term and are classified as trading securities, structured notes designated at the fair value and senior notes classified as held-to-maturity investment with maturities less than one year. Trading securities and structured notes are reported at fair value with the subsequent changes in fair value recorded in earnings as unrealized gains and losses. Senior notes are measured at amortized cost using the effective interest method less any impairment.

Allowance for Doubtful Receivables

An allowance for doubtful receivables is provided based on a review of the collectability of accounts receivables. The Company determines the amount of allowance for doubtful receivables by examining the historical collection experience and current trends in the credit quality of its customers as well as its internal credit policies.

Inventories

Inventories are stated at the lower of cost or market value. Inventories are recorded at standard cost and adjusted to the approximate weighted-average cost at the balance sheet date. Market value represents the current replacement cost for raw materials, work in process and finished goods. The Company assesses its inventory for estimated obsolescence or unmarketable inventory based upon management’s assumptions about future demand and market conditions. In estimating reserves for obsolescence, the Company primarily evaluates estimates based on the timing of the introduction of new products and the quantities remaining of old products and provides reserves for inventory on hand in excess of the estimated demand. Estimated losses on slow-moving items are recognized and included in the allowance for losses.

Long-term Investments

The Company has long-term investments in companies that it does not exercise significant influence and accounts for these investments under the cost method. Management regularly evaluates financial information related to these investments to determine whether an other than temporary decline in their value exists. Factors indicative of an other than temporary decline include recurring operating losses, credit defaults and subsequent rounds of financings at an amount below the cost basis of the investment. Management periodically weighs all quantitative and qualitative factors in determining if any impairment loss exists. When a decline in value is deemed to be other-than-temporary, the Company recognizes an impairment loss in other income and expense.

Property and Equipment

Property and equipment are stated at cost less accumulated depreciation. Significant additions, renewals and betterments are capitalized, while maintenance and repairs are expensed as incurred.

Depreciation is computed using the straight-line method over estimated useful lives that range as follows: buildings — 25 to 50 years; machinery and equipment — 3 to 6 years; furniture and fixtures — 3 to 8 years; software — 1 to 5 years; leasehold and buildings improvement — the shorter of the estimated useful life or lease term, which is generally 2 to 6 years. Depreciation expense recognized for the years ended December 31, 2013, 2014 and 2015 was approximately US$6,429 thousand, US$6,917 thousand and US$7,936 thousand, respectively.

Upon the sale or other disposal of property and equipment, the related cost and accumulated depreciation are removed from the accounts, and any gain or loss is credited or charged to operating income.

Government Grants

Grants received by the Company from the Korean government to assist with specific research and development activities are deducted from those research and development costs incurred, in the period in which the related expenses are incurred, to the extent that they are non-refundable. Government grants that were used for the acquisition of fixed assets are deducted from the acquisition costs of the acquired assets and amortized over the useful lives of the related assets. The Company recognizes refundable government grants as long-term payable and current portion of long-term payable on its consolidated balance sheet.

Goodwill and Intangible Assets

Goodwill is the excess of the purchase price paid over the fair value of the net tangible and intangible assets acquired in a business combination. Intangible assets, which consist primarily of development technology, are amortized over their estimated useful lives, of 3.5 to 4.5 years.

Impairment of Goodwill and Long-Lived Assets

The Company evaluates the recoverability of long-lived assets whenever events or changes in circumstances indicate the carrying value may not be recoverable. The determination of recoverability is based on an estimate of undiscounted cash flows expected to result from the use of an asset and its eventual disposition. The estimate of cash flows is based upon, among other things, certain assumptions about expected future operating performance, growth rates and other factors. Estimates of undiscounted cash flows may differ from actual cash flows due to, among other things, technological changes, economic conditions, changes to the business model or changes in operating performance. If the sum of the undiscounted cash flows is less than the carrying value, an impairment loss is recognized, measured as the amount by which the carrying value exceeds the fair value of the asset. Fair value is determined by reference to quoted market prices, if available, or discounted cash flows, as appropriate. See Note 10, “Goodwill and Acquired Intangible Assets,” regarding impairment testing in fiscal year 2013, 2014 and 2015.

The Company monitors the recoverability of goodwill recorded in connection with acquisitions, by reporting unit, annually, or sooner if events or changes in circumstances indicate that the carrying amount may not be recoverable. The Company conducts its annual impairment test of goodwill on November 30. Reporting units may be operating segments as a whole or an operation one level below an operating segment, referred to as a component. Goodwill impairment is tested using a two-step approach. The first step compares the fair value of a reporting unit to its carrying amount, including goodwill. If the fair value of the reporting unit is greater than its carrying amount, goodwill is not considered impaired and the second step is not required. If the fair value of the reporting unit is less than its carrying amount, the second step of the impairment test measures the amount of the impairment loss, if any, by comparing the implied fair value of goodwill to its carrying amount. If the carrying amount of goodwill exceeds its implied fair value, an impairment loss is recognized equal to that excess. The implied fair value of goodwill is calculated in the same manner that goodwill is calculated in a business combination, whereby the fair value of the reporting unit is allocated to all of the assets and liabilities of that unit, with the excess purchases price over the amounts assigned to assets and liabilities. Estimating fair value is performed by utilizing various valuation approaches, such as income approach or market approach. The total of all reporting unit fair values was also compared to the Company’s market capitalization plus control premium for reasonableness. See Note 10, “Goodwill and Acquired Intangible Assets,” regarding impairment testing.

Other Assets

Other assets primarily consist of industrial property right and deposits for office leases.

Restricted Assets

Restricted assets consist of deposits required for litigation and restricted cash. Restricted cash represents cash set aside as collateral for obtaining capacity and borrowings as well as cash received from government grants with restriction on its usage.

Other long-term liabilities

Other long-term liabilities primarily consist of payable to former shareholders of Shannon Systems and unrecognized tax benefit.

Pension Costs

Revenue Recognition

Revenue from product sales is generally recognized upon shipment to the customer provided that the Company has received a signed purchase order, the price is fixed or determinable, transfer of title has occurred in accordance with the shipping terms specified in the arrangement with the customer, collectibility from the customer is considered reasonably assured, product returns are reasonably estimable and there are no remaining significant obligations or customer acceptance requirements. Revenue on development service orders is generally recognized upon completion and customer acceptance of contractually agreed milestones.

The Company grants certain distributors limited rights of return and price protection rights on unsold products. The return rights are generally limited to five percent of the monetary value of products purchased within the preceding six months, provided that the distributor places a corresponding restocking order of equal or greater value. An allowance for sales returns for distributors and all customers is recorded at the time of sale based on historical returns information available, management’s judgment and any known factors at the time the financial statements are prepared that would significantly affect the allowance. Price protection rights are based on the inventory products the distributors have on hand at the date the price protection is offered. A reserve for price adjustments is recorded based on the estimated products on hand at the distributors and historical experience. The Company incurred actual price adjustments to distributors are minimal.

The Company provides a warranty period of one year for manufacturing defects of its products. Warranty returns have been infrequent and relate to defective or off-specification parts. The Company estimates a reserve for warranty based on historical experience and records this amount to cost of sales. For the years ended December 31, 2013, 2014 and 2015, the Company did not experience significant costs associated with warranty returns.

Research and Development

Research and development costs consist of expenditures incurred during the course of planned research and investigation aimed at the discovery of new knowledge that will be useful in developing new products or at significantly enhancing existing products as well as expenditures incurred for the design and testing of product alternatives. All expenditures related to research and development activities of the Company are charged to operating expenses when incurred. Third-party research and development costs are expensed when the contracted work has been performed or as milestone results have been achieved.

Income Taxes

The provision for income tax represents income tax paid and payable for the current year plus the changes in the deferred income tax assets and liabilities during the years. Deferred income tax assets are recognized for net operating loss carryforwards, research and development credits, and temporary differences. The Company believes that uncertainty exists regarding the realizability of certain deferred income tax assets and, accordingly, has established a valuation allowance for those deferred income tax assets to the extent the realizability is not deemed to be more likely than not. Deferred income tax assets and liabilities are measured using enacted tax rates. The Company has classified deferred tax assets and liabilities as noncurrent on the consolidated balance sheets as of December 31, 2015 and 2014 as the Company has early adopted Accounting Standards Update (“ASU”) 2015-17, Balance Sheet Classification of Deferred Taxes, on a retrospective basis.

The Company utilizes a two step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates it is more likely than not that the position will be sustained in a dispute with taxing authorities, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount which is more than 50% likely of being realized upon ultimate settlement.

SMI Taiwan, the Company’s largest operating company is a Taiwan registered company. Under Taiwan tax regulations, the current year’s earnings, on an after tax basis, that are not distributed in the following year are subject to a 10% surtax income tax. This 10% surtax income tax is recognized in the period during which the related earnings are generated.

The Taiwan government enacted the Income Basic Tax Act (“the IBT Act”), which became effective on January 1, 2006. The alternative minimum tax (“AMT”) imposed under the IBT Act is a supplemental tax levied at a rate of 10% which is payable if the income tax payable determined pursuant to the Income Tax Law is below the minimum amount prescribed under the IBT Act. The taxable income for calculating the AMT includes most of the income that is exempted from income tax under various laws and statutes. The Company has considered the impact of the IBT Act in the determination of its tax liabilities. Under the IBT Act amended in August 2012, the standard deduction and the tax rate of AMT were amended from NT$1,000 thousand to be NT$500 thousand and from 10% to 12%, respectively. The amended IBT Act is effective on January 1, 2013.

Foreign Currency Transactions

Foreign currency transactions are recorded at the rates of exchange in effect when the transaction occurs. Gains or losses, resulting from the application of different foreign exchange rates when cash in foreign currency is converted into the entities’ functional currency, or when foreign currency receivables and payables are settled, are credited or charged to income in the period of conversion or settlement. At the balance sheet date, assets and liabilities denominated in foreign currencies are remeasured based on prevailing exchange rates and any resulting gains or losses are credited or charged to income.

Translation of Foreign Currency Financial Statements

The reporting currency of the Company is the U.S. dollars. The functional currency of some of the Company’s subsidiaries is the local currency of the respective entity. Accordingly, the financial statements of the foreign subsidiaries were translated into U.S. dollars at the following exchange rates: assets and liabilities — current rate on the balance sheet date; shareholders’ equity — historical rates; income and expenses — average rate during the period. The resulting translation adjustment is recorded as a separate component of comprehensive income.

Comprehensive Income (Loss)

Comprehensive income and loss represents net income (loss) plus the results of certain changes in shareholders’ equity during a period from non-owner sources. The following table presents the components of accumulated other comprehensive income (loss) as of December 31, 2013, 2014 and 2015:


	Year Ended December 31, 2013							Year Ended December 31, 2014									Year Ended December 31, 2015
	US$							US$									US$
	Foreign currency items		Defined benefit pension plans			Accumulated other comprehensive income (loss)		Foreign currency items			Defined benefit pension plans			Accumulated other comprehensive income (loss)			Foreign currency items			Defined benefit pension plans			Accumulated other comprehensive income (loss)
Beginning balance		3,923		(258	)		3,665		4,556			(461	)		4,095			3,354			(849	)		2,505
Current-period change		633		(203	)		430		(1,202	)		(388	)		(1,590	)		(1,868	)		(4	)		(1,872	)

Ending balance		4,556		(461	)		4,095		3,354			(849	)		2,505			1,486			(853	)		633

Legal Contingencies

The Company is currently involved in various claims and legal proceedings. Periodically, the Company reviews the status of each significant matter and assesses the potential financial exposure. If the potential loss from any claim or legal proceeding is considered probable and the amount can be estimated, the Company accrues a liability for the estimated loss. Because of uncertainties related to these matters, accruals are based only on the best information available at the time. As additional information becomes available, the Company reassesses the potential liability related to the pending claims and litigation and revises these estimates as appropriate. Such revisions in the estimates of the potential liabilities could have a material impact on the results of operations and financial position.

Earnings Per Share

Basic earnings per share are computed by dividing net earnings attributable to ordinary shareholders by the weighted average number of ordinary shares outstanding during the period. Diluted earnings per share reflect the potential dilution that could occur if stock options and other dilutive securities were exercised. Dilutive securities are excluded from the computation of the diluted income per share in periods when their effect is anti-dilutive. The Company’s dilutive securities consist of employee stock options and restricted stock units. The effect of dilutive securities including employee stock options and restricted stock units were 2,308 thousand shares (577 thousand ADSs), 2,183 thousand shares (546 thousand ADSs) and 1,534 thousand shares (384 thousand ADSs) for the years ended December 31, 2013, 2014 and 2015, respectively.

Stock-Based Compensation

The Company accounts for stock-based compensation in accordance with ASC 718 Compensation — Stock Compensation. The Company uses the Black-Scholes valuation model for the valuation of stock options and recognizes compensation expense on a straight-line basis over the requisite service period of the award. The value of our restricted stock units is based on the fair value of our shares on the date of grant and expensed over the vesting period.

Prior to the initial declaration of a quarterly cash dividend on January 22, 2013, the fair value of restricted stock units (“RSUs”) was measured based on the grant date share price, as the Company did not historically pay cash dividends on our common stock. For awards granted on or subsequent to January 22, 2013, the fair value of RSUs was measured based on the grant date share price, less the present value of expected dividends during the vesting period, discounted at a risk-free interest rate.

Treasury Stock

Treasury stock is stated at cost and shown as a reduction to shareholders’ equity.

The Company retires ordinary shares repurchased under a share repurchase plan. Accordingly, upon retirement the excess of the purchase price over par value is allocated between additional paid-in capital and retained earnings based on the average issuance price of the shares repurchased. A repurchase of ADSs is recorded as treasury stock until the Company completes the withdrawal of the underlying ordinary shares from the ADS program.

Dividends

Our Board of Directors declared payment of our first quarterly dividend on our common stock in January 2013 and the first dividend payment was made on March 4, 2013. Our Board of Directors has subsequently declared and paid dividends in each successive quarter. On November 2, 2015, our Board of Directors, instead of declaring a quarterly dividend, declared an annual dividend payable in four quarterly installments. The payment of future cash dividends are subject to the Board’s continuing determination that the payment of dividends are in the best interests of the Company’s shareholders and are in compliance with all laws and agreements of the Company applicable to the declaration and payment of cash dividends.

Recent Accounting Pronouncements

In April 10, 2014, the FASB issued an accounting update, which changes the criteria for reporting discontinued operations for all public and nonpublic entities. The guidance requires only disposals that represent a strategic shift that has (or will have) a major effect on the entity’s results and operations would qualify as discontinued operations. The guidance also requires entities 1) to expand their disclosures about discontinued operations to include more information about assets, liabilities, income, and expenses and 2) to disclose the pre-tax income attributable to a disposal of “of an individually significant component of an entity that does not qualify for discontinued operations presentation in the financial statements.” The guidance is effective for fiscal years beginning after December 15, 2014 and early adoption is prohibited. The adoption of this guidance did not have a material impact on the Company’s results of operations, financial position or cash flow.

In May 2014, the FASB issued a new standard related to revenue recognition. Under the new standard, recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In addition, the new standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. In August 2015, the FASB issued an amendment to defer the effective date. The new standard is effective for fiscal years beginning after December 15, 2017 and early adoption is permitted for annual reporting periods beginning after December 15, 2016. In March and April 2016, the FASB issued two accounting updates to clarify the implementation guidance on principal versus agent considerations, performance obligations and the licensing. The new guidance is required to be applied retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initially applying it recognized at the date of initial application. The Company is in the process of evaluating this guidance to determine the impact it will have on the consolidated financial statements.

In June 2014, the FASB issued an accounting update, which clarifies the accounting for share-based payments. The guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period is treated as a performance condition. The guidance is effective for fiscal years beginning after December 15, 2015 and early adoption is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s results of operations, financial position or cash flow.

In August 2014, the FASB issued new standard related to the presentation of financial statements when there may be conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern. This standard sets forth management’s responsibility to evaluate, each reporting period, whether there is substantial doubt about our ability to continue as a going concern, and if so, to provide related footnote disclosures. The standard is effective for fiscal years beginning after December 15, 2016 and early adoption is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s results of operations, financial position or cash flow.

In February 2015, the FASB issued an accounting update to amend the consolidation analysis. All legal entities are subject to reevaluation under the revised consolidation model. The amendment is effective for fiscal years beginning after December 15, 2015 and early adoption is permitted. The adoption of this amendment is not expected to have a material impact on the Company’s results of operations, financial position or cash flow.

In April 2015, the FASB issued an accounting update regarding the measurement date of a defined benefit obligation and plan assets. The amendment permits the entity with a fiscal year-end that does not coincide with a month-end to measure defined benefit plan assets and obligations using the month-end that is closest to the entity’s fiscal year-end. If a contribution or significant event (such as a plan amendment, settlement, or curtailment that calls for a remeasurement in accordance with existing requirements) occurs between the month-end date used to measure defined benefit plan assets and obligations and an entity’s fiscal year-end, the entity should adjust the measurement of defined benefit plan assets and obligations to reflect the effects of those contributions or significant events. This amendment is effective for fiscal years beginning after December 15, 2016 and early application is permitted. The adoption of this amendment is not expected to have a material impact on the Company’s results of operations, financial position or cash flow.

In May 2015, the FASB issued an accounting update regarding disclosures for investments that calculate net asset value per share. The amendment removes the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. Instead, an entity is required to include those investments as a reconciling line item so that the total fair value amount of investments in the disclosure is consistent with the amount on the balance sheet. Further, the amendment removes the requirement to make certain disclosures for all investments that are eligible to be measured at fair value using the net asset value per share practical expedient. Rather, those disclosures are limited to investments for which the entity has elected to measure the fair value using the practical expedient. The amendment is effective for fiscal years beginning after December 15, 2015. The amendment must be applied retrospectively and early adoption is permitted. The adoption of this amendment is not expected to have a material impact on the Company’s financial statement disclosure.

In July 2015, the FASB issued an accounting update to simplify the measurement of inventory. The amendment requires the measurement of inventory at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. The amendment applies to inventories for which cost is determined by methods other than the last-in first-out and the retail inventory methods. This amendment is effective prospectively for annual periods beginning after December 15, 2016 and early application is permitted. The adoption of this amendment is not expected to have a material impact on the Company’s results of operations, financial position or cash flow.

In September 2015, the FASB issued an accounting update regarding simplifying the accounting for measurement period adjustments attributable to an acquisition. The amendment requires an acquirer must recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The adjustments should reflect the impact on earnings of changes in depreciation, amortization, or other income effects, if any, as if the accounting had been completed as of the acquisition date. Additionally, amounts recorded in the current period that would have been reflected in prior reporting periods if the adjustments had been recognized as of the acquisition date must be disclosed either on the face of the income statement or in the notes to financial statements. This amendment is effective prospectively for annual periods beginning after December 15, 2015 and early application is permitted. The adoption of this guidance is not expected to have a material effect on the Company’s financial condition, results of operations, cash flow and financial statement disclosures.

In November 2015, the FASB issued an accounting update to simplify the presentation of deferred income taxes. The amendment requires that deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. The current requirement that deferred tax liabilities and assets of a tax-paying component of an entity be offset and presented as a single amount is not affected by the amendments in this guidance. This amendment is effective prospectively or retrospectively for annual periods beginning after December 15, 2016 and early application is permitted. The Company has elected to adopt the amendment as of December 31, 2015, and the retrospective adoption is applied to prior reporting period presented. The adoption of this amendment did not have a material impact on the Company’s financial position.

Prior to the adoption, noncurrent deferred income tax assets and current deferred income tax liabilities for the year ended December 31, 2014 are US$1,909 thousand and US$388 thousand, respectively. To early adopt ASU 2015-17, the Company has reclassified current deferred income tax liabilities of US$388 thousand to noncurrent deferred tax liabilities by presenting against the noncurrent deferred income tax assets of US$1,909 thousand. After the adjustment, the noncurrent deferred income tax assets are US$1,521 thousand as of December 31, 2014.

In February 2016, the FASB issued a new standard regarding leases. The new standard requires an entity to recognize assets and liabilities arising from a lease for both financing and operating leases other than that the entity elects the short-term lease recognition and measurement exemption. Qualitative and quantitative disclosures will be enhanced to better understand the amount, timing and uncertainty of cash flows arising from leases. This standard is effective for fiscal years beginning after December 15, 2018, and early adoption is permitted. The Company is in the process of evaluating this guidance to determine the impact it will have on the consolidated financial statements.

In March 2016, the FASB issued an accounting update to simplify several aspects of the accounting for share-based payment award transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The amendment is effective for fiscal years beginning after December 15, 2016, and earlier adoption is permitted. The Company is currently evaluating the impact that the adoption will have on its results of operations, financial position, cash flow and disclosures.

Business Acquisition

12 Months Ended

Dec. 31, 2015

Business Acquisition

3. BUSINESS ACQUISITION

On July 1, 2015, the Company completed its acquisition of Shannon Systems, China’s leading enterprise-class PCIe SSD company based in Shanghai, China. In exchange for 100% of outstanding shares of common stock of Shannon Systems, the Company issued 1,560 thousand ordinary shares with fair value of US$7,640 thousand and paid approximately US$37,925 thousand in cash. The value of the 1,560 thousand ordinary shares issued was determined based on the average market price of the Company’s ordinary shares over the 20-day period before the terms of the acquisition were agreed to and announced. In 2015, the Company incurred US$359 thousand of acquisition costs which comprise primarily of transaction fees and direct acquisition costs, including legal, accounting, and other professional fees. These costs are included in the line item of “operating expenses - general and administrative” on the consolidated statements of income. The acquisition will expand the Company’s portfolio of embedded storage products.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the date of acquisition:


	US$
Cash and cash equivalents		1,903
Accounts receivable, net		946
Inventories		2,624
Other current assets		289
Property and equipment		71
Goodwill		33,204
Identifiable intangible assets		8,381
Accounts payable		(644	)
Accrued expenses and other current liabilities		(1,209	)

Net assets acquired		45,565

As of December 31, 2015, of the cash consideration of approximately US$37,925 thousand, US$5,735 thousand has not been paid to the former shareholders of Shannon Systems as of December 31, 2015 and are included in other long-term liabilities on the consolidated balance sheets.

The excess of the purchase price over the fair value of the net tangible assets acquired has been reflected as identifiable intangible assets. The identifiable intangible assets and respective useful lives are as follows:


	US$		Useful Life
Developed technology		3,789		3.5
In-process research and development (“IPR&D”)		4,592		indefinite

Total identifiable intangible assets		8,381

Developed technology represented the existing know-how in enterprise-class PCIe SSD including all the developed and in-process products for the Shannon Systems business.

The estimated fair value of IPR&D was defined as research and development projects related to enterprise-class PCIe SSDs in-process at the time of the transaction that had not demonstrated their technological feasibility and that do not have an alternative future use.

Goodwill represents the excess of the purchase price over the estimated fair values of the net tangible and intangible assets. The factors that contributed to the recognition of goodwill primarily relate to expansion into new product areas and potential synergies created from combined capabilities, and goodwill is not expected to be deductible for tax purposes.

The results of Shannon Systems since the acquisition date included on the consolidated statement of income for the year ended December 31, 2015 were as follows:


	US$
Net sales		9,049
Net income		421

The operating results of Shannon Systems have been included in the Company’s operations beginning July 1, 2015. The following unaudited pro forma information represents a summary of the results of operations as if the acquisition occurred on January 1, 2014 and 2015 and includes certain pro forma adjustments, including amortization of identifiable intangibles from that date (in thousands except earnings per share):


	Year Ended December 31
	2014		2015
Net sales		293,562		364,670
Net income		42,483		58,468
Earnings per share
Basic		0.31		0.42
Diluted		0.31		0.42
Weighted average ordinary shares outstanding (thousand)
Basic		136,164		138,880
Diluted		138,347		140,414

The pro forma results are based on various assumptions and are not necessarily indicative of what would have occurred had the acquisition closed on January 1, 2014 and 2015.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Topic 805
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-Section 50
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Cash And Cash Equivalents

12 Months Ended

Dec. 31, 2015

Cash And Cash Equivalents

4. CASH AND CASH EQUIVALENTS


	December 31
	2014		2015
	US$		US$
Cash and deposits in bank		38,851		28,780
Time deposits		155,360		151,739

		194,211		180,519

- Definition

The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.

+ References + Details

Short-Term Investments

12 Months Ended

Dec. 31, 2015

Short-Term Investments

5. SHORT-TERM INVESTMENTS


	December 31
	2014		2015
	US$		US$
Trading securities		703		681
Held-to-maturity investments		—		4,000

		703		4,681

The Company classified certain short-term investments as trading securities in 2013, 2014 and 2015. Realized gains on sales of these trading securities were US$4 thousand, US$4 thousand and US$3 thousand for the years ended December 31, 2013, 2014 and 2015, respectively. The amount of unrealized losses related to trading securities at year end was nil for the years ended December 31, 2013, 2014 and 2015, respectively. Structured notes matured in May 2013 and the Company recognized the gain of US$118 thousand.

The held-to-maturity investments are senior notes. In July 2015, the Company purchased senior notes which will be matured in July 2016 with a coupon rate of 1.65% and an effective interest rate of 1.65%, at par value of US$4,000 thousand.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Notes and Accounts Receivable

12 Months Ended

Dec. 31, 2015

Notes and Accounts Receivable

6. NOTES AND ACCOUNTS RECEIVABLE


	December 31
	2014			2015
	US$			US$
Notes receivable		192			16
Trade accounts receivable		31,256			61,293

		31,448			61,309
Allowance for doubtful accounts		(1,167	)		(775	)
Allowance for sales returns and discounts		(1,427	)		(1,555	)

		28,854			58,979

The changes in the allowances are summarized as follows:


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Allowances for doubtful accounts
Balance, beginning of year		1,634			1,275			1,167
Reversals charged to expense, net		(359	)		(108	)		(392	)
Write-offs		—			—			—

Balance, end of year		1,275			1,167			775


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Allowances for sales returns and discounts
Balance, beginning of year		1,919			1,059			1,427
Additions charged to expense, net		1,320			1,600			1,753
Actual sales return and discount		(2,180	)		(1,232	)		(1,625	)

Balance, end of year		1,059			1,427			1,555

Inventories

12 Months Ended

Dec. 31, 2015

Inventories

7. INVENTORIES

The components of inventories are as follows:


	December 31
	2014		2015
	US$		US$
Finished goods		9,787		13,860
Work in process		20,835		21,201
Raw materials		13,454		12,049

		44,076		47,110

The Company wrote down US$2,503 thousand, US$4,561 thousand and US$2,525 thousand in 2013, 2014 and 2015, respectively, for estimated obsolete or unmarketable inventory.

Long-Term Investments

12 Months Ended

Dec. 31, 2015

Long-Term Investments

8. LONG-TERM INVESTMENTS

As of December 31, 2014 and 2015, the Company held equity investments in several privately-held companies with the carrying value as follows:


	Percentage of Ownership						December 31
	2014			2015			2014		2015
							US$		US$
Cost method:
Cashido Corp. (Cashido)		2.1	%		2.1	%		104		104
Vastview Technology, Corp. (Vastview)		2.9	%		2.9	%		29		29

								133		133

In July 2001, the Company invested in the common stock of Cashido. At the time of our investment, Cashido manufactured flash memory storage devices. Cashido currently focuses on the manufacture of computer accessories and ozone based sterilization devices.

In December 2006 and February 2007, the Company invested US$3,360 thousand in the common stock of Vastview. Vastview is a fabless semiconductor company that develops and markets driver ICs and other ICs for the TFT-LCD industry. In 2009 and 2013, the Company received US$808 thousand and US$46 thousand from Vastview which reduced its share capital. From 2008 to 2010, the Company had recognized impairment charges of US$2,462 thousand in its investment in Vastview. No impairment charges were incurred since 2011.

The Company accounts for these investments using the cost method. These investments are evaluated for impairment on an annual basis or as circumstances warrant. The Company believed there was no other than temporary impairment for the years ended December 31, 2013, 2014 and 2015, respectively.

Property and Equipment

12 Months Ended

Dec. 31, 2015

Property and Equipment

9. PROPERTY AND EQUIPMENT


	December 31
	2014		2015
	US$		US$
Cost:
Land		8,058		8,813
Buildings		19,813		21,254
Machinery and equipment		13,443		15,995
Furniture and fixtures		5,131		6,446
Leasehold and buildings improvement		4,229		4,656
Software		29,796		17,505

Total		80,470		74,669

Accumulated depreciation:
Buildings		2,240		2,648
Machinery and equipment		10,573		11,983
Furniture and fixtures		3,492		3,980
Leasehold and buildings improvement		3,064		3,358
Software		25,807		14,421

		45,176		36,390
Prepayment and construction in progress		243		12,190

		35,537		50,469

In April 2006, the Company leased properties located in Taipei, Taiwan, to a third party under a three-year operating lease. Net carrying value of the properties as of December 31, 2015 was US$746 thousand. The lessee renewed the three year operating lease with the Company in March 2012 and 2015. Annual rental income from the lease is about US$41 thousand each year.

Goodwill and Acquired Intangible Assets

12 Months Ended

Dec. 31, 2015

Goodwill and Acquired Intangible Assets

10. GOODWILL AND ACQUIRED INTANGIBLE ASSETS

Intangible assets: The intangible assets acquired from the Company’s acquisition of FCI and Centronix in 2007 and Shannon Systems in 2015 are as follows:


	December 31
	2014										2015
	US$										US$
	Cost		Accumulated Impairment			Accumulated Amortization			Net Carrying Amount		Cost		Accumulated Impairment			Accumulated Amortization			Net Carrying Amount
Core technology		15,809		(4,474	)		(11,335	)		—		15,809		(4,474	)		(11,335	)		—
Customer relationship		8,325		—			(8,325	)		—		8,325		—			(8,325	)		—
Order backlog		1,243		—			(1,243	)		—		1,243		—			(1,243	)		—
Developed technology		—		—			—			—		8,381		—			(1,051	)		7,330

Total		25,377		(4,474	)		(20,903	)		—		33,758		(4,474	)		(21,954	)		7,330

No impairment losses were recognized in 2013, 2014 and 2015. Amortization expense of acquisition-related intangible assets for the years ended December 31, 2013, 2014 and 2015 was nil, nil and US$ 1,051 thousand, respectively.

Goodwill: Goodwill is not amortized, but instead is reviewed and tested for impairment at least annually and whenever events or circumstances occur which indicate that goodwill might be impaired. Impairment of goodwill is tested at the Company’s reporting unit level by comparing the carrying amount, including goodwill, to the fair value. In performing the analysis, the Company uses the best information available, including reasonable and supportable assumptions and projections. If the carrying amount of the reporting unit exceeds its implied fair value, goodwill is considered impaired and a second step is performed to measure the amount of impairment loss, if any. The Company performed its annual impairment test on November 30. The goodwill that resulted from the Company’s acquisition of FCI and Centronix in 2007 and purchased BTL’s assets in 2011 was US$66,300 thousand. The Company’s fiscal 2013, 2014 and 2015 impairment test concluded there was no impairment. The goodwill that resulted from the Company’s acquisition of Shannon Systems in 2015 was US$33,204 thousand. Total goodwill was US$35,467 thousand and US$68,660 thousand as of December 31, 2014 and 2015, respectively.


	December 31
	2014										2015
	US$										US$
	Cost		Accumulated Impairment			Foreign Currency Adjustment			Net Carrying Amount		Cost		Accumulated Impairment			Foreign Currency Adjustment			Net Carrying Amount
Goodwill		66,300		(30,808	)		(25	)		35,467		99,504		(30,808	)		(36	)		68,660

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2015

Accrued Expenses and Other Current Liabilities

11. ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES


	December 31
	2014		2015
	US$		US$
Wages and bonus		12,093		20,365
Dividends		153		15,839
Research and development payable		2,468		2,953
License fees and royalties		2,982		4,173
Professional fees		1,714		2,126
Equipment		1,170		1,285
Others		3,066		5,340

		23,646		52,081

Pension Plan

12 Months Ended

Dec. 31, 2015

Pension Plan

12. PENSION PLAN

SMI Taiwan, the Company’s largest operating company is a Taiwan registered company and subject to Taiwan’s Labor Pension Act (the “Act”), which became effective on July 1, 2005, and the pension mechanism under the Act is deemed a defined contribution plan. The employees who were subject to the Labor Standards Law prior to July 1, 2005 were allowed to choose to be subject to the pension mechanism under the Act or continue to be subject to the pension mechanism under the Labor Standards Law. For those employees who were subject to the Labor Standards Law prior to July 1, 2005 and still work for the same company after July 1, 2005 and have chosen to be subject to the pension mechanism under the Act, their seniority as of July 1, 2005 were maintained. The Act prescribes that the rate of contribution by an employer to employees’ pension accounts per month will not be less than 6% of each employee’s monthly salary. According to the Act, SMI Taiwan made monthly contributions and recognized pension costs of US$788 thousand, US$872 thousand and US$1,015 thousand for the years ended December 31, 2013, 2014 and 2015, respectively.

The Company provides a defined benefit plan to the employees of SMI Taiwan under the Labor Standards Law that offers benefits based on an employee’s length of service and average monthly salary for the six-month period prior to retirement. The Company contributes an amount equal to 2% of salaries paid each month to a pension funds (the “Funds”), which is administered by the Labor Pension Fund Supervisory Committee established by the government (the “Committee”) and deposited in the Committee’s name in the Bank of Taiwan. Before the end of each year, the Company assesses the balance in the Funds. If the amount of the balance in the Funds is inadequate to pay retirement benefit for employees who conform to retirements in the next year, the Company is required to fund the difference in one appropriation that should be made before the end of March of the next year. The government is responsible for the administration of all the defined benefit plans for the companies in Taiwan under the Labor Standards Law. The government also sets investment policies and strategies, determines investment allocation and selects investment managers. As of December 31, 2014 and 2015, the asset allocation was primarily in cash, equity securities and debt securities. Furthermore, under the Labor Standards Law, the rate of return on assets shall not be less than the average interest rate on a two-year time deposit published by the local banks. The government is responsible for any shortfall in the event that the rate of return is less than the required rate of return. However, information on how investment allocation decisions are made, inputs and valuation techniques used to measure the fair value of plan assets, the effect of fair value measurements using significant unobservable inputs on changes in plan assets for the period and significant concentrations of risk within plan assets is not fully made available to the Company by the government. Therefore, the Company is unable to provide the required fair value disclosures related to pension plan assets. Future contributions will be based on 2% of the employee salaries at that time. The Company estimates its contribution for the year ending December 31, 2016 to be US$57 thousand which was determined based on 2% of estimated salaries in 2016.

Starting in 2010, the Company provides a defined benefit pension plan to the Korean employees of FCI, the Company’s second largest operating subsidiary with at least one year of service. FCI’s overall investment strategy is to avoid a negative return on plan assets. FCI estimates its contribution for the year ending December 31, 2016 to be US$745 thousand.

For employees under defined contribution pension plans, pension costs are recorded based on the actual contributions made to employees’ individual pension accounts. For employees under defined benefit pension plans, pension costs are recorded based on actuarial calculations. Determining the cost associated with such benefits is dependent on various actuarial assumptions, including discount rate, expected return on plan assets, compensation increase, employee mortality and turnover rates. The Company reviewed its actuarial assumptions at the measurement date on December 31 every year. The effect of modifications to assumptions is recorded in accumulated other comprehensive loss and amortized to net periodic cost over future periods using the corridor method. The Company believes that assumptions utilized in recording its obligations under its plans are reasonable based on its experience and market conditions. Independent actuaries perform the required calculations to determine expense in accordance with U.S. GAAP. Actual results may differ from the actuarial assumptions and are generally accumulated and amortized into earnings over future periods. The net periodic costs are recognized as employees render services necessary to earn the benefits.

The changes in benefits obligation and plan assets and the reconciliation of funded status are as follows:


	December 31
	2013			2014			2015
	US$			US$			US$
Change in benefit obligation
Projected benefit obligation at beginning of year		1,897			2,098			3,320
Service cost		440			437			273
Interest cost		58			58			57
Actuarial loss(gain)		(202	)		814			79
Benefits paid		(95	)		(87	)		(97	)

Projected benefit obligation at end of year		2,098			3,320			3,632

Change in plan assets
Fair value of plan assets at beginning of year		1,925			2,319			2,556
Actual return on plan assets		43			31			33
Employer contributions		433			282			328
Benefits paid		(82	)		(76	)		(117	)

Fair value of plan assets at end of year		2,319			2,556			2,800

Funded status recognized as an other asset (liabilities)		221			(764	)		(832	)

Amounts recognized in accumulated other comprehensive income consist of the following:


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Net loss		460		848		852
Transition obligation		1		1		1

Total recognized in accumulated other comprehensive income		461		849		853

The accumulated benefit obligation for all defined benefit pension plans was US$1,369 thousand, US$1,762 thousand and US$2,098 thousand at December 31, 2013, 2014 and 2015, respectively.

The components of net periodic benefit cost are as follows:


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Service cost		440			437			273
Interest cost		58			58			57
Projected return on plan assets		(47	)		(51	)		(47	)
Amortization of unrecognized net transition obligation and unrecognized net actuarial gain		(3	)		(19	)		27

Net periodic benefit cost		448			425			310

Other changes in plan assets and benefit obligation recognized in other comprehensive loss:


	2013		2014		2015
	US$		US$		US$
Recognize the decrease in net gain		203		388		4
Amortization of net gain		—		—		—

Total recognized in other comprehensive loss		203		388		4

The estimated net gain for the defined benefit pension plans that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year is US$19 thousand.

Expected benefit payments:


	US$
2016		146
2017		290
2018		175
2019		140
2020		120
2021 and thereafter		748

The actuarial assumptions to determine the benefit obligations were as follows:


	2013						2014						2015
	Taiwan			Korea			Taiwan			Korea			Taiwan			Korea
Weighted-average assumptions used to determine benefit obligations:
Discount rate		1.88	%		5.20	%		2.00	%		4.10	%		1.75	%		3.90	%
Rate of compensation increase		4.25	%		2.60	%		4.25	%		5.00	%		4.25	%		4.00	%
Weighted-average assumptions used to determine net projected benefit cost:
Discount rate		1.88	%		5.20	%		2.00	%		4.10	%		1.75	%		3.90	%
Expected long-term return on plan assets		2.00	%		3.00	%		2.00	%		2.00	%		2.00	%		1.20	%
Rate of compensation increase		4.25	%		2.60	%		4.25	%		5.00	%		4.25	%		4.00	%

In 2014 and 2015, FCI’s pension plan assets were invested in principal guaranteed interest insurance contracts and fixed bank deposits, which are principal and interest guaranteed products and are classified as Level 2. These Level 2 securities were valued by discounting future cash flows using benchmark yield rates.

The fair values of FCI’s pension plan assets at December 31, 2014 and 2015 are as follows:


	December 31
	2014		2015
	US$		US$
Guaranteed interest contract
Kyobo Life Insurance Co. Ltd.		730		823
Fixed deposit
Industrial Bank of Korea		875		980

		1,605		1,803

Income Taxes

12 Months Ended

Dec. 31, 2015

Income Taxes

13. INCOME TAXES

The components of income tax expense are as follows:


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Current		8,591		15,630		17,338
Deferred		1,181		471		911

Income tax expense		9,772		16,101		18,249

The income (loss) before income taxes for domestic and foreign entities is as follows:


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Domestic		(8,080	)		(12,761	)		(12,037	)
Foreign		45,228			73,329			90,537

		37,148			60,568			78,500

Since the Company is based in the Cayman Islands, a British overseas territory with no corporate income tax, domestic tax on pretax income is calculated at the Cayman Islands statutory rate of zero for each year.

The Company and its subsidiaries file separate income tax returns. A reconciliation of income tax expense on pretax income at statutory rate and income tax expense is shown below:


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Cayman statutory rate		—			—			—
Tax on pretax income at statutory rate		6,788			15,727			18,765
Tax-exempt income		(4,325	)		(2,573	)		(906	)
Permanent differences		1,730			(396	)		(1,065	)
Temporary differences		1,732			(344	)		(330	)
Alternative minimum tax		2,203			1,170			4
Income tax (10%) on undistributed earnings		3,396			2,491			2,460
Net changes in income tax credit		708			(899	)		(897	)
Net changes in valuation allowance of deferred income tax assets		(2,364	)		733			1,621
Net operating loss carryforwards		(189	)		(1,298	)		(2,052	)
Liabilities related to unrealized tax benefits		(39	)		91			672
Adjustment of prior years’ taxes and others		132			1,399			(23	)

Income tax expense		9,772			16,101			18,249

Deferred income tax assets (liabilities) are as follows:


	December 31
	2014			2015
	As Adjusted (Note 2)
	US$			US$
Notes and accounts receivable		141			82
Stock-based compensation		615			544
Allowance for sales return		105			173
Inventory reserve		814			1,478
Foreign currency translation		(1,273	)		(1,949	)
Property and equipment		452			360
Investment tax credits		7,823			8,295
Net operating loss carryforwards		9,621			10,651
Others		14			20
Valuation allowance		(16,791	)		(19,044	)

		1,521			610

The valuation allowance shown in the table above relates to net operating loss carryforwards, tax credits and temporary differences for which the Company believes that realization is uncertain. The change in the valuation allowance was an increase of US$1,075 thousand, an increase of US$515 thousand, and an increase of US$2,253 thousand for the years ended December 31, 2013, 2014, and 2015, respectively. The increase in valuation allowance in 2013, 2014 and 2015 are primarily due to the uncertainty in generating sufficient taxable income in the future and utilization of operating loss carryforwards and research and development credits before they expire. In addition, profits generated from certain products of SMI Taiwan are exempted from income tax for five years beginning January 1, 2010 and January 1, 2012.

As of December 31, 2015, FCI had unused research and development tax credits of approximately US$4,139 thousand which will expire in the period from 2015 to 2019.

As of December 31, 2015, the Company’s United States federal net operating loss carryforwards for federal income tax purposes were approximately US$9,427 thousand. If not utilized, the federal net operating loss carryforwards will expire in 2035.

As of December 31, 2015, the Company’s United States federal and state research and development tax credit carryforwards for federal and state income tax purposes were approximately US$2,444 thousand and US$1,711 thousand, respectively. If not utilized, the federal tax credit carryforwards will expire starting in 2035 while the state tax credit carryforward has no expiration date.

Current United States federal and California state laws include substantial restrictions on the utilization of net operating losses and credits in the event of an “ownership change” of a corporation. Accordingly, the Company’s ability to utilize net operating loss and tax credit carryforwards may be limited as a result of such “ownership change”. Such a limitation could result in the expiration of carryforwards before they are utilized.

As of December 31, 2015, the Company had accumulated undistributed earnings from a foreign subsidiary of US$242 million. No deferred tax liability was recorded in respect of those amounts as these earnings are considered indefinitely reinvested. It is not practicable to estimate the amount of unrecognized deferred tax liabilities for these undistributed foreign earnings.

Unrecognized Tax Benefit

A reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits is as follows:


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Balance, beginning of year		3,520			5,815			4,655
Increases in tax positions taken in current year		2,947			446			2,337
Decrease in tax position taken in prior year primarily related to the resolution of tax audit		(652	)		(1,606	)		(1,353	)

Balance, end of year		5,815			4,655			5,639

At December 31, 2015, the Company had US$5,639 thousand of unrecognized tax benefits that if recognized would affect the effective tax rate. For the years ended December 31, 2013, 2014 and 2015, the total amount of interest expense and penalties related to uncertain tax positions recorded in the provision for income tax expense was approximately US$627 thousand, US$343 thousand and US$363 thousand, respectively. The total amount of accrued interest and penalties recognized as of December 31, 2014 and 2015 was US$1,674 thousand and US$1,977 thousand, respectively. The Company does not expect uncertain tax positions to change in the next twelve months, except in the case of settlements with tax authorities, the likelihood and timing of which are difficult to estimate.

The Company files income tax returns in United States and foreign jurisdictions. The following table summarizes the Company’s major jurisdictions and tax year that remain subject to examination by tax authorities as of December 31, 2015:


Tax Jurisdiction		Tax Years
Hong Kong		2013 and onward
Taiwan		2010 and onward
Korea		2010 and onward
United States		2007 onward

Shareholders' Equity

12 Months Ended

Dec. 31, 2015

Shareholders' Equity

14. SHAREHOLDERS’ EQUITY

Appropriations from Earnings

Pursuant to the laws and regulations of the ROC and the respective Articles of Incorporation, SMI Taiwan, the Company’s largest subsidiary, must make appropriations from annual earnings to non-distributable reserve which could affect the Company’s ability to pay cash or stock dividends, if any. SMI Taiwan subsidiary may only distribute dividends after it has made allowances as determined under ROC GAAP at each year-end for:

Payment of taxes;

Recovery of prior years’ deficits, if any;

10% of remaining balance after deduction for a and b as legal reserve;

Special reserve based on relevant laws or regulations or 10% of remaining balance for deduction from above a to c as special reserve when necessary;

Cash or stock bonus to employees at 0.01% of any remaining earnings after the above reserves have been appropriated, based on a resolution of the board of directors. If bonus to employees is in the form of stock, the bonus may also be appropriated to employees of subsidiaries under the board of directors’ approval;

The existing Articles of Incorporation of SMI Taiwan stipulates to distribute bonus to employees at 0.01% of net income (net of the bonus and remuneration). In accordance with the amendments to the Company Act in May 2015, the recipients of dividends and bonuses are limited to shareholders and do not include employees. The consequential amendments to the Articles of Incorporation of SMI Taiwan will be approved by the SMI Taiwan’s board of directors by June 30, 2016. The proposed amended Articles of Incorporation of SMI Taiwan will stipulate to distribute employees’ compensation and remuneration to directors and supervisors at rates no less than certain percentage or amount and no higher than certain percentage or amount, respectively, of net profit before income tax, employees’ compensation, and remuneration to directors and supervisors.

Dividends

The Company declared cash dividends per ordinary share during the periods presented as follows:


	2014				2015
	Dividends Per Share (US$)		Amount (in US$ thousands)		Dividends Per Share (US$)		Amount (in US$ thousands)
First quarter	$	0.0375	$	5,056	$	0.0375	$	5,156
Second quarter	$	0.0375		5,060	$	0.0375		5,166
Third quarter	$	0.0375		5,081	$	0.0375		5,230
Fourth quarter	$	0.0375		5,084	$	0.0375		5,232

			$	20,281			$	20,784

On November 2, 2015, our Board of Directors, instead of declaring a quarterly dividend, declared an annual dividend of US$0.6 per ADS, equivalent to US$0.15 per ordinary share, which will be paid in four quarterly installments staring the forth quarter of 2015. Future dividends, if any, on the Company’s outstanding ADSs and ordinary shares will be declared by and subject to the discretion of the Company’s board of directors. If the Company’s board of directors decides to distribute dividends, the form, frequency and amount of such dividends will depend upon the Company’s future operations and earnings, capital requirements and surplus, general financial condition, contractual restrictions and other factors our board of directors may deem relevant.

Any future dividend the Company declares will be paid to the holders of ADSs, subject to the terms of the deposit agreement, to the same extent as holders of the Company’s ordinary shares, to the extent permitted by applicable laws and regulations, less the fees and expenses payable under the deposit agreement. Any dividend the Company declares will be distributed by the depositary bank to the holders of our ADSs. Cash dividends on our ordinary shares, if any, will be paid in U.S. dollars.

Treasury Stock

On January 21, 2013, our Board of Directors approved share buyback plans to repurchase up to US$40 million of the Company’s ADSs during the period from January 22, 2013 to January 21, 2014. The program did not obligate the Company to acquire any particular amount of ADS and the program may be modified or suspended at any time at the Company’s discretion. All the treasury stock under this share repurchase program was retired in July 2013.

In the year ended December 31, 2013, the Company repurchased 891 thousand of ADSs for a total cost of US$10.0 million. The weighted average purchase price per ADS repurchased was US$11.24.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
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+ Details

Equity Incentive Plan

12 Months Ended

Dec. 31, 2015

Equity Incentive Plan

15. EQUITY INCENTIVE PLAN

2005 Equity Incentive Plan and 2015 Equity Incentive Plan

On April 22, 2005, the Company adopted its 2005 Equity Incentive Plan (“the 2005 Plan”). The 2005 Plan provides for the grant of stock options, stock bonuses, restricted stock awards, restricted stock units and stock appreciation rights, which may be granted to employees (including officers), directors and consultants. The 2005 Plan reserved 10,000 thousand shares of ordinary shares, inclusive of the number of assumed share options under the 2004 Plan, for issuance upon the exercise of stock options.

In 2006, the Company amended the 2005 Plan to reserve an additional 15,000 thousand ordinary shares for issuance upon exercise of stock options and restricted stock units. In 2009, the Company amended the Plan to reserve an additional 15,000 thousand ordinary shares for issuance upon exercise of stock options and restricted stock units.

Restricted stock units are converted into shares of the Company’s ordinary shares upon vesting on one-for-one basis. The vesting of restricted stock unit is subject to the employee’s continuing service to the Company. The cost of these awards is determined using the fair value of the Company’s ordinary share on the date of the grant, and compensation is recognized on a straight-line basis over the requisite service period. The Company’s restricted stock units are considered non-vested share awards as defined under ASC 718.

In April 2010, the Company’s Board of Directors and Compensation Committee approved an employee stock option exchange program that required certain employees to exchange eligible stock options for a lesser number of new stock options that have approximately the same fair values as the options surrendered. Eligible options included stock options granted between August 17, 2005 and July 31, 2008 that had an exercised price above US$1.85. In 2010, 4,369 thousand eligible stock options were exchanged for 3,785 thousand new stock options granted. The new stock options have an exercise price of US$1.47, which was equal to the market price of the Company’s ordinary share on April 26, 2010, the date eligible stock options were surrendered and new stock options granted. The new stock options were issued under the 2005 Plan and are subject to its terms and conditions. The new stock options will continue to vest according to the original vesting schedule. Using the Black-Scholes option pricing model, the Company determined that the fair value of the surrendered stock options on a grant-by-grant basis was approximately equal, as of the date of the exchange, to the fair value of the new stock options granted, resulting in insignificant incremental share-based compensation.

On June 3, 2015, the Company adopted its 2015 Equity Incentive Plan (“the 2015 Plan”). The 2015 Plan provides for the grant of stock options, stock bonuses, restricted stock awards, restricted stock units and stock appreciation rights, which may be granted to employees (including officers), directors and consultants. The 2015 Plan reserved 20,000 thousand shares of ordinary shares for issuance upon exercise of stock options and restricted stock units.

Stock Option and Restricted Stock Units Activity

The following is a summary of, the 2005 Plan and the 2015 Plan, which includes stock options and restricted stock units:


	Unit (in Thousands)
Available for grant at January 1, 2013		5,336
Restricted stock units granted		(1,893	)
Option and restricted stock units forfeited		123

Available for grant at December 31, 2013		3,566
Restricted stock units granted		(1,923	)
Option and restricted stock units forfeited		44

Available for grant at December 31, 2014		1,687
Authorized		20,000
Restricted stock units granted		(2,000	)
Option and restricted stock units forfeited		175

Available for grant at December 31, 2015		19,862

Stock Options

A summary of the stock option activity and related information is as follows:


	Number of Options Shares (in Thousands)			Weighted Average Exercise Price (US$)		Weighted Average Remaining Contractual Life (Years)
Outstanding at January 1, 2013		1,697			1.47
Options forfeited		—			—
Options exercised		(287	)		1.47

Outstanding at December 31, 2013		1,410			1.47		2.14

Options vested and expected to vest after December 31, 2013		1,410			1.47		2.14
Options forfeited		—			—
Options exercised		(352	)		1.46

Outstanding at December 31, 2014		1,058			1.47		1.35

Options vested and expected to vest after December 31, 2014		1,058			1.47		1.35
Options forfeited		(143	)		1.47
Options exercised		(336	)		1.47

Outstanding at December 31, 2015		579			1.47		0.92

Options vested and expected to vest after December 31, 2015		579			1.47		0.92

Options exercisable at December 31, 2015		579			1.47		0.92

No stock options were granted in 2013, 2014 and 2015. The intrinsic value of options exercised, determined as of the date of option exercise, was US$594, US$1,565 and US$3,688 thousand in 2013, 2014 and 2015, respectively.

As of December 31, 2015, total unrecognized compensation cost related to non-vested share-based compensation awards granted under the Company’s stock option plans, net of estimated forfeitures, was nil.

The aggregate intrinsic value represents the total intrinsic value (the difference between the Company’s closing stock price on the last trading day of fiscal year 2015 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their options on December 31, 2015. Intrinsic value will change in future periods based on the fair market value of the Company’s stock and the number of shares outstanding.

The total cash received from employees as a result of employee stock option exercises were US$422, US$514 and US$494 thousand for the years ended December 31, 2013, 2014 and 2015, respectively.

The related tax effect for stock-based compensation benefit (expense) were US$343 thousand, (US$24) thousand, and US$561 thousand for 2013, 2014 and 2015, respectively. The related tax effect for stock-based compensation expense for option and restricted stock units exercised during 2013, 2014 and 2015 was US$1,599 thousand, US$1,231 thousand and US$1,647 thousand, respectively. The related tax effect was determined using the applicable tax rates in jurisdictions to which this expense relates.

Determining Fair Value

The Company estimated the fair value of each option grant on the date of grant using the Black-Scholes option pricing model. The Black-Scholes option valuation model was developed for estimating the fair value of traded options that have no vesting restrictions and are fully transferable. In addition, the option valuation model requires the input of highly subjective assumptions, including the expected stock price volatility.

Risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. Expected volatilities are determined based on historical volatilities of the stock prices of the Company. Expected life represents the periods that the Company’s share-based awards are expected to be outstanding and was determined based on historical experience regarding similar awards, giving consideration to the contractual term of the share based awards. The dividend yield is zero for the options granted prior to 2013 as the Company has never declared or paid dividends on the ordinary shares or other securities prior to 2013.

Restricted Stock Units

A summary of the status of restricted stock units and changes is as follows:


	Number of Non-vested Stock Units (in Thousands)			Weighted Average Grant Date Fair Value (US$)		Weight Average Remaining Recognition Period (Years)
Non-vested at January 1, 2013		7,018			2.68
Restricted stock units granted		1,893			3.13
Restricted stock units vested		(4,867	)		2.60
Restricted stock units forfeited		(123	)		2.60

Non-vested at December 31, 2013		3,921			2.90		0.43
Restricted stock units granted		1,923			5.13
Restricted stock units vested		(3,640	)		2.96
Restricted stock units forfeited		(44	)		4.92

Non-vested at December 31, 2014		2,160			4.90		0.31
Restricted stock units granted		2,000			6.83
Restricted stock units vested		(2,003	)		4.96
Restricted stock units forfeited		(32	)		5.85

Non-vested at December 31, 2015		2,125			6.65		0.73

As of December 31, 2015, there was US$5,112 thousand of total unrecognized compensation cost related to restricted stock units granted under the 2005 Plan and the 2015 Plan.

Stock-based Compensation Expense

The following table shows total stock-based compensation expense included in the Consolidated Statements of Income for the years ended December 31, 2013, 2014 and 2015.


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Cost of sales		308		282		261
Research and development		6,351		6,773		6,565
Sales and marketing		2,197		1,746		1,790
General and administrative		1,406		1,546		1,802

		10,262		10,347		10,418

Commitments and Contingencies

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies

16. COMMITMENTS AND CONTINGENCIES

FCI provided their employees with collateral for personal loans which is deposited at a designated bank and the amount deposited was US$455 thousand and US$425 thousand at December 31, 2014 and 2015, respectively. Such amounts were accounted for as restricted cash.

Operating Leases

The Company entered into various operating lease agreements for office space that expire on various dates through April 2019. The Company recognized rent expense for the years ended December 31, 2013, 2014 and 2015 of US$1,763 thousand, US$1,981 thousand and US$2,453 thousand, respectively. The minimum operating lease payments expected under these leases as of December 31, 2015 were US$1,771 thousand, US$786 thousand, US$580 thousand, US$184 thousand, and nil for the years ending December 31, 2016, 2017, 2018, 2019 and 2020, respectively.

Litigation

The Company is subject to legal proceedings and claims, either asserted or unasserted, which arise in the ordinary course of business. Although the outcome of such proceedings and claims cannot be predicted with certainty, management does not believe that the outcome of any of these matters will have a material adverse effect on our business, results of operations, financial position or cash flows. Any litigation, however, involves potential risk and potentially significant litigation costs, and therefore there can be no assurance that any litigation which is now pending or which may arise in the future would not have such a material adverse effect on our business, financial position, results of operations or cash flows.

All American Semiconductor, Inc. (“All American” or “AASI”) was a former distributor for the Company. On April 25, 2007, All American filed for Chapter 11 bankruptcy protection. At the time of the filing, the Company had US$256 thousand of unpaid accounts receivable from All American. On April 17, 2009, SMI USA and related entities were named as defendants in an adversary proceeding filed by the AASI Creditor Liquidating Trust (“CLT”) in the bankruptcy case pending in the U.S. Bankruptcy Court for the Southern District of Florida. The CLT was seeking the return of allegedly avoidable transfers in the amount of US$854 thousand. The Company filed answer and affirmative defenses. In March 2010, SMI USA settled with the CLT by paying the amount of US$220 thousand and on April 1, 2010, the Bankruptcy Court granted the motion to approve stipulations to compromise controversy. On August 23, 2010, the Court entered an order dismissing the adversary proceeding. In June 2011, Liquidating Trustee for the CLT filed the AASI Creditor Liquidating Trustee’s Seventeenth Omnibus Objection to Claims but in August 2011, withdrew it with respect to SMI USA’s proof of claim. According to the CLT’s letter dated September 9, 2011, it was finalizing its claims review process and preparing for distribution to beneficiaries who are holders of allowed claims and have rights to a distribution pursuant to the bankruptcy plan. In January 2012, January 2014, December 2014, July 2015 and October 2015, the Company received distributions of US$21 thousand, US$36 thousand, US$12 thousand, US$51 thousand and US$31 thousand, respectively. On March 29, 2016, we received a final distribution of US$112 thousand.

In 2006, FCI joined with other technology companies and invested in the Pangyo Silicon Park Construction Project Cooperative (“Pangyo Cooperative”) in Korea. In July 2010, FCI, TLi Inc. (“TLI”), OCI Materials Co., Ltd (“OCI”) and other companies withdrew from the Pangyo Cooperative and forfeited 10% of their total investment. FCI believes its loss was caused by bad will actions taken by TLI. In December 2011, FCI and OCI together filed a complaint against TLI at the Suwon District Court in Korea. In April 2013, the court dismissed the plaintiffs’ complaints. The plaintiffs have decided not to appeal the court’s decision.

Segment Information

12 Months Ended

Dec. 31, 2015

Segment Information

17. SEGMENT INFORMATION

The Company designs, develops and markets high performance, low-power semiconductor products for the multimedia consumer electronics market. The Company currently operates as one reportable segment. The chief operating decision maker is the Chief Executive Officer.

The Company groups its products into three categories, based on the markets in which they may be used. The following summarizes the Company’s revenue by product category:


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Mobile Storage		185,488		241,614		302,910
Mobile Communications		31,022		40,034		50,896
Others		8,798		7,675		7,491

		225,308		289,323		361,297

Revenue is attributed to a geographic area based on the bill-to location. The following summarizes the Company’s revenue by geographic area:


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Taiwan		47,653		57,244		71,387
United States		22,528		26,265		39,558
Japan		3,936		11,180		19,636
Korea		115,287		150,557		150,118
China		29,129		35,008		69,623
Others		6,775		9,069		10,975

		225,308		289,323		361,297

Major customers representing at least 10% of net sales


	Year Ended December 31
	2013				2014				2015
	US$		%		US$		%		US$		%
SK Hynix		67,977		30		107,227		37		108,645		30
Samsung		36,037		16		30,065		10		*		*

*	Less than 10%

Long-lived assets (property and equipment, net) by geographic area were as follows:


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Taiwan		24,066		28,739		32,014
United States		54		142		274
Korea		1,773		2,477		1,891
China		4,266		4,163		16,268
Japan		36		16		22

		30,195		35,537		50,469

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8971-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8595-108599

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599

+ Details

Fair Value Measurement

12 Months Ended

Dec. 31, 2015

Fair Value Measurement

18. FAIR VALUE MEASUREMENT

The following section describes the valuation methodologies the Company uses to measure assets and liabilities at fair value.

The Company uses quoted prices in active markets for identical assets to determine fair value where applicable. This pricing methodology applies to Level 1 investments such as bond funds. For the years ended December 31, 2014 and 2015, none of the Company’s assets measured on a recurring basis was determined by using significant unobservable inputs.

The following table presents our assets measured at fair value on a recurring basis as of December 31, 2014 and 2015:

December 31, 2014

Level 1

Level 2

Level 3

Total

US$

Assets

Short-term investments — trading bond funds

703

—

703

December 31, 2015

Level 1

Level 2

Level 3

Total

US$

Assets

Short-term investments — trading bond funds

681

—

681

The carrying amount of the held-to-maturity investments purchased in July 2015 that will be matured in July 2016 approximates their fair value due to the short-term maturity of the investments.

Those assets required to be measured at fair value on a nonrecurring basis were nil during the years ended December 31, 2013, 2014 and 2015 and please refer to Note 2, “Summary of Significant Accounting Policy” and Note 10, “Goodwill and Acquired Intangible Assets” for the significant assumption were used.

The Company reviews the carrying values of financial assets carried at cost when impairment indicators are present. The fair values of assets without quoted market price are determined based on management judgment with the best available information. Any impairment charge determined is based on the difference between the Company’s carrying value and the proportionate ownership of the investee’s net assets at year end.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2015

Basis of Presentation

Basis of Presentation

Use of Estimates

Use of Estimates

Concentration of Credit Risk

Concentration of Credit Risk

Fair Value of Financial Instruments

Fair Value of Financial Instruments

Level 1 — Use unadjusted quoted prices in active markets for identical assets or liabilities.

Level 3 — Use inputs that are generally unobservable and reflect the use of significant management judgments and estimates.

See Note 18, “Fair Value Measurement”, for the related disclosure.

Cash Equivalents

Cash Equivalents

The Company considers all highly liquid investments to be cash equivalents.

Short-term Investments

Short-term Investments

Allowance for Doubtful Receivables

Allowance for Doubtful Receivables

Inventories

Inventories

Long-term Investments

Long-term Investments

Property and Equipment

Property and Equipment

Property and equipment are stated at cost less accumulated depreciation. Significant additions, renewals and betterments are capitalized, while maintenance and repairs are expensed as incurred.

Government Grants

Government Grants

Goodwill and Intangible Assets

Goodwill and Intangible Assets

Impairment of Goodwill and Long-Lived Assets

Impairment of Goodwill and Long-Lived Assets

Other Assets

Other Assets

Other assets primarily consist of industrial property right and deposits for office leases.

Restricted Assets

Restricted Assets

Other Long-Term Liabilities

Other long-term liabilities

Other long-term liabilities primarily consist of payable to former shareholders of Shannon Systems and unrecognized tax benefit.

Pension Costs

Pension Costs

Revenue Recognition

Revenue Recognition

Research and Development

Research and Development

Income Taxes

Income Taxes

Foreign Currency Transactions

Foreign Currency Transactions

Translation of Foreign Currency Financial Statements

Translation of Foreign Currency Financial Statements

Comprehensive Income (Loss)

Comprehensive Income (Loss)


	Year Ended December 31, 2013							Year Ended December 31, 2014									Year Ended December 31, 2015
	US$							US$									US$
	Foreign currency items		Defined benefit pension plans			Accumulated other comprehensive income (loss)		Foreign currency items			Defined benefit pension plans			Accumulated other comprehensive income (loss)			Foreign currency items			Defined benefit pension plans			Accumulated other comprehensive income (loss)
Beginning balance		3,923		(258	)		3,665		4,556			(461	)		4,095			3,354			(849	)		2,505
Current-period change		633		(203	)		430		(1,202	)		(388	)		(1,590	)		(1,868	)		(4	)		(1,872	)

Ending balance		4,556		(461	)		4,095		3,354			(849	)		2,505			1,486			(853	)		633

Legal Contingencies

Legal Contingencies

Earnings Per Share

Earnings Per Share

Stock-Based Compensation

Stock-Based Compensation

Treasury Stock

Treasury Stock

Treasury stock is stated at cost and shown as a reduction to shareholders’ equity.

Dividends

Dividends

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Components of Accumulated Other Comprehensive Income (Loss)

The following table presents the components of accumulated other comprehensive income (loss) as of December 31, 2013, 2014 and 2015:


	Year Ended December 31, 2013							Year Ended December 31, 2014									Year Ended December 31, 2015
	US$							US$									US$
	Foreign currency items		Defined benefit pension plans			Accumulated other comprehensive income (loss)		Foreign currency items			Defined benefit pension plans			Accumulated other comprehensive income (loss)			Foreign currency items			Defined benefit pension plans			Accumulated other comprehensive income (loss)
Beginning balance		3,923		(258	)		3,665		4,556			(461	)		4,095			3,354			(849	)		2,505
Current-period change		633		(203	)		430		(1,202	)		(388	)		(1,590	)		(1,868	)		(4	)		(1,872	)

Ending balance		4,556		(461	)		4,095		3,354			(849	)		2,505			1,486			(853	)		633

Business Acquisition (Tables)

12 Months Ended

Dec. 31, 2015

Estimated Fair Values of Assets Acquired and Liabilities Assumed

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the date of acquisition:


	US$
Cash and cash equivalents		1,903
Accounts receivable, net		946
Inventories		2,624
Other current assets		289
Property and equipment		71
Goodwill		33,204
Identifiable intangible assets		8,381
Accounts payable		(644	)
Accrued expenses and other current liabilities		(1,209	)

Net assets acquired		45,565

Identifiable Intangible Assets and Useful Lives

The identifiable intangible assets and respective useful lives are as follows:


	US$		Useful Life
Developed technology		3,789		3.5
In-process research and development (“IPR&D”)		4,592		indefinite

Total identifiable intangible assets		8,381

Results of Shannon Included on Consolidated Statement of Income

The results of Shannon Systems since the acquisition date included on the consolidated statement of income for the year ended December 31, 2015 were as follows:


	US$
Net sales		9,049
Net income		421

Unaudited Proforma Information of Summary of Results of Operations

The following unaudited pro forma information represents a summary of the results of operations as if the acquisition occurred on January 1, 2014 and 2015 and includes certain pro forma adjustments, including amortization of identifiable intangibles from that date (in thousands except earnings per share):


	Year Ended December 31
	2014		2015
Net sales		293,562		364,670
Net income		42,483		58,468
Earnings per share
Basic		0.31		0.42
Diluted		0.31		0.42
Weighted average ordinary shares outstanding (thousand)
Basic		136,164		138,880
Diluted		138,347		140,414

Cash And Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2015

Details of Cash and Cash Equivalents


	December 31
	2014		2015
	US$		US$
Cash and deposits in bank		38,851		28,780
Time deposits		155,360		151,739

		194,211		180,519

Short-Term Investments (Tables)

12 Months Ended

Dec. 31, 2015

Short Term Investments

	December 31
		2014		2015
		US$		US$
Trading securities			703		681
Held-to-maturity investments			—		4,000

			703		4,681

Notes and Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2015

Summary of Notes and Accounts Receivable


	December 31
	2014			2015
	US$			US$
Notes receivable		192			16
Trade accounts receivable		31,256			61,293

		31,448			61,309
Allowance for doubtful accounts		(1,167	)		(775	)
Allowance for sales returns and discounts		(1,427	)		(1,555	)

		28,854			58,979

Changes in Allowances

The changes in the allowances are summarized as follows:


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Allowances for doubtful accounts
Balance, beginning of year		1,634			1,275			1,167
Reversals charged to expense, net		(359	)		(108	)		(392	)
Write-offs		—			—			—

Balance, end of year		1,275			1,167			775


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Allowances for sales returns and discounts
Balance, beginning of year		1,919			1,059			1,427
Additions charged to expense, net		1,320			1,600			1,753
Actual sales return and discount		(2,180	)		(1,232	)		(1,625	)

Balance, end of year		1,059			1,427			1,555

Inventories (Tables)

12 Months Ended

Dec. 31, 2015

Components of Inventory

The components of inventories are as follows:


	December 31
	2014		2015
	US$		US$
Finished goods		9,787		13,860
Work in process		20,835		21,201
Raw materials		13,454		12,049

		44,076		47,110

Long-Term Investments (Tables)

12 Months Ended

Dec. 31, 2015

Equity Investments with Carrying Value

As of December 31, 2014 and 2015, the Company held equity investments in several privately-held companies with the carrying value as follows:


	Percentage of Ownership						December 31
	2014			2015			2014		2015
							US$		US$
Cost method:
Cashido Corp. (Cashido)		2.1	%		2.1	%		104		104
Vastview Technology, Corp. (Vastview)		2.9	%		2.9	%		29		29

								133		133

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

Property and Equipment

December 31
	2014		2015
	US$		US$
Cost:
Land		8,058		8,813
Buildings		19,813		21,254
Machinery and equipment		13,443		15,995
Furniture and fixtures		5,131		6,446
Leasehold and buildings improvement		4,229		4,656
Software		29,796		17,505

Total		80,470		74,669

Accumulated depreciation:
Buildings		2,240		2,648
Machinery and equipment		10,573		11,983
Furniture and fixtures		3,492		3,980
Leasehold and buildings improvement		3,064		3,358
Software		25,807		14,421

		45,176		36,390
Prepayment and construction in progress		243		12,190

		35,537		50,469

Goodwill and Acquired Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Intangible Assets Acquired from Acquisition

The intangible assets acquired from the Company’s acquisition of FCI and Centronix in 2007 and Shannon Systems in 2015 are as follows:


	December 31
	2014										2015
	US$										US$
	Cost		Accumulated Impairment			Accumulated Amortization			Net Carrying Amount		Cost		Accumulated Impairment			Accumulated Amortization			Net Carrying Amount
Core technology		15,809		(4,474	)		(11,335	)		—		15,809		(4,474	)		(11,335	)		—
Customer relationship		8,325		—			(8,325	)		—		8,325		—			(8,325	)		—
Order backlog		1,243		—			(1,243	)		—		1,243		—			(1,243	)		—
Developed technology		—		—			—			—		8,381		—			(1,051	)		7,330

Total		25,377		(4,474	)		(20,903	)		—		33,758		(4,474	)		(21,954	)		7,330

Carrying Value of Goodwill


	December 31
	2014										2015
	US$										US$
	Cost		Accumulated Impairment			Foreign Currency Adjustment			Net Carrying Amount		Cost		Accumulated Impairment			Foreign Currency Adjustment			Net Carrying Amount
Goodwill		66,300		(30,808	)		(25	)		35,467		99,504		(30,808	)		(36	)		68,660

Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Accrued Expenses and Other Current Liabilities


	December 31
	2014		2015
	US$		US$
Wages and bonus		12,093		20,365
Dividends		153		15,839
Research and development payable		2,468		2,953
License fees and royalties		2,982		4,173
Professional fees		1,714		2,126
Equipment		1,170		1,285
Others		3,066		5,340

		23,646		52,081

Pension Plan (Tables)

12 Months Ended

Dec. 31, 2015

Change in Benefits Obligation and Plan Assets and Reconciliation of Funded Status

The changes in benefits obligation and plan assets and the reconciliation of funded status are as follows:


	December 31
	2013			2014			2015
	US$			US$			US$
Change in benefit obligation
Projected benefit obligation at beginning of year		1,897			2,098			3,320
Service cost		440			437			273
Interest cost		58			58			57
Actuarial loss(gain)		(202	)		814			79
Benefits paid		(95	)		(87	)		(97	)

Projected benefit obligation at end of year		2,098			3,320			3,632

Change in plan assets
Fair value of plan assets at beginning of year		1,925			2,319			2,556
Actual return on plan assets		43			31			33
Employer contributions		433			282			328
Benefits paid		(82	)		(76	)		(117	)

Fair value of plan assets at end of year		2,319			2,556			2,800

Funded status recognized as an other asset (liabilities)		221			(764	)		(832	)

Amounts Recognized in Accumulated Other Comprehensive Income

Amounts recognized in accumulated other comprehensive income consist of the following:


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Net loss		460		848		852
Transition obligation		1		1		1

Total recognized in accumulated other comprehensive income		461		849		853

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost are as follows:


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Service cost		440			437			273
Interest cost		58			58			57
Projected return on plan assets		(47	)		(51	)		(47	)
Amortization of unrecognized net transition obligation and unrecognized net actuarial gain		(3	)		(19	)		27

Net periodic benefit cost		448			425			310

Other Changes in Plan Assets And Benefit Obligation Recognized In Other Comprehensive Loss

Other changes in plan assets and benefit obligation recognized in other comprehensive loss:


	2013		2014		2015
	US$		US$		US$
Recognize the decrease in net gain		203		388		4
Amortization of net gain		—		—		—

Total recognized in other comprehensive loss		203		388		4

Expected Benefit Payments

Expected benefit payments:


	US$
2016		146
2017		290
2018		175
2019		140
2020		120
2021 and thereafter		748

Actuarial Assumptions to Determine Benefit Obligations

The actuarial assumptions to determine the benefit obligations were as follows:


	2013						2014						2015
	Taiwan			Korea			Taiwan			Korea			Taiwan			Korea
Weighted-average assumptions used to determine benefit obligations:
Discount rate		1.88	%		5.20	%		2.00	%		4.10	%		1.75	%		3.90	%
Rate of compensation increase		4.25	%		2.60	%		4.25	%		5.00	%		4.25	%		4.00	%
Weighted-average assumptions used to determine net projected benefit cost:
Discount rate		1.88	%		5.20	%		2.00	%		4.10	%		1.75	%		3.90	%
Expected long-term return on plan assets		2.00	%		3.00	%		2.00	%		2.00	%		2.00	%		1.20	%
Rate of compensation increase		4.25	%		2.60	%		4.25	%		5.00	%		4.25	%		4.00	%

Fair Values Of FCI's Pension Plan Assets

The fair values of FCI’s pension plan assets at December 31, 2014 and 2015 are as follows:


	December 31
	2014		2015
	US$		US$
Guaranteed interest contract
Kyobo Life Insurance Co. Ltd.		730		823
Fixed deposit
Industrial Bank of Korea		875		980

		1,605		1,803

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Components of Income Tax Expense

The components of income tax expense are as follows:


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Current		8,591		15,630		17,338
Deferred		1,181		471		911

Income tax expense		9,772		16,101		18,249

Income (Loss) Before Income Taxes for Domestic and Foreign Entities

The income (loss) before income taxes for domestic and foreign entities is as follows:


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Domestic		(8,080	)		(12,761	)		(12,037	)
Foreign		45,228			73,329			90,537

		37,148			60,568			78,500

Reconciliation of Income Tax Expense on Pretax Income at Statutory Rate and Income Tax Expense

The Company and its subsidiaries file separate income tax returns. A reconciliation of income tax expense on pretax income at statutory rate and income tax expense is shown below:


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Cayman statutory rate		—			—			—
Tax on pretax income at statutory rate		6,788			15,727			18,765
Tax-exempt income		(4,325	)		(2,573	)		(906	)
Permanent differences		1,730			(396	)		(1,065	)
Temporary differences		1,732			(344	)		(330	)
Alternative minimum tax		2,203			1,170			4
Income tax (10%) on undistributed earnings		3,396			2,491			2,460
Net changes in income tax credit		708			(899	)		(897	)
Net changes in valuation allowance of deferred income tax assets		(2,364	)		733			1,621
Net operating loss carryforwards		(189	)		(1,298	)		(2,052	)
Liabilities related to unrealized tax benefits		(39	)		91			672
Adjustment of prior years’ taxes and others		132			1,399			(23	)

Income tax expense		9,772			16,101			18,249

Deferred Income Tax Assets (Liabilities)

Deferred income tax assets (liabilities) are as follows:


	December 31
	2014			2015
	As Adjusted (Note 2)
	US$			US$
Notes and accounts receivable		141			82
Stock-based compensation		615			544
Allowance for sales return		105			173
Inventory reserve		814			1,478
Foreign currency translation		(1,273	)		(1,949	)
Property and equipment		452			360
Investment tax credits		7,823			8,295
Net operating loss carryforwards		9,621			10,651
Others		14			20
Valuation allowance		(16,791	)		(19,044	)

		1,521			610

Reconciliation of Unrecognized Tax Benefits

A reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits is as follows:


	Year Ended December 31
	2013			2014			2015
	US$			US$			US$
Balance, beginning of year		3,520			5,815			4,655
Increases in tax positions taken in current year		2,947			446			2,337
Decrease in tax position taken in prior year primarily related to the resolution of tax audit		(652	)		(1,606	)		(1,353	)

Balance, end of year		5,815			4,655			5,639

Summary of Major Jurisdictions and Tax Year Subject to Examination by Tax Authorities

The following table summarizes the Company’s major jurisdictions and tax year that remain subject to examination by tax authorities as of December 31, 2015:


Tax Jurisdiction		Tax Years
Hong Kong		2013 and onward
Taiwan		2010 and onward
Korea		2010 and onward
United States		2007 onward

Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Cash Dividends Declared Per Ordinary Share

The Company declared cash dividends per ordinary share during the periods presented as follows:


	2014				2015
	Dividends Per Share (US$)		Amount (in US$ thousands)		Dividends Per Share (US$)		Amount (in US$ thousands)
First quarter	$	0.0375	$	5,056	$	0.0375	$	5,156
Second quarter	$	0.0375		5,060	$	0.0375		5,166
Third quarter	$	0.0375		5,081	$	0.0375		5,230
Fourth quarter	$	0.0375		5,084	$	0.0375		5,232

			$	20,281			$	20,784

Equity Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2015

Summary of Plan Includes Stock Options and Restricted Stock Units

The following is a summary of, the 2005 Plan and the 2015 Plan, which includes stock options and restricted stock units:


	Unit (in Thousands)
Available for grant at January 1, 2013		5,336
Restricted stock units granted		(1,893	)
Option and restricted stock units forfeited		123

Available for grant at December 31, 2013		3,566
Restricted stock units granted		(1,923	)
Option and restricted stock units forfeited		44

Available for grant at December 31, 2014		1,687
Authorized		20,000
Restricted stock units granted		(2,000	)
Option and restricted stock units forfeited		175

Available for grant at December 31, 2015		19,862

Summary of Stock Option Activity

A summary of the stock option activity and related information is as follows:


	Number of Options Shares (in Thousands)			Weighted Average Exercise Price (US$)		Weighted Average Remaining Contractual Life (Years)
Outstanding at January 1, 2013		1,697			1.47
Options forfeited		—			—
Options exercised		(287	)		1.47

Outstanding at December 31, 2013		1,410			1.47		2.14

Options vested and expected to vest after December 31, 2013		1,410			1.47		2.14
Options forfeited		—			—
Options exercised		(352	)		1.46

Outstanding at December 31, 2014		1,058			1.47		1.35

Options vested and expected to vest after December 31, 2014		1,058			1.47		1.35
Options forfeited		(143	)		1.47
Options exercised		(336	)		1.47

Outstanding at December 31, 2015		579			1.47		0.92

Options vested and expected to vest after December 31, 2015		579			1.47		0.92

Options exercisable at December 31, 2015		579			1.47		0.92

Summary of Restricted Stock Units and Changes

A summary of the status of restricted stock units and changes is as follows:


	Number of Non-vested Stock Units (in Thousands)			Weighted Average Grant Date Fair Value (US$)		Weight Average Remaining Recognition Period (Years)
Non-vested at January 1, 2013		7,018			2.68
Restricted stock units granted		1,893			3.13
Restricted stock units vested		(4,867	)		2.60
Restricted stock units forfeited		(123	)		2.60

Non-vested at December 31, 2013		3,921			2.90		0.43
Restricted stock units granted		1,923			5.13
Restricted stock units vested		(3,640	)		2.96
Restricted stock units forfeited		(44	)		4.92

Non-vested at December 31, 2014		2,160			4.90		0.31
Restricted stock units granted		2,000			6.83
Restricted stock units vested		(2,003	)		4.96
Restricted stock units forfeited		(32	)		5.85

Non-vested at December 31, 2015		2,125			6.65		0.73

Stock-based Compensation Expense

The following table shows total stock-based compensation expense included in the Consolidated Statements of Income for the years ended December 31, 2013, 2014 and 2015.


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Cost of sales		308		282		261
Research and development		6,351		6,773		6,565
Sales and marketing		2,197		1,746		1,790
General and administrative		1,406		1,546		1,802

		10,262		10,347		10,418

Segment Information (Tables)

12 Months Ended

Dec. 31, 2015

Long-Lived Assets (Property and Equipment, Net) by Geographic Area

Long-lived assets (property and equipment, net) by geographic area were as follows:


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Taiwan		24,066		28,739		32,014
United States		54		142		274
Korea		1,773		2,477		1,891
China		4,266		4,163		16,268
Japan		36		16		22

		30,195		35,537		50,469

Customer Lists

Net Sales

Major customers representing at least 10% of net sales


	Year Ended December 31
	2013				2014				2015
	US$		%		US$		%		US$		%
SK Hynix		67,977		30		107,227		37		108,645		30
Samsung		36,037		16		30,065		10		*		*

*	Less than 10%

Product

Net Sales

The following summarizes the Company’s revenue by product category:


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Mobile Storage		185,488		241,614		302,910
Mobile Communications		31,022		40,034		50,896
Others		8,798		7,675		7,491

		225,308		289,323		361,297

Country

Net Sales

The following summarizes the Company’s revenue by geographic area:


	Year Ended December 31
	2013		2014		2015
	US$		US$		US$
Taiwan		47,653		57,244		71,387
United States		22,528		26,265		39,558
Japan		3,936		11,180		19,636
Korea		115,287		150,557		150,118
China		29,129		35,008		69,623
Others		6,775		9,069		10,975

		225,308		289,323		361,297

Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2015

Assets Measured at Fair Value on Recurring Basis

The following table presents our assets measured at fair value on a recurring basis as of December 31, 2014 and 2015:

December 31, 2014

Level 1

Level 2

Level 3

Total

US$

Assets

Short-term investments — trading bond funds

703

—

703

December 31, 2015

Level 1

Level 2

Level 3

Total

US$

Assets

Short-term investments — trading bond funds

681

—

681

Summary Of Significant Accounting Policies - Additional Information (Detail) shares in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Customer shares	Dec. 31, 2015 TWD ($) Customer shares	Dec. 31, 2014 USD ($) Customer shares	Dec. 31, 2013 USD ($) Customer shares	Dec. 31, 2012 TWD ($)
Significant Accounting Policies [Line Items]
Consolidated interest acquire in subsidiary	100.00%	100.00%
Top ten customer sales in percentage	72.00%	72.00%	76.00%	76.00%
Number of customers accounted for 10% or more sales \| Customer	1	1	2	2
Depreciation and amortization	$ 7,936		$ 6,917	$ 6,429
Warranty period for manufacturing defects of products	1 year	1 year
Evaluation of tax benefits realized upon settlement	50.00%	50.00%
Income tax under IBT act effective date	Jan. 01, 2006	Jan. 01, 2006
Minimum alternative tax on income under IBT act	10.00%	10.00%
Standard deduction tax amount					$ 1,000
Standard deduction tax rate					10.00%
Deferred income tax liabilities, noncurrent	$ 0
Deferred income tax assets, net	$ 610		1,521
Scenario, Previously Reported
Significant Accounting Policies [Line Items]
Deferred income tax assets, noncurrent			1,909
Deferred income tax liabilities, current			388
Scenario, Adjustment
Significant Accounting Policies [Line Items]
Deferred income tax liabilities, noncurrent			$ 388
Customers accounted for 10% or more \| Net sales
Significant Accounting Policies [Line Items]
Major customers percentage of net sales	30.00%	30.00%	47.00%	46.00%
Amended in August 2012
Significant Accounting Policies [Line Items]
Standard deduction tax amount		$ 500
Standard deduction tax rate	12.00%	12.00%
Amendment Effective Date	Jan. 01, 2013	Jan. 01, 2013
Minimum
Significant Accounting Policies [Line Items]
Short term investment maturity period	3 months	3 months
Maximum
Significant Accounting Policies [Line Items]
Short term investment maturity period	1 year	1 year
Held-to-maturity investment maturity period	1 year	1 year
American Depositary Shares
Significant Accounting Policies [Line Items]
The effect of dilutive securities of employee stock options and restricted stock units \| shares	384	384	546	577
Ordinary Shares
Significant Accounting Policies [Line Items]
The effect of dilutive securities of employee stock options and restricted stock units \| shares	1,534	1,534	2,183	2,308
Software \| Minimum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	1 year	1 year
Software \| Maximum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	5 years	5 years
Development technology \| Minimum
Significant Accounting Policies [Line Items]
Intangible asset amortized over estimated useful lives	3 years 6 months	3 years 6 months
Development technology \| Maximum
Significant Accounting Policies [Line Items]
Intangible asset amortized over estimated useful lives	4 years 6 months	4 years 6 months
Buildings \| Minimum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	25 years	25 years
Buildings \| Maximum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	50 years	50 years
Machinery and Equipment \| Minimum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	3 years	3 years
Machinery and Equipment \| Maximum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	6 years	6 years
Furniture and Fixtures \| Minimum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	3 years	3 years
Furniture and Fixtures \| Maximum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	8 years	8 years
Leasehold And Building Improvement \| Minimum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	2 years	2 years
Leasehold And Building Improvement \| Maximum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful life	6 years	6 years
FCI
Significant Accounting Policies [Line Items]
Consolidated interest acquire in subsidiary	99.90%	99.90%

Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, Foreign currency items	$ 3,354	$ 4,556	$ 3,923
Current-period change, Foreign currency items	(1,868)	(1,202)	633
Ending balance, Foreign currency items	1,486	3,354	4,556
Beginning balance, Defined benefit pension plans	(849)	(461)	(258)
Current-period change, Defined benefit pension plans	(4)	(388)	(203)
Ending balance, Defined benefit pension plans	(853)	(849)	(461)
Beginning balance, Accumulated other comprehensive income (loss)	2,505	4,095	3,665
Current-period change, Accumulated other comprehensive income (loss)	(1,872)	(1,590)	430
Ending balance, Accumulated other comprehensive income (loss)	$ 633	$ 2,505	$ 4,095

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details

Business Acquisition - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
	Jul. 01, 2015	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Consolidated interest acquire in subsidiary		100.00%
Other long-term liabilities		$ 12,765	$ 6,084
Shannon Systems
Business Acquisition [Line Items]
Consolidated interest acquire in subsidiary	100.00%
Business acquisition shares issued, shares	1,560
Business acquisition shares issued, value	$ 7,640
Business acquisition, cash paid to acquire interest		37,925
Business acquisition costs		359
Shannon Systems \| Other Noncurrent Liabilities
Business Acquisition [Line Items]
Other long-term liabilities		$ 5,735

Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Jul. 01, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 68,660		$ 35,467
Shannon Systems
Business Acquisition [Line Items]
Cash and cash equivalents		$ 1,903
Accounts receivable, net		946
Inventories		2,624
Other current assets		289
Property and equipment		71
Goodwill		33,204
Identifiable intangible assets		8,381
Accounts payable		(644)
Accrued expenses and other current liabilities		(1,209)
Net assets acquired		$ 45,565

Identifiable Intangible Assets and Useful Lives (Detail) - Shannon Systems $ in Thousands	Jul. 01, 2015 USD ($)
Schedule of Finite Lived and Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]
Developed technology	$ 3,789
In-process research and development ("IPR&D")	4,592
Total identifiable intangible assets	$ 8,381
Developed technology	3 years 6 months
In-process research and development ("IPR&D")	indefinite

Results of Shannon Included on Consolidated Statement of Income (Detail) - Shannon Systems $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Business Acquisition Information [Line Items]
Net sales	$ 9,049
Net income	$ 421

Unaudited Proforma Information of Summary of Results of Operations (Detail) - Shannon Systems - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net sales	$ 364,670	$ 293,562
Net income	$ 58,468	$ 42,483
Earnings per share
Basic	$ 0.42	$ 0.31
Diluted	$ 0.42	$ 0.31
Weighted average ordinary shares outstanding (thousand)
Basic	138,880	136,164
Diluted	140,414	138,347

Details of Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash and Cash Equivalents [Line Items]
Cash and deposits in bank	$ 28,780	$ 38,851
Time deposits	151,739	155,360
Cash and Cash Equivalents, at Carrying Value	$ 180,519	$ 194,211	$ 161,720	$ 154,734

Short Term Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]
Senior notes coupon rate	$ 681	$ 703
Held-to-maturity investments	4,000
Short-term investments	$ 4,681	$ 703

Short Term Investments - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gain (Loss) on Investments [Line Items]
Realized gains on sales of short-term investments, trading securities		$ 3	$ 4	$ 4
Unrealized holding loss on short-term investment		$ 0	0	$ 0
Gain on structured notes			$ 118
Senior Notes
Gain (Loss) on Investments [Line Items]
Senior notes coupon rate	1.65%
Effective interest rate	1.65%
Par value	$ 4,000
Investment maturity date	2016-07	2016-07

Summary of Notes and Accounts Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts and Other Receivables [Line Items]
Notes receivable	$ 16	$ 192
Trade accounts receivable	61,293	31,256
Trade Accounts And Notes Receivable Gross Current	61,309	31,448
Allowance for doubtful accounts	(775)	(1,167)	$ (1,275)	$ (1,634)
Allowance for sales returns and discounts	(1,555)	(1,427)	$ (1,059)	$ (1,919)
Notes and accounts receivable, net	$ 58,979	$ 28,854

Change in Allowances (Detail) - USD ($) $ in Thousands	12 Months Ended
Change in Allowances (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowances for doubtful accounts
Balance, beginning of year	$ 1,167	$ 1,275	$ 1,634
Reversals charged to expense, net	(392)	(108)	(359)
Write-offs	0	0	0
Balance, end of year	775	1,167	1,275
Allowances for sales returns and discounts
Balance, beginning of year	1,427	1,059	1,919
Additions charged to expense, net	1,753	1,600	1,320
Actual sales return and discount	(1,625)	(1,232)	(2,180)
Balance, end of year	$ 1,555	$ 1,427	$ 1,059

Components of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Inventory [Line Items]
Finished goods	$ 13,860	$ 9,787
Work in process	21,201	20,835
Raw materials	12,049	13,454
Inventory, Net	$ 47,110	$ 44,076

Inventories - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Inventory [Line Items]
Inventory written down	$ 2,525	$ 4,561	$ 2,503

Equity Investments with Carrying Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Cost-method Investments [Line Items]
Long-term investments	$ 133	$ 133
Cashido Corp. (Cashido)
Schedule of Cost-method Investments [Line Items]
Long-term investments	$ 104	$ 104
Equity Investments Percentage of Ownership	2.10%	2.10%
Vastview Technology, Corp. (Vastview)
Schedule of Cost-method Investments [Line Items]
Long-term investments	$ 29	$ 29
Equity Investments Percentage of Ownership	2.90%	2.90%

Long-term Investment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended				36 Months Ended	48 Months Ended
	Feb. 28, 2007	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2009	Dec. 31, 2010	Dec. 31, 2014
Schedule of Cost-method Investments [Line Items]
Cost method investment impairments other than temporary		$ 0	$ 0	$ 0
Vastview Technology, Corp. (Vastview)
Schedule of Cost-method Investments [Line Items]
Invested in common stock	$ 3,360
Cost method investment capital return				$ 46	$ 808
Recognized an impairment charges						$ 2,462	$ 0

Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Land	$ 8,813	$ 8,058
Buildings	21,254	19,813
Machinery and equipment	15,995	13,443
Furniture and fixtures	6,446	5,131
Leasehold and buildings improvement	4,656	4,229
Software	17,505	29,796
Total	74,669	80,470
Accumulated Depreciation	36,390	45,176
Prepayment and construction in progress	12,190	243
Property, Plant and Equipment, Net	50,469	35,537	$ 30,195
Software
Property, Plant and Equipment [Line Items]
Accumulated Depreciation	14,421	25,807
Buildings
Property, Plant and Equipment [Line Items]
Accumulated Depreciation	2,648	2,240
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Accumulated Depreciation	11,983	10,573
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Accumulated Depreciation	3,980	3,492
Leasehold and buildings improvement
Property, Plant and Equipment [Line Items]
Accumulated Depreciation	$ 3,358	$ 3,064

Property And Equipment - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Operating Leased Assets [Line Items]
Operating leased renewal period of land and buildings	3 years
Net carrying value lease asset	$ 746
Annual lease and rental income	$ 41

Intangible Assets Acquired from Acquisition (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Intangible Assets [Line Items]
Accumulated Impairment	$ (30,808)	$ (30,808)
FCI, Centronix and Shannon
Intangible Assets [Line Items]
Cost	33,758	25,377
Accumulated Impairment	(4,474)	(4,474)
Accumulated Amortization	(21,954)	(20,903)
Net Carrying Amount	7,330
FCI, Centronix and Shannon \| Core Technology
Intangible Assets [Line Items]
Cost	15,809	15,809
Accumulated Impairment	(4,474)	(4,474)
Accumulated Amortization	(11,335)	(11,335)
FCI, Centronix and Shannon \| Customer Relationships
Intangible Assets [Line Items]
Cost	8,325	8,325
Accumulated Amortization	(8,325)	(8,325)
FCI, Centronix and Shannon \| Order backlog
Intangible Assets [Line Items]
Cost	1,243	1,243
Accumulated Amortization	(1,243)	$ (1,243)
FCI, Centronix and Shannon \| Development technology
Intangible Assets [Line Items]
Cost	8,381
Accumulated Amortization	(1,051)
Net Carrying Amount	$ 7,330

Goodwill And Acquired Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended			60 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011	Jul. 01, 2015
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization of intangible assets	$ 1,051	$ 0	$ 0
Intangible asset impairment losses	0	0	0
Goodwill impairment	0	0	$ 0
Goodwill	68,660	$ 35,467
FCI, Centronix and BTL
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill acquired during period				$ 66,300
Shannon Systems
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill acquired during period	$ 33,204
Goodwill					$ 33,204

Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Cost	$ 99,504	$ 66,300
Accumulated Impairment	(30,808)	(30,808)
Foreign Currency Adjustment	(36)	(25)
Net Carrying Amount	$ 68,660	$ 35,467

Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accrued Expenses and Other Current Liabilities [Line Items]
Wages and bonus	$ 20,365	$ 12,093
Dividends	15,839	153
Research and development payable	2,953	2,468
License fees and royalties	4,173	2,982
Professional fees	2,126	1,714
Equipment	1,285	1,170
Others	5,340	3,066
Accrued expenses and other current liabilities	$ 52,081	$ 23,646

Pension Plan - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation	$ 2,098	$ 1,762	$ 1,369
Estimated amortization of net gain from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year	19
Taiwan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions and Recognized Pension Costs under Labor Pension Act	$ 1,015	$ 872	$ 788
Contributions Based on Percentage Employee Salaries under Labor Standards Law	2.00%
The contribution under defined benefit plans	$ 57
FCI
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
The contribution under defined benefit plans	$ 745
Minimum \| Taiwan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of Contribution by an Employer to Employees Pension	6.00%

Changes in Benefits Obligation And Plan Assets And Reconciliation of Funded Status (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in benefit obligation
Projected benefit obligation at beginning of year	$ 3,320	$ 2,098	$ 1,897
Service cost	273	437	440
Interest cost	57	58	58
Actuarial loss (gain)	79	814	(202)
Benefits paid	(97)	(87)	(95)
Projected benefit obligation at end of year	3,632	3,320	2,098
Change in plan assets
Fair value of plan assets at beginning of year	2,556	2,319	1,925
Actual return on plan assets	33	31	43
Employer contributions	328	282	433
Benefits paid	(117)	(76)	(82)
Fair value of plan assets at end of year	2,800	2,556	2,319
Funded status recognized as an other asset (liabilities)	$ (832)	$ (764)	$ 221

Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Net loss	$ 852	$ 848	$ 460
Transition obligation	1	1	1
Total recognized in accumulated other comprehensive income	$ 853	$ 849	$ 461	$ 258

Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Periodic Benefit Cost:
Service cost	$ 273	$ 437	$ 440
Interest cost	57	58	58
Projected return on plan assets	(47)	(51)	(47)
Amortization of unrecognized net transition obligation and unrecognized net actuarial gain	27	(19)	(3)
Net periodic benefit cost	$ 310	$ 425	$ 448

Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss):
Recognize the decrease in net gain	$ 4	$ 388	$ 203
Amortization of net gain	0	0	0
Total recognized in other comprehensive loss	$ 4	$ 388	$ 203

Expected Benefit Payments (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Schedule of Pension Expected Future Benefit Payments [Line Items]
2016	$ 146
2017	290
2018	175
2019	140
2020	120
2021 and thereafter	$ 748

Actuarial Assumptions to Determine Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Taiwan
Weighted-average assumptions used to determine benefit obligations:
Discount rate	1.75%	2.00%	1.88%
Rate of compensation increase	4.25%	4.25%	4.25%
Weighted-average assumptions used to determine net projected benefit cost:
Discount rate	1.75%	2.00%	1.88%
Expected long-term return on plan assets	2.00%	2.00%	2.00%
Rate of compensation increase	4.25%	4.25%	4.25%
Korea
Weighted-average assumptions used to determine benefit obligations:
Discount rate	3.90%	4.10%	5.20%
Rate of compensation increase	4.00%	5.00%	2.60%
Weighted-average assumptions used to determine net projected benefit cost:
Discount rate	3.90%	4.10%	5.20%
Expected long-term return on plan assets	1.20%	2.00%	3.00%
Rate of compensation increase	4.00%	5.00%	2.60%

Fair Values Of FCI's Pension Plan Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of pension plan assets	$ 2,800	$ 2,556	$ 2,319	$ 1,925
FCI
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of pension plan assets	1,803	1,605
FCI \| Guaranteed interest contract \| Kyobo Life Insurance Co. Ltd.
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of pension plan assets	823	730
FCI \| Fixed Deposit \| Industrial Bank of Korea
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of pension plan assets	$ 980	$ 875

Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components Of Income Tax Expense Benefit [Line Items]
Current	$ 17,338	$ 15,630	$ 8,591
Deferred	911	471	1,181
Income tax expense	$ 18,249	$ 16,101	$ 9,772

Income (loss) Before Income Taxes for Domestic and Foreign Entities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]
Income (loss) before income taxes, domestic	$ (12,037)	$ (12,761)	$ (8,080)
Income (loss) before income taxes, foreign	90,537	73,329	45,228
INCOME BEFORE INCOME TAX	$ 78,500	$ 60,568	$ 37,148

Reconciliation of Income Tax Expense on Pretax Income at Statutory Rate and Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation Of Income Taxes [Line Items]
Cayman statutory rate	$ 0	$ 0	$ 0
Tax on pretax income at statutory rate	18,765	15,727	6,788
Tax-exempt income	(906)	(2,573)	(4,325)
Permanent differences	(1,065)	(396)	1,730
Temporary differences	(330)	(344)	1,732
Alternative minimum tax	4	1,170	2,203
Income tax (10%) on undistributed earnings	2,460	2,491	3,396
Net changes in income tax credit	(897)	(899)	708
Net changes in valuation allowance of deferred income tax assets	1,621	733	(2,364)
Net operating loss carryforwards	(2,052)	(1,298)	(189)
Liabilities related to unrealized tax benefits	672	91	(39)
Adjustment of prior years' taxes and others	(23)	1,399	132
Income tax expense	$ 18,249	$ 16,101	$ 9,772

Deferred Income Tax Assets (liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Components of Deferred Tax Provision [Line Items]
Notes and accounts receivable	$ 82	$ 141
Stock-based compensation	544	615
Allowance for sales return	173	105
Inventory reserve	1,478	814
Foreign currency translation	(1,949)	(1,273)
Property and equipment	360	452
Investment tax credits	8,295	7,823
Net operating loss carryforwards	10,651	9,621
Others	20	14
Valuation allowance	(19,044)	(16,791)
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	$ 610	$ 1,521

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Tax Credit Carryforward [Line Items]
Change in valuation allowance	$ 2,253	$ 515	$ 1,075
Income tax holiday description	Profits generated from certain products of SMI Taiwan are exempted from income tax for five years beginning January 1, 2010 and January 1, 2012.
Accumulated undistributed earnings from a foreign subsidiary	$ 242,000
Deferred tax liability	0
Unrecognized tax benefits that would affect effective tax rate	5,639
Total amount of interest expense and penalties	363	343	$ 627
Total amount of accrued interest and penalties	1,977	$ 1,674
Federal
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards for income tax purposes	$ 9,427
Federal net operating loss carryforwards expiration year	2035
Research And Development \| Federal
Tax Credit Carryforward [Line Items]
Deferred tax assets tax credit carryforwards	$ 2,444
Tax credit carryforward expiration year for federal	2035
Research And Development \| State
Tax Credit Carryforward [Line Items]
Deferred tax assets tax credit carryforwards	$ 1,711
Tax credit carryforward expiration year for state	No expiration date
Taiwan
Tax Credit Carryforward [Line Items]
Income tax exemption term	5 years
FCI \| Research And Development
Tax Credit Carryforward [Line Items]
Deferred tax assets tax credit carryforwards	$ 4,139
FCI \| Research And Development \| Minimum
Tax Credit Carryforward [Line Items]
Tax credit carryforward expiration year for federal	2015
FCI \| Research And Development \| Maximum
Tax Credit Carryforward [Line Items]
Tax credit carryforward expiration year for federal	2019

Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Balance, beginning of year	$ 4,655	$ 5,815	$ 3,520
Increases in tax positions taken in current year	2,337	446	2,947
Decrease in tax position taken in prior year primarily related to the resolution of tax audit	(1,353)	(1,606)	(652)
Balance, end of year	$ 5,639	$ 4,655	$ 5,815

Summary of Major Jurisdictions and Tax Year Subject to Examination Tax Authorities (Detail)	12 Months Ended
	Dec. 31, 2015
HONG KONG
Income Tax Examination [Line Items]
Years Subject to Income Tax Examination	2013 and onward
Taiwan
Income Tax Examination [Line Items]
Years Subject to Income Tax Examination	2010 and onward
Korea
Income Tax Examination [Line Items]
Years Subject to Income Tax Examination	2010 and onward
United States
Income Tax Examination [Line Items]
Years Subject to Income Tax Examination	2007 onward

Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands		3 Months Ended								12 Months Ended
	Nov. 02, 2015	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 21, 2013
Retained Earnings Adjustments [Line Items]
Dividend distribution allowance description										SMI Taiwan subsidiary may only distribute dividends after it has made allowances as determined under ROC GAAP at each year-end for: a. Payment of taxes; b. Recovery of prior years’ deficits, if any; c. 10% of remaining balance after deduction for a and b as legal reserve; d. Special reserve based on relevant laws or regulations or 10% of remaining balance for deduction from above a to c as special reserve when necessary; e. Cash or stock bonus to employees at 0.01% of any remaining earnings after the above reserves have been appropriated, based on a resolution of the board of directors. If bonus to employees is in the form of stock, the bonus may also be appropriated to employees of subsidiaries under the board of directors’ approval;
Dividend declared	$ 0.15	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.2625	$ 0.15	$ 0.15
Treasury stock, share repurchase program retire period													2013-07
Taiwan
Retained Earnings Adjustments [Line Items]
Bonus distribution to employees										0.01%
American Depositary Shares
Retained Earnings Adjustments [Line Items]
Dividend declared	$ 0.6
ADSs repurchased during period, shares												891
ADSs repurchased during period, cost												$ 10,000,000
Average purchase price per ADS												$ 11.24
American Depositary Shares \| Maximum
Retained Earnings Adjustments [Line Items]
Repurchase of shares													$ 40,000,000

Cash Dividends Declared Per Ordinary Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Nov. 02, 2015	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends [Line Items]
Dividend Per Share	$ 0.15	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.0375	$ 0.2625	$ 0.15	$ 0.15
Amount		$ 5,232	$ 5,230	$ 5,166	$ 5,156	$ 5,084	$ 5,081	$ 5,060	$ 5,056	$ 20,784	$ 20,281

Equity Incentive Plan - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 30, 2010	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2009	Dec. 31, 2006	Jun. 03, 2015	Apr. 22, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary shares for issuance upon exercise of stock options and restricted stock units		579,000
Stock option exchange for new stock option granted	4,369,000
Stock options exercise price	$ 1.47
Eligible stock options exchanged for new stock options granted	3,785,000
Stock Option Granted		0	0	0
Stock Option Granted Intrinsic Value		$ 3,688	$ 1,565	$ 594
Total unrecognized compensation cost related to non-vested share-based compensation		0
Cash received from employee toward stock option exercise		494	514	422
Tax effect for stock-based compensation benefit (expense)		$ 561	(24)	343
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted exercise price	$ 1.85
2005 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary shares for issuance upon exercise of stock options and restricted stock units								10,000,000
Ordinary shares for issuance upon exercise of stock options and restricted stock units					15,000,000	15,000,000
Conversion ratio of restricted stock unit to ordinary shares		One-for-one
2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary shares for issuance upon exercise of stock options and restricted stock units							20,000,000
Restricted Stock Units \| The 2005 Plan and The 2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested share-based compensation		$ 5,112
Stock Options And Restricted Stock Units Exercised
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax effect for stock-based compensation benefit (expense)		$ 1,647	$ 1,231	$ 1,599

Summary of Plan Includes Stock Options and Restricted Stock Units (Detail) - Stock Option And Restricted Stock Unit Plans - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Available for grant at beginning date	1,687,000	3,566,000	5,336,000
Authorized	20,000,000
Restricted stock units granted	(2,000,000)	(1,923,000)	(1,893,000)
Option and restricted stock units forfeited	175,000	44,000	123,000
Available for grant at ending balance	19,862,000	1,687,000	3,566,000

Summary of Stock Option Activity and Related Information (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Options Shares
Outstanding at beginning period	1,058	1,410	1,697
Options forfeited	(143)
Options exercised	(336)	(352)	(287)
Outstanding at ending period	579	1,058	1,410
Options vested and expected to vest after ending period	579	1,058	1,410
Options exercisable at ending period	579
Weighted Average Exercise Price
Outstanding at beginning period	$ 1.47	$ 1.47	$ 1.47
Options forfeited	1.47
Options exercised	1.47	1.46	1.47
Outstanding at ending period	1.47	1.47	$ 1.47
Options vested and expected to vest after ending period	1.47	1.47
Options exercisable at ending period	1.47
Options vested and expected to vest after ending period	$ 1.47	$ 1.47
Weighted Average Remaining Contractual Life
Outstanding at ending period	11 months 1 day	1 year 4 months 6 days	2 years 1 month 21 days
Options vested and expected to vest after ending period	11 months 1 day	1 year 4 months 6 days	2 years 1 month 21 days
Options exercisable at ending period	11 months 1 day

Summary of Status of Restricted Stock Units and Changes (Detail) - Restricted Stock Units - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Nonvested Stock Units
Nonvested at beginning period	2,160	3,921	7,018
Restricted stock units granted	2,000	1,923	1,893
Restricted stock units vested	(2,003)	(3,640)	(4,867)
Restricted stock units forfeited	(32)	(44)	(123)
Nonvested at ending period	2,125	2,160	3,921
Weighted Average Grant Date Fair Value
Nonvested at beginning period	$ 4.90	$ 2.90	$ 2.68
Restricted stock units granted	6.83	5.13	3.13
Restricted stock units vested	4.96	2.96	2.60
Restricted stock units forfeited	5.85	4.92	2.60
Nonvested at ending period	$ 6.65	$ 4.90	$ 2.90
Weighted Average Remaining Recognition Period (Years)
Nonvested at ending period	8 months 23 days	3 months 22 days	5 months 5 days

Table Of Stock-based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 10,418	$ 10,347	$ 10,262
Cost of Sales
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	261	282	308
Research and Development Expense
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	6,565	6,773	6,351
Selling and Marketing Expense
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	1,790	1,746	2,197
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 1,802	$ 1,546	$ 1,406

Commitments And Contingencies - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended							12 Months Ended
	Mar. 29, 2016	Oct. 31, 2015	Jul. 31, 2015	Dec. 31, 2014	Jan. 31, 2014	Jan. 31, 2012	Jul. 31, 2010	Mar. 31, 2010	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Apr. 17, 2009	Apr. 25, 2007
Commitments and Contingencies Disclosure [Line Items]
Operating lease rental expenses									$ 2,453	$ 1,981	$ 1,763
Minimum operating lease payment, 2016									1,771
Minimum operating lease payment, 2017									786
Minimum operating lease payment, 2018									580
Minimum operating lease payment, 2019									184
Minimum operating lease payment, 2020									0
Unpaid accounts receivable from distributor, filed for Chapter 11 bankruptcy protection				$ 31,256					61,293	31,256
Adversary proceeding pending on litigation filled by AASI creditor liquidating trust												$ 854
Litigation settlement expenses								$ 220
Percentage of total investment forfeited from FCI, TLi Inc. ("TLI"), OCI Materials Co., Ltd ("OCI")upon withdrew from the Pangyo Cooperative							10.00%
FCI
Commitments and Contingencies Disclosure [Line Items]
Restricted cash deposited				455					$ 425	$ 455
All American
Commitments and Contingencies Disclosure [Line Items]
Unpaid accounts receivable from distributor, filed for Chapter 11 bankruptcy protection													$ 256
All American \| Subsequent Event
Commitments and Contingencies Disclosure [Line Items]
Distribution claim received as beneficiary	$ 112
All American \| First Distribution
Commitments and Contingencies Disclosure [Line Items]
Distribution claim received as beneficiary						$ 21
All American \| Second Distribution
Commitments and Contingencies Disclosure [Line Items]
Distribution claim received as beneficiary					$ 36
All American \| Third Distribution
Commitments and Contingencies Disclosure [Line Items]
Distribution claim received as beneficiary				$ 12
All American \| Forth Target Distribution
Commitments and Contingencies Disclosure [Line Items]
Distribution claim received as beneficiary			$ 51
All American \| Fifth Target Distribution
Commitments and Contingencies Disclosure [Line Items]
Distribution claim received as beneficiary		$ 31

Segment Information - Additional Information (Detail)	12 Months Ended
Segment Information - Additional Information (Detail)	Dec. 31, 2015 Segment
Reportable segment	1

Revenue by Product Category (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 361,297	$ 289,323	$ 225,308
Mobile Storage
Segment Reporting Information [Line Items]
Net sales	302,910	241,614	185,488
Mobile Communications
Segment Reporting Information [Line Items]
Net sales	50,896	40,034	31,022
Others
Segment Reporting Information [Line Items]
Net sales	$ 7,491	$ 7,675	$ 8,798

Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net sales	$ 361,297	$ 289,323	$ 225,308
Taiwan
Net sales	71,387	57,244	47,653
United States
Net sales	39,558	26,265	22,528
Japan
Net sales	19,636	11,180	3,936
Korea
Net sales	150,118	150,557	115,287
China
Net sales	69,623	35,008	29,129
Others
Net sales	$ 10,975	$ 9,069	$ 6,775

Major customers representing at least 10% of net sales (Detail) - Net sales - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Samsung

Receivables From Major Customers [Line Items]

Revenue major customer

^[1]

$ 30,065

$ 36,037

Major customers percentage of net sales

^[1]

10.00%

16.00%

SK Hynix

Receivables From Major Customers [Line Items]

Revenue major customer

$ 108,645

$ 107,227

$ 67,977

Major customers percentage of net sales

30.00%

37.00%

30.00%

[1]	Less than 10%

Long-lived Assets (Property And Equipment, net) by Geographic Area (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Property and equipment, net	$ 50,469	$ 35,537	$ 30,195
Taiwan
Segment Reporting Information [Line Items]
Property and equipment, net	32,014	28,739	24,066
United States
Segment Reporting Information [Line Items]
Property and equipment, net	274	142	54
Korea
Segment Reporting Information [Line Items]
Property and equipment, net	1,891	2,477	1,773
China
Segment Reporting Information [Line Items]
Property and equipment, net	16,268	4,163	4,266
Japan
Segment Reporting Information [Line Items]
Property and equipment, net	$ 22	$ 16	$ 36

Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments - trading bond funds	$ 681	$ 703
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments - trading bond funds	$ 681	$ 703

Fair Value Measurement - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jul. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets fair value disclosure nonrecurring basis		$ 0	$ 0	$ 0
Assets measured at fair value nonrecurring basis, loss incurred		$ 0	$ 0	$ 0
Senior Notes
Held-to-maturity investments, investment maturity date	2016-07	2016-07