Silicon Image (SIMG) 10-Q 7 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document Document And Entity Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'SIMG	'
Entity Registrant Name	'SILICON IMAGE INC	'
Entity Central Index Key	'0001003214	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	77,362,605

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current Assets:	'	'
Cash and cash equivalents	$79,283	$29,069
Short-term investments	54,801	78,398
Accounts receivable, net of allowances for doubtful accounts of $1,548 at September 30, 2013 and $1,263 at December 31, 2012	41,407	37,936
Inventories	14,001	11,268
Prepaid expenses and other current assets	7,805	8,105
Deferred income taxes	1,039	841
Total current assets	198,336	165,617
Property and equipment, net	14,381	14,840
Deferred income taxes, non-current	4,144	4,144
Intangible assets, net (Note 6)	11,118	11,452
Goodwill	21,646	21,646
Other assets	8,596	9,043
Total assets	258,221	226,742
Current Liabilities:	'	'
Accounts payable	18,721	10,690
Accrued and other current liabilities	20,259	19,600
Deferred margin on sales to distributors	10,245	10,340
Deferred license revenue	2,579	2,185
Total current liabilities	51,804	42,815
Other long-term liabilities	16,918	16,827
Total liabilities	68,722	59,642
Commitments and contingencies (Note 8)	'	'
Stockholders’ Equity:	'	'
Convertible preferred stock, par value $0.001; 5,000,000 shares authorized; no shares issued or outstanding	'	'
Common stock, par value $0.001; 150,000,000 shares authorized; shares issued and outstanding: 77,660,972 shares at September 30, 2013 and 77,003,599 shares at December 31, 2012	101	99
Additional paid-in capital	534,064	511,522
Treasury stock, 27,001,296 shares at September 30, 2013 and 25,330,124 shares at December 31, 2012	-156,200	-143,912
Accumulated deficit	-188,338	-200,792
Accumulated other comprehensive income	-128	183
Total stockholders’ equity	189,499	167,100
Total liabilities and stockholders’ equity	$258,221	$226,742

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Allowances for doubtful accounts	$1,548	$1,263
Convertible preferred stock, par value (in dollars per share)	$0.00	$0.00
Convertible preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Convertible preferred stock, shares issued (in shares)	0	0
Convertible preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	77,660,972	77,003,599
Common stock, shares outstanding (in shares)	77,660,972	77,003,599
Treasury stock, shares issue (in shares)	27,001,296	25,330,124

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue:	'	'	'	'
Product	$66,337	$62,197	$180,359	$156,679
Licensing	12,974	11,722	34,670	36,081
Total revenue	79,311	73,919	215,029	192,760
Cost of revenue and operating expenses:	'	'	'	'
Cost of product revenue	33,222	30,760	90,043	79,710
Cost of licensing revenue	185	99	614	406
Research and development	18,424	17,848	57,207	60,067
Selling, general and administrative	16,191	14,834	48,690	45,167
Amortization and impairment of acquisition-related intangible assets	405	496	886	1,488
Restructuring expense	483	73	476	164
Total cost of revenue and operating expenses	68,910	64,110	197,916	187,002
Income from operations	10,401	9,809	17,113	5,758
Proceeds from legal settlement	'	'	1,275	'
Other than temporary impairment of a privately-held company investment	'	-7,467	-1,500	-7,467
Interest income and other, net	168	323	1,059	1,106
Income (loss) before provision for income taxes and equity in net loss of an unconsolidated affiliate	10,569	2,665	17,947	-603
Income tax expense	1,488	2,464	5,118	8,521
Equity in net loss of an unconsolidated affiliate	116	609	375	1,803
Net income (loss)	$8,965	($408)	$12,454	($10,927)
Net income (loss) per share – basic	$0.12	$0	$0.16	($0.13)
Net income (loss) per share – diluted	$0.11	$0	$0.16	($0.13)
Weighted average shares – basic	77,530	82,504	77,399	82,647
Weighted average shares – diluted	78,995	82,504	78,783	82,647

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Cost of product revenue	'	'	'	'
Stock-based compensation expense	$163	$97	$451	$419
Research and development	'	'	'	'
Stock-based compensation expense	879	812	2,724	2,714
Selling, general and administrative	'	'	'	'
Stock-based compensation expense	$1,440	$1,124	$4,649	$3,896

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income (loss)	$8,965	($408)	$12,454	($10,927)
Components of accumulated other comprehensive income (loss), net of zero tax:	'	'	'	'
Foreign currency translation adjustments	71	21	102	58
Fair value of effective cash flow hedges	'	36	'	20
Unrealized gains (losses) on available-for-sale securities	'	'	'	'
Unrealized gain (loss) arising during the period	22	98	-271	225
Reclassification adjustment for gains included in net income	'	-2	-142	-63
Total unrealized gain (loss) on available-for-sale securities	22	96	-413	162
Other comprehensive income (loss)	93	153	-311	240
Comprehensive income (loss)	$9,058	($255)	$12,143	($10,687)

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:	'	'
Net income (loss)	$12,454	($10,927)
Adjustments to reconcile net income (loss) to cash provided by operating activities:	'	'
Depreciation	4,699	4,536
Stock-based compensation expense	7,824	7,029
Amortization of investment premium	805	1,574
Tax benefits from employee stock-based transactions	345	524
Amortization and impairment of intangible assets	2,354	1,819
Excess tax benefits from employee stock-based transactions	-345	-524
Non-operating proceeds from legal settlement	-1,275	'
Other than temporary impairment of a privately-held company investment	1,500	7,467
Equity in net loss of an unconsolidated affiliate	375	1,803
Others	409	339
Changes in assets and liabilities:	'	'
Accounts receivable	-4,126	-14,559
Inventories	-2,733	-8,441
Prepaid expenses and other assets	-189	3,545
Accounts payable	8,168	5,062
Accrued and other liabilities	853	558
Deferred margin on sales to distributors	436	2,609
Deferred license revenue	-95	582
Cash provided by operating activities	31,459	2,996
Cash flows from investing activities:	'	'
Proceeds from sales of short-term investments	56,829	67,286
Purchases of short-term investments	-33,770	-55,367
Purchases of property and equipment	-4,075	-6,634
Proceeds from legal settlement	1,275	'
Investment in privately-held companies	-1,500	-7,250
Cash paid for assets purchased from a privately-held company	-300	'
Purchase of intellectual properties	-1,891	-915
Other	103	'
Cash provided by (used in) investing activities	16,671	-2,880
Cash flows from financing activities:	'	'
Proceeds from employee stock program	5,375	4,958
Excess tax benefits from employee stock-based transactions	345	524
Repurchases of restricted stock units for income tax withholding	-1,905	-2,120
Repurchases of common stock	-1,383	-6,401
Others	-81	'
Cash provided by(used in) financing activities	2,351	-3,039
Effect of exchange rate changes on cash and cash equivalents	-267	-24
Net increase (decrease) in cash and cash equivalents	50,214	-2,947
Cash and cash equivalents — beginning of period	29,069	37,125
Cash and cash equivalents — end of period	79,283	34,178
Supplemental cash flow information:	'	'
Cash payment for income taxes	-4,681	-4,730
Restricted stock units vested	5,401	6,114
Property and equipment and other assets purchased but not paid for	416	1,592
Unrealized gain (loss) on available-for-sale securities	($413)	$162

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2013
BASIS OF PRESENTATION	'
	NOTE 1. BASIS OF PRESENTATION
	In the opinion of management, the accompanying unaudited condensed consolidated financial statements of Silicon Image, Inc. (the “Company”, “Silicon Image”, “we” or “our”) have been prepared on a basis consistent with our December 31, 2012 audited financial statements and include all adjustments, consisting of normal recurring adjustments, necessary to fairly state the condensed consolidated balance sheets of Silicon Image and our subsidiaries as of September 30, 2013 and December 31, 2012 and the related condensed consolidated statements of operations for the three and nine months ended September 30, 2013 and 2012, condensed consolidated statements of comprehensive income (loss) for the three and nine months ended September 30, 2013 and 2012, and the related condensed consolidated statements of cash flows for the nine months ended September 30, 2013 and 2012. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012. Financial results for the three and nine months ended September 30, 2013 are not necessarily indicative of future financial results.
	Use of Estimates
	The preparation of financial statements in conformity with generally accepted accounting principles requires the Company to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Areas where significant judgment and estimates are applied include revenue recognition, stock-based compensation, valuation, impairment and fair value hierarchy of short-term investments, inventory reserves, impairment of goodwill and long-lived assets, income taxes, deferred tax assets and legal matters. Actual results could differ materially from these estimates.
	Principles of Consolidation
	The condensed consolidated financial statements include the accounts of Silicon Image, Inc. and its subsidiaries after elimination of all significant intercompany balances and transactions.
	Summary of Significant Accounting Policies
	There have been no changes to the Company’s significant accounting policies during the three and nine months ended September 30, 2013 as compared to the significant accounting policies described in the Company’s audited consolidated financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012.
	Change in Accounting Principle
	During the three months ended September 30, 2013, the Company increased its ownership interest in a privately-held company, or investee (Note 4). As a result of the change in ownership interest and after considering the changes in the level of its participation in the management and interaction with the investee, the Company determined that it has the ability to exert significant influence on the investee. Accordingly, the Company changed its accounting for the investee from the cost method to the equity method and will hence recognize its proportionate share of the investee’s operating results. In accordance with ASC 323 Investments – Equity Method and Joint Ventures, the consolidated financial statements for the prior periods have been retrospectively restated to account for the investment for all periods. The effect of the change only has an impact to the condensed consolidated financial statements for the three months ended March 31, 2013 and June 30, 2013 and did not have any impact to the consolidated financial statements for any periods in 2012.
	The Company’s financial statements for the three months ended March 31, 2013 and June 30, 2013 have been retrospectively adjusted by its proportionate share of the investee’ net loss of $123,000 and $136,000, respectively,  to account for the investment in the investee as if the equity method of accounting had been applied for all periods. The adjustment decreased the carrying amount of its equity investment, increased its accumulated deficit, increased its net loss for the three months ended March 31, 2013, decreased its net income for the three months ended June 30, 2013 with no effect on cash flows.

Net_Income_Loss_Per_Share

Net Income (Loss) Per Share	9 Months Ended
	Sep. 30, 2013
NET INCOME (LOSS) PER SHARE	'
	NOTE 2. NET INCOME (LOSS) PER SHARE
	Basic net income (loss) per common share is computed by dividing the net income (loss) available to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted income (loss) per common share is computed by dividing net income (loss) available to common stockholders by the weighted-average number of shares of common stock outstanding during the period increased to include the number of additional shares of common stock that would have been outstanding if the potentially dilutive securities had been issued. Potentially dilutive securities include outstanding stock options, shares to be purchased under the employee stock purchase plan and unvested RSUs. The dilutive effect of potentially dilutive securities is reflected in diluted earnings per common share by application of the treasury stock method. Under the treasury stock method, an increase in the fair market value of the Company’s common stock can result in a greater dilutive effect from potentially dilutive securities.
	The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share amounts):
		Three Months Ended September 30,					Nine Months Ended September 30,
		2013		2012			2013		2012
	Numerator:
	Net income (loss)	$	8,965	$	(408	)	$	12,454	$	(10,927	)
	Denominator:
	Weighted average outstanding shares used to compute basic net income (loss) per share		77,530		82,504			77,399		82,647
	Effect of dilutive securities		1,465		—			1,384		—
	Weighted average outstanding shares used to compute diluted net income (loss) per share		78,995		82,504			78,783		82,647
	Net income (loss) per share – basic	$	0.12	$	(0.00	)	$	0.16	$	(0.13	)
	Net income (loss) per share – diluted	$	0.11	$	(0.00	)	$	0.16	$	(0.13	)
	For the three and nine months ended September 30, 2013, approximately 3.9 million and 4.5 million, respectively, common stock equivalents were excluded from the computation of diluted net income per share because their effect would have been anti-dilutive.
	As a result of the net loss for the three and nine months ended September 30, 2012, approximately 6.6 million and 5.3 million, respectively, weighted common stock equivalents were excluded from the computation of diluted net loss per share because their effect would have been anti-dilutive.

Balance_Sheet_Components

Balance Sheet Components	9 Months Ended
	Sep. 30, 2013
BALANCE SHEET COMPONENTS	'
	NOTE 3. BALANCE SHEET COMPONENTS
	The components of inventories, prepaid expenses and other current assets, property and equipment and other assets consisted of the following:
		September 30, 2013			December 31, 2012
		(In thousands)
	Inventories:
	Raw materials	$	5,347		$	4,036
	Work in process		3,484			1,874
	Finished goods		5,170			5,358
		$	14,001		$	11,268
	Prepaid expenses and other current assets:
	Prepaid software maintenance	$	3,809		$	3,542
	Other prepaid expenses		2,153			3,056
	Other current assets		1,843			1,507
		$	7,805		$	8,105
	Property and equipment:
	Computers and software	$	23,849		$	22,272
	Equipment		38,168			37,735
	Furniture and fixtures		2,657			1,535
			64,674			61,542
	Less: accumulated depreciation		(50,293	)		(46,702	)
	Total property and equipment, net	$	14,381		$	14,840
	Other assets:
	Investment in privately-held companies (Note 4)	$	7,124		$	6,000
	Warrant to purchase preferred stock of a privately-held company (Note 4)		-			1,690
	Others		1,472			1,353
		$	8,596		$	9,043
	In the fourth quarter of fiscal 2012, the Company increased its provision for excess and obsolete inventory to reflect the write down of certain unsalable inventory amounting to $6.2 million due to defects in the material used by one of our assembly vendors in the packaging process. In the third quarter of fiscal 2013, the Company entered into an agreement with the vendor whereby the vendor agreed to make a payment in the third and fourth quarter of fiscal 2013 based on the volume of inventory purchased from the vendor. The amount received in the third quarter of fiscal 2013 was approximately $1.0 million. In addition, the agreement included certain rebates for future purchases based on the volume of inventory purchased from the vendor. During the quarter ended September 30, 2013, the Company recognized a reduction in cost of goods sold of approximately $1.0 million related to this agreement.
	The components of accrued liabilities and other long-term liabilities were as follows:
		September 30, 2013			December 31, 2012
		(In thousands)
	Accrued and other current liabilities:
	Accrued royalties	$	6,218		$	6,203
	Accrued payroll and related expenses		7,463			7,317
	Accrued payables		4,666			3,080
	Others		1,912			3,000
		$	20,259		$	19,600
	Other long-term liabilities:
	Non-current liability for uncertain tax positions	$	14,512		$	14,410
	Others		2,406			2,417
		$	16,918		$	16,827

Investments

Investments	9 Months Ended
	Sep. 30, 2013
INVESTMENTS	'
	NOTE 4. INVESTMENTS
	Equity Method Investment In a Privately-Held Company
	On December 21, 2012, the Company agreed to purchase a 17.7% preferred stock equity ownership interest in a privately-held company that designs connectivity related software (“investee”) for a total consideration of $3.5 million. Concurrently with the initial $3.5 million equity investment agreement, the Company entered into the following agreements with the investee: (a) a call option agreement whereby the Company can acquire the investee at a purchase price of between $14.0 million and $20.0 million by fiscal 2014 plus earn-out payments of up to $10.75 million to be paid by fiscal 2016 subject to certain conditions; (b) a sales representative agreement; and (c) technology and IP license agreement. The $3.5 million was paid in various tranches during 2012 and 2013. The Company accounted for this investment under the cost method up to the period ended June 30, 2013 as the Company did not have the ability to exert significant influence over the investee.
	In the third quarter of fiscal 2013, the Company increased its ownership interest to 21% by making an additional investment of $0.5 million. This increased the Company’s gross investment in the investee to $4.0 million. As a result of the change in ownership interest and after considering the changes in the level of its participation in the management and interaction with the investee, the Company determined that it has the ability to exert significant influence on the investee. Accordingly, the Company changed its accounting for the investee from the cost method to the equity method and will hence recognize its proportionate share of the investee’s operating results. In accordance with ASC 323 Investments – Equity Method and Joint Ventures, the consolidated financial statements for the prior periods have been retrospectively restated to account for the investment for all periods.  As a result of this change, the Company recognized its proportionate share of the investee’s net loss in the condensed consolidated statements of operations for the three and nine months ended September 30, 2013. Through September 30, 2013, the Company has reduced the value of its investment by approximately $375,000, representing of its proportionate share of the privately-held company’s net loss and amortization of intangible assets.
	Cost Method Investments
	Investment in privately-held company A
	In February 2012, the Company paid $3.5 million in cash to purchase a minority interest in a privately-held company which designs and develops wireless semiconductor chips. This investment is accounted for using the cost method as the Company’s ownership percentage is minor and the Company does not exert significant influence over the investee.
	Investment in privately-held company B
	In October 2012, the Company entered into an asset purchase agreement with a privately-held company for the purchase of certain intangible assets for $1.5 million. The Company may also be required to pay up to an additional $16.5 million of cash consideration if certain revenue levels are achieved and certain financial or operational performance conditions are met, during the two year period starting October 2012. Such additional consideration, if any, would become payable at the end of the measurement period in October 2014. The Company assessed that the likelihood that it would be required to pay the additional cash consideration was remote.
	Concurrently, the parties also executed a warrant purchase agreement pursuant to which the Company received warrants which provide the Company with the option to purchase 5.3 million shares of the privately-held company’s preferred stock at $0.717 per share before October 5, 2017. In allocating the purchase price between the warrant and the technology assets, the Company first measured the full value of the warrant and then assigned any residual amount of the price to the other assets (as the warrant was determined to be an available-for-sale security and thus is required to be carried at fair value). Management determined that the full purchase price was allocable to the warrants, and as such none of the initial purchase price was assigned to the intangible assets.
	As of June 30, 2013, the Company concluded that the investment in this privately-held company was impaired, and that such impairment is other than temporary.  In reaching this conclusion, the Company considered all available evidence, including that (i) the privately-held company had not achieved forecasted revenue or operating results, (ii) the privately-held company had limited liquidity or capital resources as of June 30, 2013, (iii) the privately-held company’s software business has deteriorated and (iv) the privately-held company efforts to raise additional financing have not been successful.  As a result of the Company’s analysis of these factors, the Company believes that the possibility is remote that the Company will exercise its warrants to purchase the privately-held company’s preferred stock or that the Company will realize any other value from these investments. While there is no incremental cost to the Company to continue to hold the warrants, the Company believes that the possibility of a recovery in the value of the shares underlying the warrant is remote. The Company reversed a previously recorded gain of $190,000 as a component of other comprehensive income and recorded an impairment charge of $1.5 million in the condensed consolidated statements of operations for the nine months ended September 30, 2013.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2013
FAIR VALUE MEASUREMENTS	'
	NOTE 5. FAIR VALUE MEASUREMENTS
	The Company records its financial instruments that are accounted for under FASB Accounting Standards Codification (ASC) No. 320-10-25, “Recognition of Investments in Debt and Equity Securities,” at fair value. The determination of fair value is based upon the fair value framework established by FASB ASC No. 820-10-35, “Fair Value Measurements and Disclosures – Subsequent Measurement” (ASC 820-10-35). ASC 820-10-35 provides that a fair value measurement assumes that the transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, in the most advantageous market for such asset or liability. The carrying value of the Company’s financial instruments including cash and cash equivalents and short-term investments approximates fair market value due to the relatively short period of time to maturity. The fair value of investments is determined using quoted market prices for those securities or similar financial instruments.
	The Company’s cash equivalents and short term investments are generally classified within Level 1 or Level 2 of the fair value hierarchy because they are valued using quoted market prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency.
	The Company’s Level 1 assets consist of money market fund securities. These instruments are generally classified within Level 1 of the fair value hierarchy because they are valued based on quoted market prices in active markets.
	The Company’s Level 2 assets include certificate of deposits, corporate securities and municipal securities and are valued by using a multi-dimensional relational model, the inputs, when available, are primarily benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data including market research publications.
	The Company’s Level 3 assets relate to warrants to purchase 5.3 million preferred stock of a privately held company at $0.717 per share (Note 4, Investment in privately-held company B). As of June 30, 2013, the Company concluded that the warrants are impaired, and that such impairment is other than temporary. The Company reversed a previously recorded gain of $190,000 as a component of other comprehensive income and recorded an impairment charge for the full amount of the Company’s initial investment in the warrants in its condensed consolidated statement of operations for the nine months ended September 30, 2013.
	The Company’s Level 3 liabilities consist of contingent consideration in connection with a business acquisition. The Company makes estimates regarding the fair value of contingent consideration liabilities on the acquisition date and at the end of each reporting period until the contingency is resolved. The fair value of this arrangement is determined by calculating the net present value of the expected payments using significant inputs that are not observable in the market, including the probability of achieving the milestone, revenue projections and discount rates. The fair value of the contingent consideration will increase or decrease according to the movement of the inputs. The Company does not expect the changes in these inputs to have a material impact on the Company’s consolidated financial statements.
	The Company measures certain assets, including its cost method investments, at fair value on a nonrecurring basis when they are deemed to be other-than-temporarily impaired. The fair values of these investments are determined based on valuation techniques using the best information available, and may include quoted market prices, market comparables, and discounted cash flow projections. An impairment charge is recorded when the cost of the investment exceeds its fair value and this condition is determined to be other-than-temporary. Other than as described in Note 4 related to a cost and equity method investment, the Company did not record any other-than-temporary impairments on those financial assets required to be measured at fair value on a nonrecurring basis in any period presented.
	For certain of the Company’s financial instruments, including cash held in banks, accounts receivable and accounts payable, the carrying amounts approximate fair value due to their short maturities.
	The following table presents the fair value of our financial instruments that are measured at fair value on a recurring basis as of September 30, 2013 (in thousands):
		Fair value measurements using
		Level 1			Level 2			Level 3					Assets (Liabilities)
													at fair value
	Assets:
	Cash equivalents:
	Money market funds	$	53,384		$	-		$	—				$			53,384
	Corporate securities		-			600			—							600
	Total cash equivalents	$	53,384		$	600		$	—				$			53,984
	Short-term investments:
	Certificate of deposits	$	—		$	10,842		$	—				$			10,842
	Municipal securities		—			33,192			—							33,192
	Corporate securities		—			10,767			—							10,767
	Total short-term investments	$	—		$	54,801		$	—				$			54,801
	Liabilities:
	Contingent considerations in connection with a business acquisition	$	—		$	—		$	(27	)			$			(27	)
	The cash equivalents in the above table exclude $25.3 million in cash held by the Company in its accounts or with investment fund managers as of September 30, 2013.
	The following table presents the fair value of our financial instruments that are measured at fair value on a recurring basis as of December 31, 2012 (in thousands):
		Fair value measurements using
		Level 1				Level 2					Level 3							Assets (Liabilities)
																		at fair value
	Assets:
	Cash equivalents:
	Money market funds	$	18,878				$	—				$		—					$	18,878
	Short-term investments:
	Certificate of deposits	$	—				$	10,525				$		—					$	10,525
	Municipal securities		—					52,513						—						52,513
	Corporate securities		—					15,360						—						15,360
	Total short-term investments	$	—				$	78,398				$		—					$	78,398
	Other assets:
	Fair value of warrant to purchase preferred stock (Note 4)	$	—				$	—				$		1,690					$	1,690
	Liabilities:
	Contingent considerations in connection with a business acquisition	$	—				$	—				$		(108	)				$	(108	)
	The cash equivalents in the above table exclude $10.2 million in cash held by the Company in its accounts or with investment fund managers as of December 31, 2012.
	The following table presents the changes in the Company’s Level 3 assets and liabilities, which are measured at fair value on a recurring basis, during the nine months ended September 30, 2013 and 2012 (in thousands):
		Fair Value Measurement Using Significant
		Unobservable Inputs
		2013			2012
	Assets:
	Beginning balance at January 1,	$	1,690		$	—
	Adjustment to fair value recorded during the period		(1,690	)		—
	(Note 4)
	Ending balance at September 30,	$	—		$	—
	Liabilities:
	Beginning balance at January 1,	$	(108	)	$	(1,304	)
	Payment of contingent consideration		81			590
	Adjustment to fair value of contingent consideration		—			16
	Ending balance at September 30,	$	(27	)	$	(698	)
	There were no transfers between Level 1, Level 2 and Level 3 fair value hierarchies during the three months ended September 30, 2013.

Intangible_Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2013
INTANGIBLE ASSETS	'
	NOTE 6. INTANGIBLE ASSETS
	The following table presents the Company’s purchased intangible assets, including those arising from business acquisitions, as of September 30, 2013 (in thousands):
				September 30, 2013
		Useful Life		Gross Carrying			Accumulated				Adjustments				Net Carrying
		(years)		Amount			Amortization								Amount
	Intangible assets with finite lives
	Intellectual Property	6		$	1,600		$	(711	)		$		—		$		889
	Core Technology	5			1,600			(853	)				—				747
	System Technology	3			400			(356	)				—				44
	Developed Technology	5-Mar			4,800			(1,175	)				(175	)			3,450
	Customer Relationship	5-Feb			1,500			(975	)				—				525
	Acquisition-related intangible assets				9,900			(4,070	)				(175	)			5,655
	Licensed Technology	5			6,137			(1,024	)				(250	)			4,863
	Total intangible assets with finite lives				16,037			(5,094	)				(425	)			10,518
	Intangible assets with indefinite lives
	Trade Name	indefinite			600			-					—				600
	Total intangible assets with indefinite lives				600			-					—				600
	Total purchased intangible assets			$	16,637		$	(5,094	)		$		(425	)	$		11,118
	In the third quarter of fiscal 2013, the Company determined that one of its developed technologies was impaired because the technology is no longer being used. The Company has written-off the unamortized balance of $175,000 in the condensed consolidated statements of operations for the three and nine months ended September 30, 2013.
	Amortization expense of developed technology is recorded to cost of product revenue. Amortization expense of licensed technology is recorded to research and development. Amortization expense of the remainder of the intangible assets with finite lives is recorded to amortization of acquisition-related intangible assets.
	For intangible assets that are subject to amortization, the Company recorded amortization expense on the condensed consolidated statements of operation as follows (in thousands):
		Three Months Ended September 30,										Nine Months Ended September 30,
		2013			2012					2013						2012
	Cost of product revenue	$	250		$	175				$				750		$		175
	Research and development		315			156								718				156
	Amortization of acquisition-related intangible assets		230			496								711				1,488
		$	795		$	827				$				2,179		$		1,819
	The annual expected amortization expense of intangible assets with finite lives is as follows (in thousands):
	Year ending December 31,	Amount
	2013 (remaining 3 months)	$	770
	2014		2,958
	2015		2,947
	2016		2,322
	2017		1,521
	Total	$	10,518

Restructuring_Charges

Restructuring Charges	9 Months Ended
	Sep. 30, 2013
RESTRUCTURING CHARGES	'
	NOTE 7. RESTRUCTURING CHARGES
	During the quarter ended September 30, 2013, the Company initiated certain restructuring activities intended to improve its operational efficiencies by reducing excess workforce and capacity. The Company records provisions for restructuring expenses when they are probable and estimable. Severance paid under ongoing benefit arrangements is recorded in accordance with ASC 712, Nonretirement Postemployment Benefits Recognition. One-time termination benefits are recorded in accordance with ASC 420, Exit Disposal Cost Obligations Recognition.
	For the three and nine months ended September 30, 2013, the Company recorded restructuring expense of approximately $483,000 and $476,000, respectively, which primarily consisted of severance and benefits of terminated employees, offset by the reversal of accrued severance and benefits resulting from a change in estimates of costs incurred for prior restructuring activities.
	For the three and nine months ended September 30, 2012, the Company recorded restructuring expense of approximately $73,000 and $164,000, respectively, which primarily consisted of the sublease portion of rent payments on an exited facility, offset by the reversal of accrued severance and benefits resulting from a change in estimates of costs incurred for prior restructuring activities.
	The table below summarizes the Company’s restructuring activities for the nine months ended September 30, 2013 (in thousands):
		Employee
		Severance
		and Benefits
	Accrued restructuring balance as of January 1, 2013		7
	Additional accruals		483
	Reversal		(7	)
	Cash payments		(216	)
	Accrued restructuring balance as of September 30, 2013		267
	The $267,000 outstanding restructuring liability as of September 30, 2013 consists primarily of employee severance benefits, which are expected to be fully paid by the fourth quarter of fiscal 2013.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
COMMITMENTS AND CONTINGENCIES	'
	NOTE 8. COMMITMENTS AND CONTINGENCIES
	Legal Proceedings
	From time to time the Company has been named as a defendant or has acted as plaintiff in judicial or administrative proceedings related to its business. Moreover, from time to time, the Company has received notices from licensees of its technology and from adopters of the standards for which the Company serves as agent disputing the payment of royalties and sometimes requesting a refund of royalties allegedly overpaid.
	The Company intends to defend any such matters vigorously.  However, the outcome of any litigation is inherently uncertain. Therefore, there can be no guarantee that the outcome of any such litigation, even litigation where the Company starts out as a plaintiff, may not have a material adverse effect on the Company business.
	Legal Settlement
	On May 16, 2011, the Company completed its acquisition of SiBEAM, Inc. pursuant to an Agreement and Plan of Merger dated April 13, 2011. The total merger consideration was $25.0 million in cash and stock, $3.0 million of which was held in escrow against potential claims for indemnifiable damages.  In May 2013, the Company received $1.3 million from the escrow agent in full satisfaction of any and all claims by Silicon Image Inc.
	Indemnifications
	Certain of the Company’s licensing agreements indemnify its customers for any expenses or liabilities resulting from claimed infringements of third party patents, trademarks or copyrights by its products. Certain of these indemnification provisions are perpetual from execution of the agreement and, in some instances the maximum amount of potential future indemnification is not limited. To date, the Company has not paid any such claims or been required to defend any lawsuits with respect to any such claim.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2013
STOCK-BASED COMPENSATION	'
	NOTE 9. STOCK-BASED COMPENSATION
	The Company has a share-based compensation program that provides its Board of Directors with broad discretion in creating equity incentives for employees, officers, non-employees and non-employee board members. This program includes incentive and non-statutory stock option grants and restricted stock units (RSUs) for employees, market-based RSUs for the executive officers and RSUs for non-employee board members pursuant to which such individuals will receive grants immediately following each annual meeting of stockholders. These awards are granted under the stockholder approved 2008 Equity Incentive Plan. Stock option grants under the discretionary grant program generally vest as follows: 25% of the shares vest on the first anniversary of the vesting commencement date and the remaining 75% vest proportionately each month over the next 36 months of continued service. RSU grants generally vest over a one to four-year period. RSU grants to non-employee members of our board vest on the earlier of the first anniversary of the grant date or the date of the Company’s first annual meeting of stockholders following the grant date. These awards are granted under various programs, all of which are approved by the stockholders. Additionally, our Employee Stock Purchase Plan (ESPP) allows employees to purchase shares of common stock at the lower of 85% of the fair market value on the commencement date of the six-month offering period or on the last day of the six-month offering period.
	Valuation and Expense Information under Stock-based Compensation
	The fair value of each option grant is estimated on the date of grant using the Black-Scholes option valuation model with the following weighted-average assumptions:
		Three Months Ended September 30,								Nine Months Ended September 30,
		2013				2012				2013					2012
	Employee stock option plans:
	Expected life in years			4.0			4.0					4.0				4.0
	Expected volatility			58.7	%		71.0		%			59.3		%		71.0	%
	Risk-free interest rate			1.0	%		0.5		%			1.0		%		0.5	%
	Expected dividends			none			none					none				none
	Weighted average fair value	$		2.45		$	2.22			$		2.41			$	2.26
	Employee Stock Purchase Plan:
	Expected life in years			0.5			0.5					0.5				0.5
	Expected volatility			31.2	%		57.9		%			35.8		%		63.0	%
	Risk-free interest rate			0.1	%		0.1		%			0.1		%		0.1	%
	Expected dividends			none			none					none				none
	Weighted average fair value	$		1.27		$	1.63			$		1.27			$	1.74
	Amortization method — The value of options and RSUs are amortized to expense, net of estimated forfeitures, on a straight line basis over the vesting period.
	Expected Life — The expected life of the options represents the estimated period of time until exercised and is based on historical experience of similar awards, giving consideration to the contractual terms, vesting schedules, and expectations of future employee behavior. The expected term for the ESPP is based on the term of the purchase period.
	Expected Volatility — The volatility is based on the Company’s historical common stock volatility derived from historical stock price data for historical periods commensurate with the options’ expected life.
	Risk-Free Interest Rate —The risk-free interest rate is based on the implied yield currently available on United States Treasury zero-coupon issues with a term equal to the expected life at the date of grant of the options.
	Expected Dividend — The expected dividend is based on our history and expected dividend payouts. The expected dividend yield is zero as the Company has historically paid no dividends and does not anticipate dividends to be paid in the future.
	For the three months ended September 30, 2013 and 2012, 349,906 and 414,927 shares of common stock, respectively, were purchased under ESPP program. For the nine months ended September 30, 2013 and 2012, 915,984 and 932,537 shares of common stock, respectively, were purchased under the ESPP program. At September 30, 2013, the Company had $0.4 million of total unrecognized compensation expense under the ESPP program. The unamortized compensation expense will be amortized on a straight-line basis over a remaining period of approximately 4.5 months.
	Stock Option Activity
	The following is a summary of activity under the Company’s stock option plans during the nine months ended September 30, 2013, excluding RSUs (in thousands, except weighted average exercise price and contractual term):
		Number of			Weighted			Weighted			Aggregate
		Shares			Average			Average			Intrinsic
					Exercise			Remaining			Value
					Price per			Contractual
					Share			Terms in Years
	At January 1, 2013		6,434		$	5.78
	Granted		1,076			5.29
	Forfeitures and cancellations		(663	)		8.21
	Exercised		(386	)		4.16
	At September 30, 2013		6,461		$	5.54			4.81		$		5,051
	Vested and expected to vest at September 30, 2013		5,923		$	5.59			4.70		$		4,772
	Exercisable at September 30, 2013		3,411		$	6.14			3.98		$		2,718
	The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value that option holders would have received had all option holders exercised their options on September 30, 2013. The aggregate intrinsic value is the difference between the Company’s closing stock price on the last trading day of the quarter ended September 30, 2013 and the exercise price, multiplied by the number of outstanding or exercisable in-the-money options. The aggregate intrinsic value excludes the effect of stock options that have a zero intrinsic value. The total pre-tax intrinsic value of options exercised, representing the difference between the fair market value of the Company’s common stock on the date of the exercise and the exercise price of each option, for the three and nine months ended September 30, 2013 was $350,000 and $502,000, respectively, and $91,000 and $274,000 for the three and nine months ended September 30, 2012, respectively.
	At September 30, 2013, the total unrecognized pre-tax stock-based compensation expense related to stock options, which the Company expects to recognize over the remaining weighted-average vesting period of 2.37 years, was $4.8 million, net of estimated forfeitures.
	Restricted Stock Units
	The RSUs that the Company grants to its employees typically vest ratably over a certain period of time, subject to the employee’s continuing service to the Company over that period. RSUs granted to executive officers and non-executive employees typically vest over a four-year period.
	RSUs are converted into shares of the Company’s common stock upon vesting on a one-for-one basis. The cost of the RSUs is determined using the fair value of the Company’s common stock on the date of the grant. Compensation is recognized on a straight-line basis over the requisite service period of each grant adjusted for estimated forfeitures. Each RSU award granted from the Company’s 2008 Equity Incentive Plan will reduce the number of options available for issuance by 1.5 shares.
	A summary of activity with respect to the Company’s RSUs during the nine months ended September 30, 2013 is as follows: (in thousands, except weighted-average grant date fair value per share):
		Number of Units			Weighted-Average
					Grant Date Fair
					Value Per Share
	Outstanding at January 1, 2013		2,794		$	5.36
	Granted		2,030			5.32
	Vested		(1,027	)		5.28
	Forfeitures and cancellations		(167	)		5.24
	Outstanding at September 30, 2013		3,630		$	5.37
	Of the 3,630,381 RSUs outstanding as of September 30, 2013, approximately 2,705,578 units are expected to vest after considering the applicable forfeiture rate.
	The aggregate fair value of awards that vested during the three and nine months ended September 30, 2013 was $1.5 million and $5.4 million, respectively, which represents the market value of Silicon Image common stock on the date that the RSUs vested. The grant date fair value of awards that vested during the three and nine months ended September 30, 2013 was $1.2 million and $5.4 million, respectively. The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy the minimum statutory tax withholding requirements.
	In August 2012, the Company granted 331,500 RSUs with market-based vesting criteria to executives and certain key employees pursuant to 2008 Plan. These market-based awards vest over four years with 25% of the total number of shares vesting on each anniversary of the grant date. Whether or not they vest is determined by a comparison of the price of the Company’s common stock and the price set by the Company, which ranged from $4.52 to $5.39 over the vesting period. The grant-date fair value of these awards was $1.2 million, estimated using a Monte Carlo simulation method which takes into account the probability that the market conditions of these awards will be achieved. Compensation costs related to these awards will be recognized over the vesting period regardless of whether the market conditions are satisfied, provided that the requisite service has been provided. As of September 30, 2013, 228,375 shares of the outstanding restricted stock units were market-based restricted stock units.
	In August and September 2013, the Company granted 875,000 performance-based restricted stock units (PBRSUs) to executives with vesting based on the Company’s GAAP earnings per share over the vesting period of 4.4 years.  Each PBRSU represents the right to receive one share of the Company’s common stock upon the vesting of such PBRSU, and is subject to the terms of the Company’s 2008 Equity Incentive Plan.  Any PBRSUs not vesting on a vesting date due to the Company’s GAAP earnings per share for the fiscal year in question not meeting the target for such fiscal year established by the Compensation Committee shall be forfeited.  The grant date fair value of these awards was $4.7 million. As of September 30, 2013, the Company expects the earnings per share targets to be met and thus all the PBRSUs less estimated forfeitures are expected to vest.
	At September 30, 2013, the total unrecognized pre-tax stock-based compensation expense related to non-vested RSUs, which the Company expects to recognize over the remaining weighted-average vesting period of 2.57 years, was $11.8 million, net of estimated forfeitures.
	During the three months ended September 30, 2013 and 2012, the Company repurchased 101,123 and 43,988 shares of stock, respectively, for an aggregate value of $0.6 million and $205,000, respectively, from the employees upon the vesting of their RSUs that were granted under the Company’s 2008 Equity Incentive Plan to satisfy the employees’ minimum statutory tax withholding requirement. During the nine months ended September 30, 2013 and 2012, the Company repurchased 364,826 and 436,708 shares of stock, respectively, for an aggregate value of $1.9 million and $2.1 million, respectively, The Company will continue to repurchase shares of stock from employees as their RSUs vest to satisfy the employees’ minimum statutory tax withholding requirement.
	Stock Repurchase Program
	In April 2012, the Company’s Board of Directors authorized a $50 million stock repurchase program. The repurchases may occur from time to time in the open market or in privately negotiated transactions. The timing and amount of any repurchase of shares will be determined by the Company’s management, based on its evaluation of market conditions, cash on hand and other factors and may be made under a stock repurchase plan. The authorization will stay in effect until the authorized aggregate amount is expended or the authorization is modified by the Board of Directors. The program does not obligate the Company to acquire any particular amount of stock and purchases under the program may be commenced or suspended at any time, or from time to time, without prior notice. Further, the stock repurchase program may be modified, extended or terminated by the Board at any time. In July 2013, the Company’s Board of Directors authorized a new share repurchase plan as a follow-on to its current plan which had $10.3 million remaining for repurchase. At the conclusion of the Company’s existing plan, the Company will commence a new share repurchase plan whereby the Company will be authorized to repurchase its common stock up to an aggregate purchase of $50 million.
	On November 9, 2012, the Company entered into an accelerated share repurchase (ASR) agreement with Barclays Capital, Inc. (Barclays) to repurchase an aggregate of $30.0 million of its common stock. Pursuant to the ASR agreement, the Company paid $30.0 million in November 2012 and received a total of 5,072,463 shares, 750,000 shares and 300,383  shares of its common stock during the year ended December 31, 2012, the three months ended March 31, 2013 and the three months ended June 30, 2013, respectively, which are recorded as treasury stock in the condensed consolidated balance sheet. The ASR agreement was fully settled in June 2013 and the average price of shares repurchased under the ASR was $4.90 per share.
	The Company repurchased 255,963 shares of its common stock on the open market at a total cost of $1.4 million with an average price per share of $5.40 during the three months ended September 30, 2013. The Company repurchased 1,306,346 shares of its common stock on the open market at a total cost of $6.5 million with an average price per share of $5.0 during the nine months ended September 30, 2013.

Provision_for_Income_Taxes

Provision for Income Taxes	9 Months Ended
	Sep. 30, 2013
Provision for Income Taxes	'
	NOTE 10. PROVISION FOR INCOME TAXES
	The Company recorded an income tax expense of $1.5 million and $5.1 million for the three and nine months ended September 30, 2013. The effective tax rate for the three and nine months ended September 30, 2013 were 14.1% and 28.5%, respectively. The difference between the effective tax rate and the income tax determined by applying the statutory federal income tax rate of 35% was due primarily to foreign withholding taxes associated with licensing revenue. This difference is reduced by the tax benefit of the release of interest reserves due to the close of the statute related to unrecognized tax benefits.
	The Company continued to maintain a valuation allowance as a result of uncertainties related to the realization of its net deferred tax assets at September 30, 2013. The valuation allowance was established as a result of weighing all positive and negative evidence. The valuation allowance reflects the conclusion of management that it is more likely than not that benefits from certain deferred tax assets will not be realized. If actual results differ from these estimates or these estimates are adjusted in future periods, the valuation allowance may require adjustment which could materially impact the Company’s financial position and results of operations. It is reasonably possible that sometime in the next 12 months positive evidence will be sufficient to release a material amount of our valuation allowance; however there is no assurance that this will occur. The required accounting for the potential release would have significant deferred tax consequences and would increase earnings in the quarter in which the allowance is released.
	The Company recorded an income tax expense of $2.5 million and $8.5 million for the three and nine months ended September 30, 2012. The effective tax rates for the three and nine months ended September 30, 2012 were 24.3% and 124.1%, respectively. The difference between the effective tax rate and the income tax determined by applying the statutory federal income tax rate of 35% was due primarily to foreign taxes (including foreign withholding taxes), a provision for charges in lieu of income taxes related to employee stock plans where the windfall benefit is charged to tax expense with the benefit to additional paid-in capital, and state taxes.
	The Company’s policy is to include interest and penalties related to unrecognized tax benefits within the provision for income taxes. The Company accrued interest and penalties of $3,000 and $70,000 for the three and nine months ended September 30, 2013, respectively, and approximately $56,000 and $162,000 for the three and nine months ended September 30, 2012, respectively. In addition, the Company released $1.0 million of interest related to the unrecognized tax benefits within the provision for income taxes for the three months ended September 30, 2013. The Company conducts business globally and, as a result, the Company and its subsidiaries file income tax returns in various jurisdictions throughout the world including with the U.S. federal and various U.S. state jurisdictions as well as with various foreign jurisdictions. In the normal course of business, the Company is subject to examination by taxing authorities throughout the world.

Customer_and_Geographic_Inform

Customer and Geographic Information	9 Months Ended
	Sep. 30, 2013
CUSTOMER AND GEOGRAPHIC INFORMATION	'
	NOTE 11. CUSTOMER AND GEOGRAPHIC INFORMATION
	The Company operates in one reportable operating segment, semiconductors and IP solutions for the secure storage, distribution and presentation of high-definition content. The Company’s Chief Executive Officer, who is considered to be the Company’s chief operating decision maker, reviews financial information presented on one operating segment basis for purposes of making operating decisions and assessing financial performance.
	Revenue
	Revenue by geographic area based on bill to location was as follows (in thousands):
		Three Months Ended September 30,								Nine Months Ended September 30,
		2013				2012				2013				2012
	United States	$		39,406		$		33,001		$		104,093		$		77,693
	Taiwan			10,885				16,340				31,715				46,317
	Japan			8,532				10,095				27,179				30,037
	Europe			7,794				3,658				19,744				11,169
	China			7,345				5,531				19,141				13,844
	Korea			4,808				4,778				11,871				12,400
	Others			541				516				1,286				1,300
	Total revenue	$		79,311		$		73,919		$		215,029		$		192,760
	The Company’s revenue by its primary markets was as follows (in thousands):
		Three Months Ended September 30,								Nine Months Ended September 30,
		2013				2012				2013				2012
	Mobile	$		43,938		$		38,712		$		122,148		$		90,839
	Consumer Electronics			18,525				18,631				48,166				51,674
	Personal Computers			3,874				4,854				10,045				14,166
	Total product revenue			66,337				62,197				180,359				156,679
	Licensing			12,974				11,722				34,670				36,081
	Total revenue	$		79,311		$		73,919		$		215,029		$		192,760
	Certain prior period amounts have been reclassified for consistency with the current period presentation. This change in classification had no effect on the previously reported condensed consolidated statements of operations for any period. For the three and nine months ended September 30, 2012, the Company has reclassified $0.8 million and $1.4 million of revenue, respectively, from Personal Computers to Consumer Electronics to conform to its current presentation, which has been updated to reflect changes in how the Company views its products.
	The Company’s revenue by customers was as follows (in percentage):
		Three Months Ended September 30,								Nine Months Ended September 30,
		2013				2012				2013				2012
	Samsung Electronics		45.2		%		38.3		%		43.0		%		34.5		%
	Weikeng		10.2		%		9.6		%		8.8		%		8.4		%
	Edom Technology		5.4		%		10.7		%		6.8		%		11.4		%
	At September 30, 2013, one customer represented 45% of net accounts receivable. At December 31, 2012, one customer represented 24.0% of net accounts receivable. The Company’s top five customers, including distributors, generated 72.1% and 69.0% of the Company’s revenue for three and nine months ended September 30, 2013, respectively, and 68.3% and 65.0% of the Company’s revenue for the three and nine months ended September 30, 2012.
	Property and Equipment
	The table below presents the net book value of the property and equipment by their physical location (in thousands):
		September 30, 2013				December 31, 2012
	United States	$		6,773		$		6,519
	China			4,936				4,834
	Taiwan			1,265				1,586
	India			1,172				1,509
	Others			235				392
	Net book value	$		14,381		$		14,840

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2013
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with generally accepted accounting principles requires the Company to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Areas where significant judgment and estimates are applied include revenue recognition, stock-based compensation, valuation, impairment and fair value hierarchy of short-term investments, inventory reserves, impairment of goodwill and long-lived assets, income taxes, deferred tax assets and legal matters. Actual results could differ materially from these estimates.
Principles of Consolidation	'
	Principles of Consolidation
	The condensed consolidated financial statements include the accounts of Silicon Image, Inc. and its subsidiaries after elimination of all significant intercompany balances and transactions.
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	There have been no changes to the Company’s significant accounting policies during the three and nine months ended September 30, 2013 as compared to the significant accounting policies described in the Company’s audited consolidated financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012.
Change in Accounting Principle	'
	Change in Accounting Principle
	During the three months ended September 30, 2013, the Company increased its ownership interest in a privately-held company, or investee (Note 4). As a result of the change in ownership interest and after considering the changes in the level of its participation in the management and interaction with the investee, the Company determined that it has the ability to exert significant influence on the investee. Accordingly, the Company changed its accounting for the investee from the cost method to the equity method and will hence recognize its proportionate share of the investee’s operating results. In accordance with ASC 323 Investments – Equity Method and Joint Ventures, the consolidated financial statements for the prior periods have been retrospectively restated to account for the investment for all periods. The effect of the change only has an impact to the condensed consolidated financial statements for the three months ended March 31, 2013 and June 30, 2013 and did not have any impact to the consolidated financial statements for any periods in 2012.
	The Company’s financial statements for the three months ended March 31, 2013 and June 30, 2013 have been retrospectively adjusted by its proportionate share of the investee’ net loss of $123,000 and $136,000, respectively,  to account for the investment in the investee as if the equity method of accounting had been applied for all periods. The adjustment decreased the carrying amount of its equity investment, increased its accumulated deficit, increased its net loss for the three months ended March 31, 2013, decreased its net income for the three months ended June 30, 2013 with no effect on cash flows.

Net_Income_Loss_Per_Share_Tabl

Net Income (Loss) Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Computation of Basic and Diluted Net Income (Loss) Per Share	'
	The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share amounts):
		Three Months Ended September 30,					Nine Months Ended September 30,
		2013		2012			2013		2012
	Numerator:
	Net income (loss)	$	8,965	$	(408	)	$	12,454	$	(10,927	)
	Denominator:
	Weighted average outstanding shares used to compute basic net income (loss) per share		77,530		82,504			77,399		82,647
	Effect of dilutive securities		1,465		—			1,384		—
	Weighted average outstanding shares used to compute diluted net income (loss) per share		78,995		82,504			78,783		82,647
	Net income (loss) per share – basic	$	0.12	$	(0.00	)	$	0.16	$	(0.13	)
	Net income (loss) per share – diluted	$	0.11	$	(0.00	)	$	0.16	$	(0.13	)

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2013
Current and Non Current Assets	'
	The components of inventories, prepaid expenses and other current assets, property and equipment and other assets consisted of the following:
		September 30, 2013			December 31, 2012
		(In thousands)
	Inventories:
	Raw materials	$	5,347		$	4,036
	Work in process		3,484			1,874
	Finished goods		5,170			5,358
		$	14,001		$	11,268
	Prepaid expenses and other current assets:
	Prepaid software maintenance	$	3,809		$	3,542
	Other prepaid expenses		2,153			3,056
	Other current assets		1,843			1,507
		$	7,805		$	8,105
	Property and equipment:
	Computers and software	$	23,849		$	22,272
	Equipment		38,168			37,735
	Furniture and fixtures		2,657			1,535
			64,674			61,542
	Less: accumulated depreciation		(50,293	)		(46,702	)
	Total property and equipment, net	$	14,381		$	14,840
	Other assets:
	Investment in privately-held companies (Note 4)	$	7,124		$	6,000
	Warrant to purchase preferred stock of a privately-held company (Note 4)		-			1,690
	Others		1,472			1,353
		$	8,596		$	9,043
Accrued Liabilities and Other Liabilities	'
	The components of accrued liabilities and other long-term liabilities were as follows:
		September 30, 2013			December 31, 2012
		(In thousands)
	Accrued and other current liabilities:
	Accrued royalties	$	6,218		$	6,203
	Accrued payroll and related expenses		7,463			7,317
	Accrued payables		4,666			3,080
	Others		1,912			3,000
		$	20,259		$	19,600
	Other long-term liabilities:
	Non-current liability for uncertain tax positions	$	14,512		$	14,410
	Others		2,406			2,417
		$	16,918		$	16,827

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2013
Assets and Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy	'
	The following table presents the fair value of our financial instruments that are measured at fair value on a recurring basis as of September 30, 2013 (in thousands):
		Fair value measurements using
		Level 1			Level 2			Level 3					Assets (Liabilities)
													at fair value
	Assets:
	Cash equivalents:
	Money market funds	$	53,384		$	-		$	—				$			53,384
	Corporate securities		-			600			—							600
	Total cash equivalents	$	53,384		$	600		$	—				$			53,984
	Short-term investments:
	Certificate of deposits	$	—		$	10,842		$	—				$			10,842
	Municipal securities		—			33,192			—							33,192
	Corporate securities		—			10,767			—							10,767
	Total short-term investments	$	—		$	54,801		$	—				$			54,801
	Liabilities:
	Contingent considerations in connection with a business acquisition	$	—		$	—		$	(27	)			$			(27	)
	The cash equivalents in the above table exclude $25.3 million in cash held by the Company in its accounts or with investment fund managers as of September 30, 2013.
	The following table presents the fair value of our financial instruments that are measured at fair value on a recurring basis as of December 31, 2012 (in thousands):
		Fair value measurements using
		Level 1				Level 2					Level 3							Assets (Liabilities)
																		at fair value
	Assets:
	Cash equivalents:
	Money market funds	$	18,878				$	—				$		—					$	18,878
	Short-term investments:
	Certificate of deposits	$	—				$	10,525				$		—					$	10,525
	Municipal securities		—					52,513						—						52,513
	Corporate securities		—					15,360						—						15,360
	Total short-term investments	$	—				$	78,398				$		—					$	78,398
	Other assets:
	Fair value of warrant to purchase preferred stock (Note 4)	$	—				$	—				$		1,690					$	1,690
	Liabilities:
	Contingent considerations in connection with a business acquisition	$	—				$	—				$		(108	)				$	(108	)
Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following table presents the changes in the Company’s Level 3 assets and liabilities, which are measured at fair value on a recurring basis, during the nine months ended September 30, 2013 and 2012 (in thousands):
		Fair Value Measurement Using Significant
		Unobservable Inputs
		2013			2012
	Assets:
	Beginning balance at January 1,	$	1,690		$	—
	Adjustment to fair value recorded during the period		(1,690	)		—
	(Note 4)
	Ending balance at September 30,	$	—		$	—
	Liabilities:
	Beginning balance at January 1,	$	(108	)	$	(1,304	)
	Payment of contingent consideration		81			590
	Adjustment to fair value of contingent consideration		—			16
	Ending balance at September 30,	$	(27	)	$	(698	)

Intangible_Assets_Tables

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2013
Intangible Assets	'
	The following table presents the Company’s purchased intangible assets, including those arising from business acquisitions, as of September 30, 2013 (in thousands):
				September 30, 2013
		Useful Life		Gross Carrying			Accumulated				Adjustments				Net Carrying
		(years)		Amount			Amortization								Amount
	Intangible assets with finite lives
	Intellectual Property	6		$	1,600		$	(711	)		$		—		$		889
	Core Technology	5			1,600			(853	)				—				747
	System Technology	3			400			(356	)				—				44
	Developed Technology	5-Mar			4,800			(1,175	)				(175	)			3,450
	Customer Relationship	5-Feb			1,500			(975	)				—				525
	Acquisition-related intangible assets				9,900			(4,070	)				(175	)			5,655
	Licensed Technology	5			6,137			(1,024	)				(250	)			4,863
	Total intangible assets with finite lives				16,037			(5,094	)				(425	)			10,518
	Intangible assets with indefinite lives
	Trade Name	indefinite			600			-					—				600
	Total intangible assets with indefinite lives				600			-					—				600
	Total purchased intangible assets			$	16,637		$	(5,094	)		$		(425	)	$		11,118
Schedule of Intangible Asset Amortization Expense as Recorded on Statement of Operations	'
	For intangible assets that are subject to amortization, the Company recorded amortization expense on the condensed consolidated statements of operation as follows (in thousands):
		Three Months Ended September 30,										Nine Months Ended September 30,
		2013			2012					2013						2012
	Cost of product revenue	$	250		$	175				$				750		$		175
	Research and development		315			156								718				156
	Amortization of acquisition-related intangible assets		230			496								711				1,488
		$	795		$	827				$				2,179		$		1,819
Annual Expected Amortization Expense of Intangible Assets	'
	The annual expected amortization expense of intangible assets with finite lives is as follows (in thousands):
	Year ending December 31,	Amount
	2013 (remaining 3 months)	$	770
	2014		2,958
	2015		2,947
	2016		2,322
	2017		1,521
	Total	$	10,518

Restructuring_Charges_Tables

Restructuring Charges (Tables)	9 Months Ended
	Sep. 30, 2013
Summary of Restructuring Activities	'
	The table below summarizes the Company’s restructuring activities for the nine months ended September 30, 2013 (in thousands):
		Employee
		Severance
		and Benefits
	Accrued restructuring balance as of January 1, 2013		7
	Additional accruals		483
	Reversal		(7	)
	Cash payments		(216	)
	Accrued restructuring balance as of September 30, 2013		267

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2013
Option Valuation Model Assumptions	'
	The fair value of each option grant is estimated on the date of grant using the Black-Scholes option valuation model with the following weighted-average assumptions:
		Three Months Ended September 30,								Nine Months Ended September 30,
		2013				2012				2013					2012
	Employee stock option plans:
	Expected life in years			4.0			4.0					4.0				4.0
	Expected volatility			58.7	%		71.0		%			59.3		%		71.0	%
	Risk-free interest rate			1.0	%		0.5		%			1.0		%		0.5	%
	Expected dividends			none			none					none				none
	Weighted average fair value	$		2.45		$	2.22			$		2.41			$	2.26
	Employee Stock Purchase Plan:
	Expected life in years			0.5			0.5					0.5				0.5
	Expected volatility			31.2	%		57.9		%			35.8		%		63.0	%
	Risk-free interest rate			0.1	%		0.1		%			0.1		%		0.1	%
	Expected dividends			none			none					none				none
	Weighted average fair value	$		1.27		$	1.63			$		1.27			$	1.74
Stock Option Plans Excluding Restricted Stock Units	'
	The following is a summary of activity under the Company’s stock option plans during the nine months ended September 30, 2013, excluding RSUs (in thousands, except weighted average exercise price and contractual term):
		Number of			Weighted			Weighted			Aggregate
		Shares			Average			Average			Intrinsic
					Exercise			Remaining			Value
					Price per			Contractual
					Share			Terms in Years
	At January 1, 2013		6,434		$	5.78
	Granted		1,076			5.29
	Forfeitures and cancellations		(663	)		8.21
	Exercised		(386	)		4.16
	At September 30, 2013		6,461		$	5.54			4.81		$		5,051
	Vested and expected to vest at September 30, 2013		5,923		$	5.59			4.70		$		4,772
	Exercisable at September 30, 2013		3,411		$	6.14			3.98		$		2,718
Restricted Stock Unit Activity	'
	A summary of activity with respect to the Company’s RSUs during the nine months ended September 30, 2013 is as follows: (in thousands, except weighted-average grant date fair value per share):
		Number of Units			Weighted-Average
					Grant Date Fair
					Value Per Share
	Outstanding at January 1, 2013		2,794		$	5.36
	Granted		2,030			5.32
	Vested		(1,027	)		5.28
	Forfeitures and cancellations		(167	)		5.24
	Outstanding at September 30, 2013		3,630		$	5.37

Customer_and_Geographic_Inform1

Customer and Geographic Information (Tables)	9 Months Ended
	Sep. 30, 2013
Revenue by Geographic Area Based on Bill to Location	'
	Revenue by geographic area based on bill to location was as follows (in thousands):
		Three Months Ended September 30,								Nine Months Ended September 30,
		2013				2012				2013				2012
	United States	$		39,406		$		33,001		$		104,093		$		77,693
	Taiwan			10,885				16,340				31,715				46,317
	Japan			8,532				10,095				27,179				30,037
	Europe			7,794				3,658				19,744				11,169
	China			7,345				5,531				19,141				13,844
	Korea			4,808				4,778				11,871				12,400
	Others			541				516				1,286				1,300
	Total revenue	$		79,311		$		73,919		$		215,029		$		192,760
Revenue by its Primary Markets	'
	The Company’s revenue by its primary markets was as follows (in thousands):
		Three Months Ended September 30,								Nine Months Ended September 30,
		2013				2012				2013				2012
	Mobile	$		43,938		$		38,712		$		122,148		$		90,839
	Consumer Electronics			18,525				18,631				48,166				51,674
	Personal Computers			3,874				4,854				10,045				14,166
	Total product revenue			66,337				62,197				180,359				156,679
	Licensing			12,974				11,722				34,670				36,081
	Total revenue	$		79,311		$		73,919		$		215,029		$		192,760
Revenue by Customers	'
	The Company’s revenue by customers was as follows (in percentage):
		Three Months Ended September 30,								Nine Months Ended September 30,
		2013				2012				2013				2012
	Samsung Electronics		45.2		%		38.3		%		43.0		%		34.5		%
	Weikeng		10.2		%		9.6		%		8.8		%		8.4		%
	Edom Technology		5.4		%		10.7		%		6.8		%		11.4		%
Property and Equipment by Physical Location	'
	The table below presents the net book value of the property and equipment by their physical location (in thousands):
		September 30, 2013				December 31, 2012
	United States	$		6,773		$		6,519
	China			4,936				4,834
	Taiwan			1,265				1,586
	India			1,172				1,509
	Others			235				392
	Net book value	$		14,381		$		14,840

Basis_of_Presentation_Addition

Basis of Presentation - Additional Information (Detail) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity in net loss of an unconsolidated affiliate	$116	$136	$123	$609	$375	$1,803

Net_Income_Loss_Per_Share_Comp

Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Net income (loss)	$8,965	($408)	$12,454	($10,927)
Weighted average outstanding shares used to compute basic net income (loss) per share	77,530	82,504	77,399	82,647
Effect of dilutive securities	1,465	'	1,384	'
Weighted average outstanding shares used to compute diluted net income (loss) per share	78,995	82,504	78,783	82,647
Net income (loss) per share – basic	$0.12	$0	$0.16	($0.13)
Net income (loss) per share – diluted	$0.11	$0	$0.16	($0.13)

Net_Income_Loss_Per_Share_Addi

Net Income (Loss) Per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Anti-dilutive common stock equivalents	3.9	6.6	4.5	5.3

Balance_Sheet_Components_Curre

Balance Sheet Components - Current and Non Current Assets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Dec. 21, 2012
In Thousands, unless otherwise specified
Inventories:	'	'	'
Raw materials	$5,347	$4,036	'
Work in process	3,484	1,874	'
Finished goods	5,170	5,358	'
Inventories	14,001	11,268	'
Prepaid expenses and other current assets:	'	'	'
Prepaid software maintenance	3,809	3,542	'
Other prepaid expenses	2,153	3,056	'
Other current assets	1,843	1,507	'
Prepaid expense and other current assets	7,805	8,105	'
Property and equipment:	'	'	'
Property and equipment, gross	64,674	61,542	'
Less: accumulated depreciation	-50,293	-46,702	'
Total property and equipment, net	14,381	14,840	'
Other assets:	'	'	'
Others	1,472	1,353	'
Other assets	8,596	9,043	'
Computers and software	'	'	'
Property and equipment:	'	'	'
Property and equipment, gross	23,849	22,272	'
Equipment	'	'	'
Property and equipment:	'	'	'
Property and equipment, gross	38,168	37,735	'
Furniture and fixtures	'	'	'
Property and equipment:	'	'	'
Property and equipment, gross	2,657	1,535	'
Privately-held companies	'	'	'
Other assets:	'	'	'
Investment in privately-held companies (Note 4)	7,124	6,000	3,500
Warrant to purchase preferred stock of a privately-held company (Note 4)	'	$1,690	'

Balance_Sheet_Components_Accru

Balance Sheet Components - Accrued Liabilities and Other Liabilities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Balance Sheet Components [Line Items]	'	'
Accrued royalties	$6,218	$6,203
Accrued payroll and related expenses	7,463	7,317
Accrued payables	4,666	3,080
Others	1,912	3,000
Total accrued and other current liabilities	20,259	19,600
Non-current liability for uncertain tax positions	14,512	14,410
Others	2,406	2,417
Total other long-term liabilities	$16,918	$16,827

Balance_Sheet_Components_Addit

Balance Sheet Components - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Balance Sheet Components [Line Items]	'	'
Write down of unsaleable inventory	'	$6.20
Amount received from vendor	1	'
Reduction in cost of goods sold	$1	'

Investments_Additional_Informa

Investments - Additional Information (Detail) (USD $)

9 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

Share data in Millions, except Per Share data, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 21, 2012

Oct. 31, 2012

Feb. 29, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Privately-held companies

Privately-held companies

Privately-held companies

Privately-held companies

Privately-held companies

Privately-held companies

Privately-held companies

Privately-held companies

Minimum

Maximum

Black Scholes Option Pricing Model

Technology Assets

Privately-held companies

Privately-held companies

Black Scholes Option Pricing Model

Schedule Of Equity Method Investments [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Cost method investments, percentage

'

'

17.70%

'

'

'

'

'

'

'

'

'

Equity ownership interest in a privately-held company related to software

'

'

$6,000,000

$7,124,000

$7,124,000

$3,500,000

'

'

'

'

'

'

Call option aggregate, purchase price

'

'

'

'

'

'

'

'

'

'

14,000,000

20,000,000

Earn-out payments

'

'

'

'

'

'

'

'

'

'

'

10,750,000

Purchase of intangible assets

'

'

'

'

'

'

1,500,000

'

'

'

'

'

Contingent payments in connection with a business acquisition

81,000

590,000

'

16,500,000

16,500,000

'

'

'

'

'

'

'

Receipt of warrant to purchase preferred stock

'

'

'

'

'

'

'

'

5.3

5.3

'

'

Preferred stock value per share

'

'

'

'

'

'

'

'

$0.72

$0.72

'

'

Unrealized gain on warrant

'

'

'

'

190,000

'

'

'

'

'

'

'

Other than temporary impairment

'

'

'

'

1,500,000

'

'

'

'

'

'

'

Equity Method Investment, Ownership Percentage

'

'

'

'

'

'

'

'

'

'

'

21.00%

Amount paid for additional investment

1,500,000

7,250,000

'

500,000

'

'

'

'

'

'

'

'

Cost method investments

'

'

'

4,000,000

4,000,000

'

'

3,500,000

'

'

'

'

Net loss and amortization of intangible assests

'

'

'

'

($375,000)

'

'

'

'

'

'

'

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis By Level within Fair Value Hierarchy (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Short-term investments	$54,801	$78,398
Fair Value, Measurements, Recurring	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	53,984	'
Short-term investments	54,801	78,398
Contingent considerations in connection with a business acquisition	-27	-108
Fair value of warrant to purchase preferred stock	'	1,690
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	53,384	'
Short-term investments	'	'
Contingent considerations in connection with a business acquisition	'	'
Fair value of warrant to purchase preferred stock	'	'
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	600	'
Short-term investments	54,801	78,398
Contingent considerations in connection with a business acquisition	'	'
Fair value of warrant to purchase preferred stock	'	'
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	'	'
Short-term investments	'	'
Contingent considerations in connection with a business acquisition	-27	-108
Fair value of warrant to purchase preferred stock	'	1,690
Money Market Funds | Fair Value, Measurements, Recurring	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	53,384	18,878
Money Market Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	53,384	18,878
Money Market Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	'	'
Money Market Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	'	'
Corporate Debt Securities | Fair Value, Measurements, Recurring	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	600	'
Short-term investments	10,767	15,360
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	'	'
Short-term investments	'	'
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	600	'
Short-term investments	10,767	15,360
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Cash and Cash Equivalents, Fair Value Disclosure	'	'
Short-term investments	'	'
Certificates of Deposit | Fair Value, Measurements, Recurring	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Short-term investments	10,842	10,525
Certificates of Deposit | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Short-term investments	'	'
Certificates of Deposit | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Short-term investments	10,842	10,525
Certificates of Deposit | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Short-term investments	'	'
Municipal Notes | Fair Value, Measurements, Recurring	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Short-term investments	33,192	52,513
Municipal Notes | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Short-term investments	'	'
Municipal Notes | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Short-term investments	33,192	52,513
Municipal Notes | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3	'	'
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'
Short-term investments	'	'

Fair_Value_Measurements_Change

Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Beginning balance, Asset	$1,690	'
Adjustment to fair value recorded during the period (Note 4)	-1,690	'
Ending balance, Asset	'	'
Beginning balance, Liabilities	-108	-1,304
Payment of contingent consideration	81	590
Adjustment to fair value of contingent consideration	'	16
Ending balance, Liabilities	($27)	($698)

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013
Share data in Millions, except Per Share data, unless otherwise specified			Privately-held companies	Privately-held companies
				Black Scholes Option Pricing Model
Fair Value Assets Measured On Recurring Basis [Line Items]	'	'	'	'
Receipt of warrant to purchase preferred stock	'	'	'	5.3
Preferred stock value per share	'	'	'	$0.72
Unrealized gain on warrant	'	'	$190,000	'
Cash held by company, accounts or investment fund managers	$25,300,000	$10,200,000	'	'

Intangible_Assets_Intangible_A

Intangible Assets - Intangible Assets (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	$16,037	'
Accumulated Amortization	-5,094	'
Adjustments	-425	'
Net Carrying Amount	10,518	'
Gross Carrying Amount - Indefinite	600	'
Net Carrying Amount - Indefinite	600	'
Total Gross Carrying Amount	16,637	'
Intangible assets, net (Note 6)	11,118	11,452
Intellectual Property	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Estimated useful life	'6 years	'
Gross Carrying Amount	1,600	'
Accumulated Amortization	-711	'
Net Carrying Amount	889	'
Core Technology	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Estimated useful life	'5 years	'
Gross Carrying Amount	1,600	'
Accumulated Amortization	-853	'
Net Carrying Amount	747	'
System Technology	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Estimated useful life	'3 years	'
Gross Carrying Amount	400	'
Accumulated Amortization	-356	'
Net Carrying Amount	44	'
Developed Technology	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	4,800	'
Accumulated Amortization	-1,175	'
Adjustments	-175	'
Net Carrying Amount	3,450	'
Developed Technology | Minimum	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Estimated useful life	'3 years	'
Developed Technology | Maximum	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Estimated useful life	'5 years	'
Customer Relationship	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	1,500	'
Accumulated Amortization	-975	'
Net Carrying Amount	525	'
Customer Relationship | Minimum	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Estimated useful life	'2 years	'
Customer Relationship | Maximum	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Estimated useful life	'5 years	'
Licensed Technology	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Estimated useful life	'5 years	'
Gross Carrying Amount	6,137	'
Accumulated Amortization	-1,024	'
Adjustments	-250	'
Net Carrying Amount	4,863	'
Acquisition-related intangible assets	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	9,900	'
Accumulated Amortization	-4,070	'
Adjustments	-175	'
Net Carrying Amount	5,655	'
Trade Names	'	'
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Useful Life (years) - Indefinite	'indefinite	'
Gross Carrying Amount - Indefinite	600	'
Net Carrying Amount - Indefinite	$600	'

Intangible_Assets_Schedule_of_

Intangible Assets - Schedule of Intangible Asset Amortization Expense as Recorded on the Statement of Operations (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Amortization Expense Location On Statement Of Operations [Line Items]	'	'	'	'
Amortization and impairment of acquisition-related intangible assets	$795	$827	$2,179	$1,819
Cost of product revenue	'	'	'	'
Amortization Expense Location On Statement Of Operations [Line Items]	'	'	'	'
Amortization and impairment of acquisition-related intangible assets	250	175	750	175
Research and development	'	'	'	'
Amortization Expense Location On Statement Of Operations [Line Items]	'	'	'	'
Amortization and impairment of acquisition-related intangible assets	315	156	718	156
Acquisition-related intangible assets	'	'	'	'
Amortization Expense Location On Statement Of Operations [Line Items]	'	'	'	'
Amortization and impairment of acquisition-related intangible assets	$230	$496	$711	$1,488

Intangible_Assets_Annual_Expec

Intangible Assets - Annual Expected Amortization Expense of Intangible Assets (Detail) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Intangible Assets Disclosure [Abstract]	'
2013 (remaining 3 months)	$770
2014	2,958
2015	2,947
2016	2,322
2017	1,521
Net Carrying Amount	$10,518

Intangible_Assets_Additional_I

Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Acquired Finite Lived Intangible Assets [Line Items]	'	'
Unamortized intangible assets, written-off	$175,000	$175,000

Restructuring_Charges_Addition

Restructuring Charges - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012
					Employee Severance and Benefits	Employee Severance and Benefits
Restructuring Cost And Reserve [Line Items]	'	'	'	'	'	'
Cost for the termination of the services	$483,000	$73,000	$476,000	$164,000	$483,000	'
Outstanding restructuring liability	'	'	'	'	$267,000	$7,000

Restructuring_Charges_Summary_

Restructuring Charges - Summary of Restructuring Activities (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Restructuring Cost And Reserve [Line Items]	'	'	'	'
Additional accruals	$483,000	$73,000	$476,000	$164,000
Employee Severance and Benefits	'	'	'	'
Restructuring Cost And Reserve [Line Items]	'	'	'	'
Accrued restructuring balance as of January 1, 2013	'	'	7,000	'
Additional accruals	'	'	483,000	'
Reversal	'	'	-7,000	'
Cash payments	'	'	-216,000	'
Accrued restructuring balance as of September 30, 2013	$267,000	'	$267,000	'

Commitment_and_Contingencies_A

Commitment and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended
In Millions, unless otherwise specified	31-May-13	Sep. 30, 2013
Loss Contingencies [Line Items]	'	'
Merger consideration in cash and stock value	'	$25
Escrow deposits	'	3
Cash received from escrow agent	$1.30	'

StockBased_Compensation_Option

Stock-Based Compensation - Option Valuation Model Assumptions (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Stock Option Plans	'	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'	'
Expected life in years	'4 years	'4 years	'4 years	'4 years
Expected volatility	58.70%	71.00%	59.30%	71.00%
Risk-free interest rate	1.00%	0.50%	1.00%	0.50%
Expected dividends	'	'	'	'
Weighted average fair value	$2.45	$2.22	$2.41	$2.26
Employee Stock Purchase Plan	'	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'	'
Expected life in years	'6 months	'6 months	'6 months	'6 months
Expected volatility	31.20%	57.90%	35.80%	63.00%
Risk-free interest rate	0.10%	0.10%	0.10%	0.10%
Expected dividends	'	'	'	'
Weighted average fair value	$1.27	$1.63	$1.27	$1.74

StockBased_Compensation_Stock_

Stock-Based Compensation - Stock Option Plans Excluding Restricted Stock Units (Detail) (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013
Number of Shares	'
Beginning Balance, shares	6,434
Granted, shares	1,076
Forfeitures and cancellations, shares	-663
Exercised, shares	-386
Ending balance, shares	6,461
Vested and expected to vest at September 30, 2013	5,923
Exercisable at September 30, 2013	3,411
Weighted Average Exercise Price Per Share	'
Beginning balance, Weighted Average Exercise Price Per Share	$5.78
Weighted Average Exercise Price Per Share, Granted	$5.29
Weighted Average Exercise Price Per Share, Forfeitures and Cancellations	$8.21
Weighted Average Exercise Price Per Share, Exercised	$4.16
Ending balance, Weighted Average Exercise Price Per Share	$5.54
Weighted Average Exercise Price Per Share, Vested and Expected to Vest Ending balance	$5.59
Weighted Average Exercise Price Per Share, Exercisable Ending balance	$6.14
Weighted Average Remaining Contractual Term in Years	'
Beginning balance	'4 years 9 months 22 days
Vested and expected to vest at September 30, 2013	'4 years 8 months 12 days
Exercisable at September 30, 2013	'3 years 11 months 23 days
Aggregate Intrinsic Value	'
Aggregate intrinsic value, Ending balance	$5,051
Aggregate intrinsic value, Vested and expected to vest Ending balance	4,772
Aggregate intrinsic value, Exercisable Ending balance	$2,718

StockBased_Compensation_Restri

Stock-Based Compensation - Restricted Stock Unit Activity (Detail) (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013
Number of Units	'
Outstanding Beginning balance	2,794
Granted. shares	2,030
Vested, shares	-1,027
Forfeitures and cancellations, shares	-167
Outstanding Ending balance	3,630
Weighted-Average Grant Date Fair Value Per Share	'
Outstanding Beginning balance	$5.36
Granted	$5.32
Vested	$5.28
Forfeitures and cancellations	$5.24
Outstanding Ending balance	$5.37

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)

1 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

1 Months Ended

9 Months Ended

Jul. 31, 2013

Apr. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Jun. 30, 2013

Mar. 31, 2013

Sep. 30, 2013

Dec. 31, 2012

Aug. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Aug. 31, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Aug. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Accelerated Share Repurchase Agreement

Accelerated Share Repurchase Agreement

Accelerated Share Repurchase Agreement

Accelerated Share Repurchase Agreement

Restricted Stock Units (RSUs)

Restricted Stock Units (RSUs)

Restricted Stock Units (RSUs)

Restricted Stock Units (RSUs)

Restricted Stock Units (RSUs)

Restricted Stock Units (RSUs)

Restricted Stock Units (RSUs)

Employee Stock Purchase Plan

Employee Stock Purchase Plan

Employee Stock Purchase Plan

Employee Stock Purchase Plan

Stock Options and Awards Activity

Stock Options and Awards Activity

Stock Options and Awards Activity

Stock Options and Awards Activity

Employee Stock Option Plans

Performance Based Restricted Stock Units

2008 Equity Incentive Plan

2008 Equity Incentive Plan

2008 Equity Incentive Plan

2008 Equity Incentive Plan

Month

Minimum

Maximum

Restricted Stock Units (RSUs)

Restricted Stock Units (RSUs)

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of vesting upon first anniversary of commencement date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25.00%

'

'

Remaining portion vesting over the final years of the vesting period.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

75.00%

'

'

Final vesting period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'36 months

'

'

Award vesting period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'4 years 3 months 18 days

'

'

'1 year

'4 years

Employee Stock Purchase Plan discount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

85.00%

'

'

'

Employee Stock Purchase Plan offering period (in months)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6

'

'

'

Shares purchased under Employee Stock Purchase Plan (ESPP) program (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

349,906

414,927

915,984

932,537

'

'

'

'

'

'

'

'

'

'

Total unrecognized compensation expense

'

'

'

'

'

'

'

'

'

'

'

$11,800,000

'

$11,800,000

'

$11,800,000

'

$0.40

'

$0.40

'

'

'

'

'

$4,800,000

'

'

'

'

'

Period unamortized compensation expense will be recognized

'

'

'

'4 months 15 days

'

'

'

'

'

'

'

'

'

'

'

'2 years 6 months 26 days

'

'

'

'

'

'

'

'

'

'2 years 4 months 13 days

'

'

'

'

'

Pre-tax intrinsic value of stock options

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

350,000

91,000

502,000

274,000

'

'

'

'

'

'

Restricted stock units granted to options available for grant reduction coefficient (shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.5

'

'

Number of RSU's outstanding

'

'

3,630,000

3,630,000

'

2,794,000

'

'

'

'

'

3,630,381

'

3,630,381

'

3,630,381

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of RSU's expected to vest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,705,578

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate fair value of awards vested

'

'

'

'

'

'

'

'

'

'

'

1,500,000

'

'

'

5,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Grant date fair value of options vested

'

'

'

'

'

'

'

'

'

'

'

1,200,000

'

'

'

5,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Market-based restricted stock units

'

'

228,375

228,375

'

'

'

'

'

'

'

'

'

'

'

'

331,500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of shares vesting on each anniversary

'

'

'

'

'

'

'

'

'

'

25.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise price range lower limit

'

'

'

'

'

'

'

'

'

'

$4.52

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise price range higher limit

'

'

'

'

'

'

'

'

'

'

$5.39

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Grant-date fair value

'

'

'

'

'

'

'

'

'

'

1,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,700,000

'

'

'

'

Performance-based restricted stock units granted

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

875,000

'

'

'

'

Repurchase of common stock shares

'

'

'

'

'

'

300,383

750,000

'

5,072,463

'

101,123

43,988

364,826

436,708

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repurchase of common stock value

'

'

'

1,905,000

2,120,000

'

'

'

'

30,000,000

'

600,000

205,000

1,900,000

2,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock authorized amount

50,000,000

50,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Remaining authorized repurchase amount

10,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repurchase of common stock, average price per shares

'

'

'

'

'

'

'

'

$4.90

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock repurchased

'

'

255,963

1,306,346

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock repurchased value

'

'

$1,400,000

$6,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Average exercise price per share

'

'

$5.40

$5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Provision_for_Income_Taxes_Add

Provision for Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Examination [Line Items]	'	'	'	'
Income tax expense	$1,488,000	$2,464,000	$5,118,000	$8,521,000
Effective tax rate	14.10%	24.30%	28.50%	124.10%
Statutory federal income tax rate	'	'	35.00%	35.00%
Accrued additional interest related to unrecognized tax benefits	3,000	56,000	70,000	162,000
Additional interest related to unrecognized tax benefits	$1,000,000	'	'	'

Customer_and_Geographic_Inform2

Customer and Geographic Information - Revenue by Geographic Area Based on Bill to Location (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues From External Customers And Long Lived Assets [Line Items]	'	'	'	'
Total revenue	$79,311	$73,919	$215,029	$192,760
Billing location | United States	'	'	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'	'	'
Total revenue	39,406	33,001	104,093	77,693
Billing location | Taiwan	'	'	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'	'	'
Total revenue	10,885	16,340	31,715	46,317
Billing location | Japan	'	'	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'	'	'
Total revenue	8,532	10,095	27,179	30,037
Billing location | Europe	'	'	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'	'	'
Total revenue	7,794	3,658	19,744	11,169
Billing location | China	'	'	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'	'	'
Total revenue	7,345	5,531	19,141	13,844
Billing location | Korea	'	'	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'	'	'
Total revenue	4,808	4,778	11,871	12,400
Billing location | Others	'	'	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'	'	'
Total revenue	$541	$516	$1,286	$1,300

Customer_and_Geographic_Inform3

Customer and Geographic Information - Revenue by its Primary Markets (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Entity Wide Information Revenue From External Customer [Line Items]	'	'	'	'
Revenue	$79,311	$73,919	$215,029	$192,760
Mobile	'	'	'	'
Entity Wide Information Revenue From External Customer [Line Items]	'	'	'	'
Revenue	43,938	38,712	122,148	90,839
Consumer Electronics	'	'	'	'
Entity Wide Information Revenue From External Customer [Line Items]	'	'	'	'
Revenue	18,525	18,631	48,166	51,674
Personal Computers	'	'	'	'
Entity Wide Information Revenue From External Customer [Line Items]	'	'	'	'
Revenue	3,874	4,854	10,045	14,166
Total Product Revenue	'	'	'	'
Entity Wide Information Revenue From External Customer [Line Items]	'	'	'	'
Revenue	66,337	62,197	180,359	156,679
Licensing	'	'	'	'
Entity Wide Information Revenue From External Customer [Line Items]	'	'	'	'
Revenue	$12,974	$11,722	$34,670	$36,081

Customer_and_Geographic_Inform4

Customer and Geographic Information - Revenue by Customers (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Samsung Electronics	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
Revenue by customers (percentage)	45.20%	38.30%	43.00%	34.50%
Weikeng	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
Revenue by customers (percentage)	10.20%	9.60%	8.80%	8.40%
Edom Technology	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
Revenue by customers (percentage)	5.40%	10.70%	6.80%	11.40%

Customer_and_Geographic_Inform5

Customer and Geographic Information - Property and Equipment by Physical Location (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Revenues From External Customers And Long Lived Assets [Line Items]	'	'
Net book value	$14,381	$14,840
United States	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'
Net book value	6,773	6,519
China	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'
Net book value	4,936	4,834
Taiwan	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'
Net book value	1,265	1,586
India	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'
Net book value	1,172	1,509
Others	'	'
Revenues From External Customers And Long Lived Assets [Line Items]	'	'
Net book value	$235	$392

Customer_and_Geographic_Inform6

Customer and Geographic Information - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Customer

Customer

Customer

Customer

Customer

Consumer Electronics

Consumer Electronics

Consumer Electronics

Consumer Electronics

Reclassifications

Reclassifications

Top Five Customer

Top Five Customer

Top Five Customer

Top Five Customer

Accounts Receivable

Accounts Receivable

Segment

Consumer Electronics

Consumer Electronics

Customer Concentration Risk

Customer Concentration Risk

Customer A

Customer D

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of reportable segments

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Customer risk percentage

'

'

'

'

'

'

'

'

'

'

'

72.10%

68.30%

69.00%

65.00%

45.00%

24.00%

Number of customers across risk threshold

5

5

5

5

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of customers on accounts receivable

1

'

1

'

1

'

'

'

'

'

'

'

'

'

'

'

'

Revenue

$79,311

$73,919

$215,029

$192,760

'

$18,525

$18,631

$48,166

$51,674

$800

$1,400

'

'

'

'

'

'