Tessera (TSRA) 10-Q 5 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 24, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	TESSERA TECHNOLOGIES INC
Trading Symbol	TSRA
Entity Central Index Key	1261694
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		52,614,664

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$17,306	$50,908
Short-term investments	417,968	383,513
Accounts receivable, net	4,907	4,478
Current deferred tax assets	15,891	19,334
Other current assets	13,685	17,277
Total current assets	469,757	475,510
Intangible assets, net	69,829	72,925
Long-term deferred tax assets	21,825	21,759
Other assets	6,627	6,929
Total assets	568,038	577,123
Current liabilities:
Accounts payable	1,454	3,509
Accrued legal fees	3,564	4,143
Accrued liabilities	7,515	16,157
Deferred revenue	9,919	10,217
Total current liabilities	22,452	34,026
Long-term deferred tax and other liabilities	2,138	1,738
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock: $0.001 par value; 10,000 shares authorized and no shares issued and outstanding	0	0
Common stock: $0.001 par value; 150,000 shares authorized; 58,299 and 57,800 shares issued, respectively, and 52,540 and 52,840 shares outstanding, respectively	58	58
Additional paid-in capital	584,883	576,341
Treasury stock at cost; 5,759 and 4,960 shares of common stock at each period end, respectively	-138,257	-106,231
Accumulated other comprehensive income (loss)	183	-333
Retained earnings	96,581	71,524
Total stockholders’ equity	543,448	541,359
Total liabilities and stockholders’ equity	$568,038	$577,123

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$0.00	$0.00
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	58,299,000	57,800,000
Common stock, shares outstanding	52,540,000	52,840,000
Treasury stock, shares	5,759,000	4,960,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements Of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Royalty and license fees	$79,850	$88,336
Total revenues	79,850	88,336
Operating expenses:
Cost of revenues	142	8
Research, development and other related costs	7,368	7,532
Selling, general and administrative	10,996	12,422
Amortization expense	4,696	4,603
Litigation expense	4,504	6,951
Restructuring, impairment of long-lived assets and other charges	0	1,039
Total operating expenses	27,706	32,555
Operating income	52,144	55,781
Other income and expense, net	647	330
Income before taxes from continuing operations	52,791	56,111
Provision for income taxes	17,224	22,686
Income from continuing operations	35,567	33,425
Income (loss) from discontinued operations, net of tax	28	-12,527
Net income	$35,595	$20,898
Income from continuing operations:
Basic (in dollars per share)	$0.68	$0.63
Diluted (in dollars per share)	$0.66	$0.62
Income (loss) from discontinued operations:
Basic (in dollars per share)	$0	($0.24)
Diluted (in dollars per share)	$0	($0.23)
Net income:
Basic (in dollars per share)	$0.68	$0.39
Diluted (in dollars per share)	$0.66	$0.39
Cash dividends declared per share (in dollars per share)	$0.20	$0.10
Weighted average number of shares used in per share calculations-basic	52,559	53,223
Weighted average number of shares used in per share calculations-diluted	53,534	53,793

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements Of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$35,595	$20,898
Other comprehensive income (loss):
Net unrealized gains (losses) on available-for- sale securities, net of tax	516	-83
Other comprehensive income (loss)	516	-83
Comprehensive income	$36,111	$20,815

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements Of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$35,595	$20,898
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization of property and equipment	424	527
Amortization of intangible assets	4,696	4,604
Stock-based compensation expense	2,007	3,504
Non-cash restructuring, impairment of long-lived assets and other charges	0	595
Deferred income tax and other, net	3,377	28
Amortization of discount on investments and other	-3	-488
Patents received through settlement agreements	0	-1,591
Changes in operating assets and liabilities:
Accounts receivable, net	-429	579
Other assets	3,787	1,490
Accounts payable	-2,321	-897
Accrued legal fees	-876	-1,484
Accrued and other liabilities	-7,680	5,953
Deferred revenue	-298	-53
Net cash from operating activities	38,279	33,665
Cash flows from investing activities:
Purchases of property and equipment	-317	-1,004
Purchases of short-term available-for-sale investments	-168,520	-89,109
Proceeds from maturities and sales of short-term and long-term investments	134,584	70,669
Purchases of intangible assets	-1,600	-3,100
Net cash from investing activities	-35,853	-22,544
Cash flows from financing activities:
Dividend paid	-10,538	-5,319
Proceeds from exercise of stock options	5,650	7,910
Proceeds from employee stock purchase program	886	1,102
Repurchase of common stock	-32,026	-14,232
Net cash from financing activities	-36,028	-10,539
Net decrease in cash and cash equivalents	-33,602	582
Cash and cash equivalents at beginning of period	50,908	73,722
Cash and cash equivalents at end of period	$17,306	$74,304

The_Company_And_Basis_Of_Prese

The Company And Basis Of Presentation	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company And Basis Of Presentation	THE COMPANY AND BASIS OF PRESENTATION
	Tessera Technologies, Inc. and its subsidiaries (the “Company”) generate revenue from licensing its technologies and intellectual property to customers and others who implement it for use in areas such as mobile computing and communications, memory and data storage, and 3-D Integrated Circuit (“3DIC”) technologies, among others. The Company's technologies include semiconductor packaging and interconnect solutions, and products and solutions for mobile and computational imaging, including our FaceToolsTM, FacePowerTM, FotoSavvyTM, DigitalApertureTM, face beautification, red-eye removal, High Dynamic Range, autofocus, panorama, and image stabilization intellectual property.
	The accompanying interim unaudited condensed consolidated financial statements as of March 31, 2015 and 2014, and for the three months then ended, have been prepared by the Company in accordance with generally accepted accounting principles (“GAAP”) in the United States (“U.S.”) for interim financial information. The amounts as of December 31, 2014 have been derived from the Company’s annual audited financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments necessary (consisting of normal recurring adjustments) to state fairly the financial position of the Company and its results of operations and cash flows as of and for the periods presented. These financial statements should be read in conjunction with the annual audited financial statements and notes thereto as of and for the year ended December 31, 2014, included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014, filed on February 25, 2015 (the “Form 10-K”).
	The results of operations for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the full year ended December 31, 2015 or any future period and the Company makes no representations related thereto.
	Reclassification
	Certain reclassifications have been made to prior period balances in order to conform to the current period’s presentation.

Summary_Of_Significant_Account

Summary Of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	There have been no significant changes in the Company’s significant accounting policies during the three months ended March 31, 2015, as compared to the significant accounting policies described in the Form 10-K.
	Recent Accounting Pronouncements
	In June 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (“ASU 2014-12”). The amendments in ASU 2014-12 require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in Accounting Standards Codification Topic No. 718, “Compensation - Stock Compensation” (“ASC 718”), as it relates to awards with performance conditions that affect vesting to account for such awards. The amendments in ASU 2014-12 are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. Entities may apply the amendments in ASU 2014-12 either: (a) prospectively to all awards granted or modified after the effective date; or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The adoption of ASU 2014-12 is not expected to have a material effect on the Company’s unaudited condensed consolidated financial statements or disclosures.
	In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers" (“ASU 2014-09”), which provides guidance for revenue recognition. ASU 2014-09 affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets and supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” and most industry-specific guidance. This ASU also supersedes some cost guidance included in Subtopic 605-35, “Revenue Recognition-Construction-Type and Production-Type Contracts.” ASU 2014-09’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which a company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under today’s guidance, including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. ASU 2014-09 is effective for the Company beginning January 1, 2017 and, at that time, the Company may adopt the new standard under the full retrospective approach or the modified retrospective approach. Early adoption is not permitted. The Company is currently evaluating the method and impact the adoption of ASU 2014-09 will have on the Company’s unaudited condensed consolidated financial statements and disclosures.

Composition_Of_Certain_Financi

Composition Of Certain Financial Statement Captions	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Composition Of Certain Financial Statement Captions	COMPOSITION OF CERTAIN FINANCIAL STATEMENT CAPTIONS
	Other current assets consisted of the following (in thousands):
		31-Mar-15		31-Dec-14
	Prepaid income taxes	$	8,933	$	12,841
	Interest receivable	2,566		2,138
	Other	2,186		2,298
		$	13,685	$	17,277
	Accrued liabilities consisted of the following (in thousands):
		31-Mar-15		31-Dec-14
	Employee compensation and benefits	$	4,404	$	10,734
	Other	3,111		5,423
		$	7,515	$	16,157
	Accumulated other comprehensive income (loss) consisted of the following (in thousands):
		31-Mar-15		31-Dec-14
	Unrealized gains and losses on available-for-sale securities, net of tax	$	183	$	(333	)
		$	183	$	(333	)

Financial_Instruments

Financial Instruments	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Financial Instruments	FINANCIAL INSTRUMENTS
	The following is a summary of marketable securities at March 31, 2015 and December 31, 2014 (in thousands):
		31-Mar-15
		Cost		Gross			Gross			Estimated
				Unrealized			Unrealized			Fair
				Gains			Losses			Values
	Available-for-sale securities
	Corporate bonds and notes	$	306,226	$	203		$	(201	)	$	306,228
	Municipal bonds and notes	61,166		24			(29		)	61,161
	Commercial paper	9,959		4			—			9,963
	Treasury and agency notes and bills	40,888		19			(16		)	40,891
	Money market funds	2,554		—			—			2,554
	Total available-for-sale securities	$	420,793	$	250		$	(246	)	$	420,797
	Reported in:
	Cash and cash equivalents									$	2,829
	Short-term investments									417,968
	Total marketable securities									$	420,797
		31-Dec-14
		Cost		Gross			Gross			Estimated
				Unrealized			Unrealized			Fair
				Gains			Losses			Values
	Available-for-sale securities
	Corporate bonds and notes	$	282,279	$	13		$	(538	)	$	281,754
	Municipal bonds and notes	37,201		15			(1		)	37,215
	Treasury and agency notes and bills	41,271		10			(13		)	41,268
	Commercial paper	33,774		2			(1		)	33,775
	Money market funds	20,883		—			—			20,883
	Total available-for-sale securities	$	415,408	$	40		$	(553	)	$	414,895
	Reported in:
	Cash and cash equivalents									$	31,382
	Short-term investments									383,513
	Total marketable securities									$	414,895
	At March 31, 2015 and December 31, 2014, the Company had $435.3 million and $434.4 million, respectively, in cash, cash equivalents and short-term investments. The majority of these amounts were held in marketable securities, as shown above. The remaining balance of $14.5 million and $19.5 million at March 31, 2015 and December 31, 2014, respectively, was cash held in operating accounts not included in the tables above.
	The gross realized gains and losses on sales of marketable securities were not significant during the three months ended March 31, 2015 and 2014.
	Unrealized losses and unrealized gains were $(0.2) million and $0.2 million, respectively, net of tax, as of March 31, 2015. These amounts were related to temporary fluctuations in value of the remaining available-for-sale securities and were due primarily to changes in interest rates and market and credit conditions of the underlying securities. Certain investments with a temporary decline in value are not considered to be other-than-temporarily impaired as of March 31, 2015 because the Company has the ability to hold these investments to allow for recovery, does not anticipate having to sell these securities with unrealized losses and continues to receive interest at the maximum contractual rate. For the three months ended March 31, 2015 and 2014, respectively, the Company did not record any impairment charges related to its marketable securities.
	The following table summarizes the fair value and gross unrealized losses related to individual available-for-sale securities at March 31, 2015 and December 31, 2014, which have been in a continuous unrealized loss position, aggregated by investment category and length of time (in thousands):
	31-Mar-15	Less Than 12 Months					12 Months or More						Total
		Fair Value		Gross			Fair			Gross			Fair Value		Gross
				Unrealized			Value			Unrealized					Unrealized
				Losses						Losses					Losses
	Corporate bonds and notes	$	146,902	$	(182	)	$	42,834		$	(19	)	$	189,736	$	(201	)
	Treasury and agency notes and bills	20,166		(16		)	—			—			20,166		(16		)
	Municipal bonds and notes	26,490		(29		)	—			—			26,490		(29		)
	Commercial paper	998		—			—			—			998		—
	Total	$	194,556	$	(227	)	$	42,834		$	(19	)	$	237,390	$	(246	)
	31-Dec-14	Less Than 12 Months					12 Months or More						Total
		Fair Value		Gross			Fair			Gross			Fair Value		Gross
				Unrealized			Value			Unrealized					Unrealized
				Losses						Losses					Losses
	Corporate bonds and notes	$	240,165	$	(535	)	$	5,453		$	(3	)	$	245,618	$	(538	)
	Municipal bonds and notes	1,061		(1		)	—			—			1,061		(1		)
	Commercial paper	9,482		(1		)	—			—			9,482		(1		)
	Treasury and agency notes and bills	16,245		(13		)	—			—			16,245		(13		)
	Total	$	266,953	$	(550	)	$	5,453		$	(3	)	$	272,406	$	(553	)
	The estimated fair value of marketable securities by contractual maturity at March 31, 2015 is shown below (in thousands). Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.
		Estimated
		Fair Value
	Due in one year or less	$	172,100
	Due in one to two years	138,436
	Due in two to three years	110,261
	Total	$	420,797

Discontinued_Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS
	In the first quarter of 2014, the Company announced the cessation of all mems|cam manufacturing operations. This was the last manufacturing operation in the DigitalOptics business and for the entire Company. This action, which occurred primarily during the first half of 2014, included a reduction of over 300 employees and the closure of facilities in Arcadia, California, Rochester, New York and in Taiwan and Japan as is substantially complete as of March 31, 2015.
	For more information regarding these actions, see Note 14 – "Restructuring, Impairment of Long-Lived Assets and Other Charges."
	The Company has reported the results of operations and financial position of this business in discontinued operations within the Condensed Consolidated Statements of Operations for all periods presented. Assets and liabilities of discontinued operations are not material as of December 31, 2014 and March 31, 2015 and are, therefore, included in other line items on the Condensed Consolidated Balance Sheets. See below for more information regarding balance sheet classification.
	The results from discontinued operations were as follows (in thousands):
		Three Months Ended
		31-Mar-15				31-Mar-14
	Revenues:
	Product and service revenues	$	—			$	—
	Total revenues	—				—
	Operating expenses:
	Cost of revenues	—				19
	Research, development and other related costs	—				5,112
	Selling, general and administrative	389				2,237
	Restructuring, impairment of long-lived assets and other charges	(371		)		4,116			(1	)
	Impairment of goodwill	—				—
	Total operating expenses	18				11,484
	Operating loss before taxes	(18		)		(11,484		)
	Other income and expense, net	—				180
	Provision for (benefit from) income taxes	(46		)		1,223
	Net income (loss) from discontinued operations	$	28			$	(12,527	)
	(1) As noted above, in January 2014, the Company announced the cessation of all mems|cam manufacturing operations. As part of these actions, the Company incurred severance and accelerated lease obligations and other charges. See Note 14 for additional information.
	The current assets and current liabilities of discontinued operations were as follows (in thousands):
		31-Mar-15				31-Dec-14
	Accounts receivable and other assets, net	$	—		-1	$	390		-2
	Total current assets of discontinued operations	$	—			$	390
	Accrued liabilities	—			-1	2,873			-3
	Total current liabilities of discontinued operations	$	—			$	2,873
	(1) As of March 31, 2015, the activities related to the discontinued operations described above have been substantially completed. Consequently, all balance sheet items have been written off, disposed of or settled.
	(2) This amount is included in "Other current assets" on the condensed consolidated balance sheet.
	(3) This amount is included in "Accrued liabilities" on the condensed consolidated balance sheet.

Fair_Value

Fair Value	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE
	The Company follows the authoritative guidance fair value measurement and the fair value option for financial assets and financial liabilities. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability, or an exit price, in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The established fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:
	Level 1		Quoted prices in active markets for identical assets.
	Level 2		Observable market-based inputs or unobservable inputs that are corroborated by market data.
	Level 3		Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.
	When applying fair value principles in the valuation of assets, we are required to maximize the use of quoted market prices and minimize the use of unobservable inputs. We calculate the fair value of our Level 1 and Level 2 instruments based on the exchange traded price of similar or identical instruments, where available, or based on other observable inputs. There were no significant transfers into or out of Level 1 or Level 2 that occurred between December 31, 2014 and March 31, 2015.
	The following is a list of the Company’s assets required to be measured at fair value on a recurring basis and where they were classified within the hierarchy as of March 31, 2015 (in thousands):
		Fair Value			Quoted		Significant		Significant
					Prices in		Other		Unobservable
					Active Markets		Observable		Inputs
					for Identical		Inputs		(Level 3)
					Assets		(Level 2)
					(Level 1)
	Assets
	Marketable Securities
	Money market funds (1)	$	2,554		$	2,554	$	—	$	—
	Corporate bonds and notes (2)	306,228			—		306,228		—
	Municipal bonds and notes (2)	61,161			—		61,161		—
	Treasury and agency notes and bills (2)	40,891			—		40,891		—
	Commercial paper (3)	9,963			—		9,963		—
	Total Assets	$	420,797		$	2,554	$	418,243	$	—
	The following footnotes indicate where the noted items were recorded in the Condensed Consolidated Balance Sheet at March 31, 2015:
	-1	Reported as cash and cash equivalents.
	-2	Reported as short-term investments.
	-3	Reported as either cash and cash equivalents or short-term investments.
	The following is a list of the Company’s assets required to be measured at fair value on a recurring basis and where they were classified within the hierarchy as of December 31, 2014 (in thousands):
		Fair Value			Quoted		Significant		Significant
					Prices in		Other		Unobservable
					Active Markets		Observable		Inputs
					for Identical		Inputs		(Level 3)
					Assets		(Level 2)
					(Level  1)
	Assets
	Marketable Securities
	Money market funds (1)	$	20,883		$	20,883	$	—	$	—
	Corporate bonds and notes (2)	281,754			—		281,754		—
	Municipal bonds and notes (2)	37,215			—		37,215		—
	Treasury and agency notes and bills (2)	41,268			—		41,268		—
	Commercial paper (3)	33,775			—		33,775		—
	Total Assets	$	414,895		$	20,883	$	394,012	$	—
	The following footnotes indicate where the noted items were recorded in the Condensed Consolidated Balance Sheet at December 31, 2014:
	-1	Reported as cash and cash equivalents.
	-2	Reported as short-term investments.
	-3	Reported as either cash and cash equivalents or short-term investments.
	Non-Recurring Fair Value Measurements
	The following table represents the activity in level 3 assets (in thousands):
		Patent Assets
	Balance at December 31, 2014	$	4,280	(1	)
	Asset additions	—
	Assets sold	—
	Assets received	—
	Balance at March 31, 2015	$	4,280
	(1) This amount represents the value of the patents that were received in 2014 as part of settlement agreements reached with parties to resolve prior disputes. These assets were valued using a methodology based on an arms-length purchase price of bulk patent assets, with adjustments based on limited pick rights, the total available market, and remaining average patent life. The value above is gross and the accumulated amortization to date is $0.5 million.

Identified_Intangible_Assets

Identified Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Identified Intangible Assets	IDENTIFIED INTANGIBLE ASSETS
	Identified intangible assets consisted of the following (in thousands):
				31-Mar-15							31-Dec-14
		Average		Gross		Accumulated			Net		Gross		Accumulated			Net
		Life		Assets		Amortization					Assets		Amortization
		(Years)
	Acquired patents / core technology	15-Mar		$	133,757	$	(66,315	)	$	67,442	$	132,157	$	(62,053	)	$	70,104
	Existing technology	10-May		18,920		(18,341		)	579		18,700		(17,932		)	768
	Customer contracts	9-Mar		8,600		(6,808		)	1,792		8,600		(6,569		)	2,031
	Trade name	10-Apr		300		(284		)	16		520		(498		)	22
				$	161,577	$	(91,748	)	$	69,829	$	159,977	$	(87,052	)	$	72,925
	Amortization expense for the three months ended March 31, 2015 and 2014 amounted to $4.7 million and $4.6 million, respectively.
	As of March 31, 2015, the estimated future amortization expense of intangible assets is as follows (in thousands):
	2015 (remaining 9 months)	$	13,945
	2016	17,825
	2017	15,550
	2018	13,768
	2019	5,334
	Thereafter	3,407
		$	69,829

Net_Income_Loss_Per_Share

Net Income (Loss) Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	NET INCOME (LOSS) PER SHARE
	The Company has a share-based compensation plan under which employees may be granted share-based awards including shares of restricted stock and restricted stock units ("RSUs"). Non-forfeitable dividends are paid on unvested shares of restricted stock. No dividends are accrued or paid on unvested RSUs. As such, shares of restricted stock are considered participating securities under the two-class method of calculating earnings per share. The two-class method of calculating earnings per share did not have a material impact on the Company’s earnings per share calculation for the three months ended March 31, 2015 and 2014.
	The following table sets forth the computation of basic and diluted shares (in thousands):
		Three Months Ended
		31-Mar-15		31-Mar-14
	Denominator:
	Weighted average common shares outstanding	52,614		53,320
	Less: Unvested common shares subject to repurchase	(55	)	(97	)
	Total common shares-basic	52,559		53,223
	Effect of dilutive securities:
	Stock awards	433		333
	Restricted stock awards and units	542		237
	Total common shares-diluted	53,534		53,793
	Basic net income (loss) per share is computed using the weighted average number of common shares outstanding during the period, excluding any unvested restricted stock awards that are subject to repurchase. Diluted net income (loss) per share is computed using the treasury stock method to calculate the weighted average number of common shares and, if dilutive, potential common shares outstanding during the period. Potential dilutive common shares include unvested restricted stock awards and units and incremental common shares issuable upon the exercise of stock options, less shares from assumed proceeds. The assumed proceeds calculation includes actual proceeds to be received from the employee upon exercise, the average unrecognized stock compensation cost during the period and any tax benefits that will be credited upon exercise to additional paid-in capital.
	For the three months ended March 31, 2015 and 2014, in the calculation of net income per share, 1.1 million and 2.2 million shares, respectively, subject to stock options and restricted stock awards and units were excluded from the computation of diluted net income per share as they were anti-dilutive.

Stockholders_Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stockholders' Equity	STOCKHOLDERS’ EQUITY
	Stock Repurchase Programs
	In August 2007, the Company’s Board of Directors (“the Board”) authorized a plan to repurchase the Company’s outstanding shares of common stock dependent on market conditions, share price and other factors. As of March 31, 2015, the amount authorized under this plan to be used for repurchases is $250.0 million. As of March 31, 2015, the Company had repurchased a total of approximately 5,623,000 shares of common stock, since inception of the plan, at an average price of $23.81 per share for a total cost of $133.9 million. As of December 31, 2014, the Company had repurchased a total of approximately 4,901,000 shares of common stock, since inception of the plan, at an average price of $21.39 per share for a total cost of $104.9 million. The shares repurchased are recorded as treasury stock and are accounted for under the cost method. No expiration date has been specified for this plan. As of March 31, 2015, the total amount available for repurchase was $116.1 million. The Company plans to continue to execute authorized repurchases from time to time under the plan.
	Stock Option Plans
	The 2003 Plan
	As of March 31, 2015, there were approximately 4.3 million shares reserved for future grant under the 2003 Plan.
	A summary of the stock option activity is presented below (in thousands, except per share amounts):
		Options Outstanding
		Number of		Weighted
		Shares Subject to Options		Average
				Exercise
				Price Per
				Share
	Balance at December 31, 2014	1,616		$19.34
	Options granted	10		$37.11
	Options exercised	(289	)	$19.55
	Options canceled / forfeited / expired	(61	)	$17.39
	Balance at March 31, 2015	1,276		$19.53
	Restricted Stock Awards and Units
	Information with respect to outstanding restricted stock awards and units as of March 31, 2015 is as follows (in thousands, except per share amounts):
		Restricted Stock and Restricted Stock Units
		Number of Shares		Number of Shares		Total Number		Weighted Average
		Subject to Time-		Subject to		of Shares		Grant Date Fair
		based Vesting		Performance-				Value Per Share
				based Vesting
	Balance at December 31, 2014	502		633		1,135		$	20.3
	Awards and units granted	353		36		389		$	41.32
	Awards and units vested / earned	(29	)	(144	)	(173	)	$	20.39
	Awards and units canceled / forfeited	(20	)	(60	)	(80	)	$	17.61
	Balance at March 31, 2015	806		465		1,271		$	26.88
	Performance Awards and Units
	Performance awards and units may be granted to employees or consultants based upon, among other things, the contributions, responsibilities and other compensation of the particular employee or consultant. The value and the vesting of such performance awards and units are generally linked to one or more performance goals or other specific performance goals determined by the Company, in each case on a specified date or dates or over any period or periods determined by the Company, and range from zero to 100 percent of the grant.
	Employee Stock Purchase Plans
	As of March 31, 2015, there were approximately 530,586 shares reserved for grant under the ESPP and the International ESPP, collectively.

StockBased_Compensation_Expens

Stock-Based Compensation Expense	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Expense	STOCK-BASED COMPENSATION EXPENSE
	The effect of recording stock-based compensation expense for the three months ended March 31, 2015 and 2014 is as follows (in thousands):
		Three Months Ended
		31-Mar-15				31-Mar-14
	Cost of revenues	$	—			$	19
	Research, development and other related costs	690				916
	Selling, general and administrative	1,317				2,569
	Total stock-based compensation expense	2,007				3,504
	Tax effect on stock-based compensation expense	(486		)		(1,104		)
	Net effect on net income (loss)	$	1,521			$	2,400
	Stock-based compensation expense categorized by various equity components for the three months ended March 31, 2015 and 2014 is summarized in the table below (in thousands):
		Three Months Ended
		31-Mar-15				31-Mar-14
	Employee stock options	$	885			$	989
	Restricted stock awards and units	973				2,314
	Employee stock purchase plan	149				201
	Total stock-based compensation expense	$	2,007			$	3,504
	The following assumptions were used to value the options granted:
		Three Months Ended
		31-Mar-15			31-Mar-14
	Expected life (in years)	3.8			4.9
	Risk-free interest rate	1.4	%		1.7	%
	Dividend yield	2.9	%		3.4	%
	Expected volatility	35.5	%		41.4	%
	ESPP grants occur in February and August. The following assumptions were used to value the ESPP shares for these grants:
			Feb-15			Feb-14
	Expected life (years)		2			2
	Risk-free interest rate		0.4	%		0.3	%
	Dividend yield		3.4	%		3.4	%
	Expected volatility		30	%		31	%

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES
	The provision for income taxes for the three months ended March 31, 2015 was $17.2 million and was primarily related to foreign withholding taxes and tax liability generated from U.S. and foreign operations. The provision for income taxes for the three months ended March 31, 2014 was $22.7 million and was primarily related to foreign withholding taxes and foreign tax liability generated from foreign operations. The Company's provision for income taxes is based on its worldwide estimated annualized effective tax rate, except for jurisdictions for which a loss is expected for the year and no benefit can be realized for those losses, and the tax effect of discrete items occurring during the period. The tax for jurisdictions for which a loss is expected and no benefit can be realized for the year is based on actual taxes and tax reserves for the quarter. The decrease in the provision for income taxes for the three months ended March 31, 2015 as compared to the same period in the prior year is largely attributable to a decrease in foreign withholding taxes.
	As of March 31, 2015, unrecognized tax benefits approximated $2.6 million, of which $1.4 million would affect the effective tax rate if recognized. At December 31, 2014, unrecognized tax benefits were$2.7 million of which $1.1 million would affect the effective tax rate if recognized. It is reasonably possible that unrecognized tax benefits may decrease by a range of $1.3 million to $1.5 million in the next 12 months due to the expected lapse of statutes of limitation relating to the federal and state research tax credit, certain domestic deductions, as well as foreign tax incentives.
	It is the Company's policy to classify accrued interest and penalties related to unrecognized tax benefits in the provision for income taxes. For the three months ended March 31, 2015, the Company recognized an insignificant amount of interest and penalties related to unrecognized tax benefits. As of March 31, 2015 and December 31, 2014, the Company had accrued $0.5 million and $0.5 million, respectively, of interest and penalties related to unrecognized tax benefits.
	At March 31, 2015, the Company's 2008 through 2014 tax years were open and subject to potential examination in one or more jurisdictions. In addition, in the U.S., any net operating losses or credits that were generated in prior years but utilized in an open year may also be subject to examination. The Company recently completed an Internal Revenue Service examination related to its 2008 and 2009 tax returns which resulted in minimal changes to the statement of operations. The Company is currently in the preliminary stages of Internal Revenue Service examination for the 2010 - 2013 tax years. The Company also is currently under examination in California for the 2011 and 2012 tax years.

Commitments_And_Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES
	Lease Commitments
	The Company leases office and research facilities and office equipment under operating leases which expire at various dates through 2020. The amounts reflected in the table below are for the aggregate future minimum lease payments under non-cancelable facility and equipment operating leases. Under lease agreements that contain escalating rent provisions, lease expense is recorded on a straight-line basis over the lease term. Rent expense for the three months ended March 31, 2015 and 2014 amounted to $0.5 million and $1.0 million, respectively.
	As of March 31, 2015, future minimum lease payments are as follows (in thousands):
		Lease
		Obligations
	2015 (remaining 9 months)	$	1,767
	2016	2,209
	2017	2,255
	2018	2,292
	2019	2,129
	Thereafter	1,808
		$	12,460
	Contingencies
	For all legal proceedings, at each reporting period, the Company evaluates whether or not a potential loss amount or a potential range of loss is probable and reasonably estimable under the provisions of the authoritative guidance that addresses accounting for contingencies.
	Litigation Matters
	The Company and its subsidiaries are involved in litigation matters and claims in the normal course of business. In the past, the Company and its subsidiaries have litigated to enforce their respective patents and other intellectual property rights, to enforce the terms of license agreements, to protect trade secrets, to determine the validity and scope of the proprietary rights of others and to defend against claims of infringement or invalidity. The Company expects it or its subsidiaries will be involved in similar legal proceedings in the future, including proceedings regarding infringement of its patents and proceedings to ensure proper and full payment of royalties by licensees under the terms of its license agreements.
	The existing and any future legal actions may harm the Company’s business. For example, legal actions could cause an existing licensee or strategic partner to cease making royalty or other payments to the Company, or to challenge the validity and enforceability of patents owned by the Company’s subsidiaries or the scope of license agreements with the Company’s subsidiaries, and could significantly damage the Company’s relationship with such licensee or strategic partner and, as a result, prevent the adoption of the Company’s other technologies by such licensee or strategic partner. Litigation could also severely disrupt or shut down the business operations of licensees or strategic partners of the Company’s subsidiaries, which in turn would significantly harm ongoing relations with them and cause the Company to lose royalty revenues.
	The costs associated with legal proceedings are typically high, relatively unpredictable and not completely within the Company’s control. These costs may be materially higher than expected, which could adversely affect the Company’s operating results and lead to volatility in the price of its common stock. Whether or not determined in the Company’s favor or ultimately settled, litigation diverts managerial, technical, legal and financial resources from the Company’s business operations. Furthermore, an adverse decision in any of these legal actions could result in a loss of the Company’s proprietary rights, subject the Company to significant liabilities, require the Company to seek licenses from others, limit the value of the Company’s licensed technology or otherwise negatively impact the Company’s stock price or its business and consolidated financial position, results of operations or cash flows.

Segment_And_Geographic_Informa

Segment And Geographic Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment And Geographic Information	SEGMENT AND GEOGRAPHIC INFORMATION
	The Company operates its business in one operating segment, focused on the monetization of intellectual property, both internally developed and acquired, through royalties, licenses and other means.
	A significant portion of the Company’s revenues is derived from licensees headquartered outside of the U.S., principally in Asia, and it is expected that these revenues will continue to account for a significant portion of total revenues in future periods. The table below lists the geographic revenues from continuing operations for the periods indicated (in thousands):
		Three Months Ended,
		31-Mar-15				31-Mar-14
	Taiwan	$	34,781	44	%	$	50,627	57	%
	U.S.	25,530		32		3,885		4
	Korea	15,366		19		26,521		30
	Japan	1,644		2		5,478		6
	Other	2,529		3		1,825		3
		$	79,850	100	%	$	88,336	100	%
	For the three months ended March 31, 2015 and 2014, there were four and two customers, respectively, that each accounted for 10% or more of total revenues.

Restructuring_Impairment_of_Lo

Restructuring, Impairment of Long-Lived Assets And Other Charges	3 Months Ended
	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring, Impairment of Long-Lived Assets And Other Charges	RESTRUCTURING, IMPAIRMENT OF LONG-LIVED ASSETS AND OTHER CHARGES
	In January 2014, the Company announced the cessation of all mems|cam manufacturing operations. As part of these efforts, the Company had a workforce reduction of over 300 employees and closed facilities in Arcadia, California, Rochester, New York and in Taiwan and Japan. These actions triggered a $32.8 million impairment of manufacturing equipment, a $4.8 million impairment of intangible assets, purchase obligations of $9.8 million for inventory and equipment, and impairments of IT related assets of $2.1 million in the fourth quarter of 2013. Additionally, in the first three months of 2014, the Company incurred additional restructuring and other charges of $1.0 million of employee severance. As of December 31, 2014 these actions were substantially complete so the expenses in the three months ended March 31, 2015 were immaterial. In this document, the operations and financial results of the mems|cam operations are considered discontinued operations. For more information regarding these actions, see Note 5 - "Discontinued Operations."

Subsequent_Event

Subsequent Event	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Event	SUBSEQUENT EVENTS
	On April 29, 2015, the Board declared a cash dividend of $0.20 per share of common stock, payable on June 17, 2015 for the stockholders of record at the close of business on May 27, 2015.

Summary_Of_Significant_Account1

Summary Of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Accounting	The accompanying interim unaudited condensed consolidated financial statements as of March 31, 2015 and 2014, and for the three months then ended, have been prepared by the Company in accordance with generally accepted accounting principles (“GAAP”) in the United States (“U.S.”) for interim financial information. The amounts as of December 31, 2014 have been derived from the Company’s annual audited financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments necessary (consisting of normal recurring adjustments) to state fairly the financial position of the Company and its results of operations and cash flows as of and for the periods presented. These financial statements should be read in conjunction with the annual audited financial statements and notes thereto as of and for the year ended December 31, 2014, included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014, filed on February 25, 2015 (the “Form 10-K”).
Reclassification	Reclassification
	Certain reclassifications have been made to prior period balances in order to conform to the current period’s presentation.
New Accounting Pronouncement	Recent Accounting Pronouncements
	In June 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (“ASU 2014-12”). The amendments in ASU 2014-12 require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in Accounting Standards Codification Topic No. 718, “Compensation - Stock Compensation” (“ASC 718”), as it relates to awards with performance conditions that affect vesting to account for such awards. The amendments in ASU 2014-12 are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. Entities may apply the amendments in ASU 2014-12 either: (a) prospectively to all awards granted or modified after the effective date; or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The adoption of ASU 2014-12 is not expected to have a material effect on the Company’s unaudited condensed consolidated financial statements or disclosures.
	In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers" (“ASU 2014-09”), which provides guidance for revenue recognition. ASU 2014-09 affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets and supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” and most industry-specific guidance. This ASU also supersedes some cost guidance included in Subtopic 605-35, “Revenue Recognition-Construction-Type and Production-Type Contracts.” ASU 2014-09’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which a company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under today’s guidance, including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. ASU 2014-09 is effective for the Company beginning January 1, 2017 and, at that time, the Company may adopt the new standard under the full retrospective approach or the modified retrospective approach. Early adoption is not permitted. The Company is currently evaluating the method and impact the adoption of ASU 2014-09 will have on the Company’s unaudited condensed consolidated financial statements and disclosures.

Composition_Of_Certain_Financi1

Composition Of Certain Financial Statement Captions (Tables)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Current Assets	Other current assets consisted of the following (in thousands):
		31-Mar-15		31-Dec-14
	Prepaid income taxes	$	8,933	$	12,841
	Interest receivable	2,566		2,138
	Other	2,186		2,298
		$	13,685	$	17,277
Accrued Liabilities	Accrued liabilities consisted of the following (in thousands):
		31-Mar-15		31-Dec-14
	Employee compensation and benefits	$	4,404	$	10,734
	Other	3,111		5,423
		$	7,515	$	16,157
Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive income (loss) consisted of the following (in thousands):
		31-Mar-15		31-Dec-14
	Unrealized gains and losses on available-for-sale securities, net of tax	$	183	$	(333	)
		$	183	$	(333	)

Financial_Instruments_Tables

Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Summary of Marketable Securities	The following is a summary of marketable securities at March 31, 2015 and December 31, 2014 (in thousands):
		31-Mar-15
		Cost		Gross			Gross			Estimated
				Unrealized			Unrealized			Fair
				Gains			Losses			Values
	Available-for-sale securities
	Corporate bonds and notes	$	306,226	$	203		$	(201	)	$	306,228
	Municipal bonds and notes	61,166		24			(29		)	61,161
	Commercial paper	9,959		4			—			9,963
	Treasury and agency notes and bills	40,888		19			(16		)	40,891
	Money market funds	2,554		—			—			2,554
	Total available-for-sale securities	$	420,793	$	250		$	(246	)	$	420,797
	Reported in:
	Cash and cash equivalents									$	2,829
	Short-term investments									417,968
	Total marketable securities									$	420,797
		31-Dec-14
		Cost		Gross			Gross			Estimated
				Unrealized			Unrealized			Fair
				Gains			Losses			Values
	Available-for-sale securities
	Corporate bonds and notes	$	282,279	$	13		$	(538	)	$	281,754
	Municipal bonds and notes	37,201		15			(1		)	37,215
	Treasury and agency notes and bills	41,271		10			(13		)	41,268
	Commercial paper	33,774		2			(1		)	33,775
	Money market funds	20,883		—			—			20,883
	Total available-for-sale securities	$	415,408	$	40		$	(553	)	$	414,895
	Reported in:
	Cash and cash equivalents									$	31,382
	Short-term investments									383,513
	Total marketable securities									$	414,895
Schedule of Gross Unrealized Losses on Investments	The following table summarizes the fair value and gross unrealized losses related to individual available-for-sale securities at March 31, 2015 and December 31, 2014, which have been in a continuous unrealized loss position, aggregated by investment category and length of time (in thousands):
	31-Mar-15	Less Than 12 Months					12 Months or More						Total
		Fair Value		Gross			Fair			Gross			Fair Value		Gross
				Unrealized			Value			Unrealized					Unrealized
				Losses						Losses					Losses
	Corporate bonds and notes	$	146,902	$	(182	)	$	42,834		$	(19	)	$	189,736	$	(201	)
	Treasury and agency notes and bills	20,166		(16		)	—			—			20,166		(16		)
	Municipal bonds and notes	26,490		(29		)	—			—			26,490		(29		)
	Commercial paper	998		—			—			—			998		—
	Total	$	194,556	$	(227	)	$	42,834		$	(19	)	$	237,390	$	(246	)
	31-Dec-14	Less Than 12 Months					12 Months or More						Total
		Fair Value		Gross			Fair			Gross			Fair Value		Gross
				Unrealized			Value			Unrealized					Unrealized
				Losses						Losses					Losses
	Corporate bonds and notes	$	240,165	$	(535	)	$	5,453		$	(3	)	$	245,618	$	(538	)
	Municipal bonds and notes	1,061		(1		)	—			—			1,061		(1		)
	Commercial paper	9,482		(1		)	—			—			9,482		(1		)
	Treasury and agency notes and bills	16,245		(13		)	—			—			16,245		(13		)
	Total	$	266,953	$	(550	)	$	5,453		$	(3	)	$	272,406	$	(553	)
Estimated Fair Value of Marketable Securities by Contractual Maturity	The estimated fair value of marketable securities by contractual maturity at March 31, 2015 is shown below (in thousands). Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.
		Estimated
		Fair Value
	Due in one year or less	$	172,100
	Due in one to two years	138,436
	Due in two to three years	110,261
	Total	$	420,797

Discontinued_Operations_Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	The results from discontinued operations were as follows (in thousands):
		Three Months Ended
		31-Mar-15				31-Mar-14
	Revenues:
	Product and service revenues	$	—			$	—
	Total revenues	—				—
	Operating expenses:
	Cost of revenues	—				19
	Research, development and other related costs	—				5,112
	Selling, general and administrative	389				2,237
	Restructuring, impairment of long-lived assets and other charges	(371		)		4,116			(1	)
	Impairment of goodwill	—				—
	Total operating expenses	18				11,484
	Operating loss before taxes	(18		)		(11,484		)
	Other income and expense, net	—				180
	Provision for (benefit from) income taxes	(46		)		1,223
	Net income (loss) from discontinued operations	$	28			$	(12,527	)
	(1) As noted above, in January 2014, the Company announced the cessation of all mems|cam manufacturing operations. As part of these actions, the Company incurred severance and accelerated lease obligations and other charges. See Note 14 for additional information.
	The current assets and current liabilities of discontinued operations were as follows (in thousands):
		31-Mar-15				31-Dec-14
	Accounts receivable and other assets, net	$	—		-1	$	390		-2
	Total current assets of discontinued operations	$	—			$	390
	Accrued liabilities	—			-1	2,873			-3
	Total current liabilities of discontinued operations	$	—			$	2,873
	(1) As of March 31, 2015, the activities related to the discontinued operations described above have been substantially completed. Consequently, all balance sheet items have been written off, disposed of or settled.
	(2) This amount is included in "Other current assets" on the condensed consolidated balance sheet.
	(3) This amount is included in "Accrued liabilities" on the condensed consolidated balance sheet.

Fair_Value_Tables

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis	The following is a list of the Company’s assets required to be measured at fair value on a recurring basis and where they were classified within the hierarchy as of March 31, 2015 (in thousands):
		Fair Value			Quoted		Significant		Significant
					Prices in		Other		Unobservable
					Active Markets		Observable		Inputs
					for Identical		Inputs		(Level 3)
					Assets		(Level 2)
					(Level 1)
	Assets
	Marketable Securities
	Money market funds (1)	$	2,554		$	2,554	$	—	$	—
	Corporate bonds and notes (2)	306,228			—		306,228		—
	Municipal bonds and notes (2)	61,161			—		61,161		—
	Treasury and agency notes and bills (2)	40,891			—		40,891		—
	Commercial paper (3)	9,963			—		9,963		—
	Total Assets	$	420,797		$	2,554	$	418,243	$	—
	The following footnotes indicate where the noted items were recorded in the Condensed Consolidated Balance Sheet at March 31, 2015:
	-1	Reported as cash and cash equivalents.
	-2	Reported as short-term investments.
	-3	Reported as either cash and cash equivalents or short-term investments.
	The following is a list of the Company’s assets required to be measured at fair value on a recurring basis and where they were classified within the hierarchy as of December 31, 2014 (in thousands):
		Fair Value			Quoted		Significant		Significant
					Prices in		Other		Unobservable
					Active Markets		Observable		Inputs
					for Identical		Inputs		(Level 3)
					Assets		(Level 2)
					(Level  1)
	Assets
	Marketable Securities
	Money market funds (1)	$	20,883		$	20,883	$	—	$	—
	Corporate bonds and notes (2)	281,754			—		281,754		—
	Municipal bonds and notes (2)	37,215			—		37,215		—
	Treasury and agency notes and bills (2)	41,268			—		41,268		—
	Commercial paper (3)	33,775			—		33,775		—
	Total Assets	$	414,895		$	20,883	$	394,012	$	—
	The following footnotes indicate where the noted items were recorded in the Condensed Consolidated Balance Sheet at December 31, 2014:
	-1	Reported as cash and cash equivalents.
	-2	Reported as short-term investments.
	-3	Reported as either cash and cash equivalents or short-term investments.
Fair Value Measurements, Nonrecurring	The following table represents the activity in level 3 assets (in thousands):
		Patent Assets
	Balance at December 31, 2014	$	4,280	(1	)
	Asset additions	—
	Assets sold	—
	Assets received	—
	Balance at March 31, 2015	$	4,280
	(1) This amount represents the value of the patents that were received in 2014 as part of settlement agreements reached with parties to resolve prior disputes. These assets were valued using a methodology based on an arms-length purchase price of bulk patent assets, with adjustments based on limited pick rights, the total available market, and remaining average patent life. The value above is gross and the accumulated amortization to date is $0.5 million.

Identified_Intangible_Assets_T

Identified Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Identified Intangible Assets	Identified intangible assets consisted of the following (in thousands):
				31-Mar-15							31-Dec-14
		Average		Gross		Accumulated			Net		Gross		Accumulated			Net
		Life		Assets		Amortization					Assets		Amortization
		(Years)
	Acquired patents / core technology	15-Mar		$	133,757	$	(66,315	)	$	67,442	$	132,157	$	(62,053	)	$	70,104
	Existing technology	10-May		18,920		(18,341		)	579		18,700		(17,932		)	768
	Customer contracts	9-Mar		8,600		(6,808		)	1,792		8,600		(6,569		)	2,031
	Trade name	10-Apr		300		(284		)	16		520		(498		)	22
				$	161,577	$	(91,748	)	$	69,829	$	159,977	$	(87,052	)	$	72,925
Estimated Future Amortization Expense	As of March 31, 2015, the estimated future amortization expense of intangible assets is as follows (in thousands):
	2015 (remaining 9 months)	$	13,945
	2016	17,825
	2017	15,550
	2018	13,768
	2019	5,334
	Thereafter	3,407
		$	69,829

Net_Income_Loss_Per_Share_Tabl

Net Income (Loss) Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Loss Per Share	The following table sets forth the computation of basic and diluted shares (in thousands):
		Three Months Ended
		31-Mar-15		31-Mar-14
	Denominator:
	Weighted average common shares outstanding	52,614		53,320
	Less: Unvested common shares subject to repurchase	(55	)	(97	)
	Total common shares-basic	52,559		53,223
	Effect of dilutive securities:
	Stock awards	433		333
	Restricted stock awards and units	542		237
	Total common shares-diluted	53,534		53,793

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Option Activity	A summary of the stock option activity is presented below (in thousands, except per share amounts):
		Options Outstanding
		Number of		Weighted
		Shares Subject to Options		Average
				Exercise
				Price Per
				Share
	Balance at December 31, 2014	1,616		$19.34
	Options granted	10		$37.11
	Options exercised	(289	)	$19.55
	Options canceled / forfeited / expired	(61	)	$17.39
	Balance at March 31, 2015	1,276		$19.53
Summary of Restricted Stock Awards and Units	Information with respect to outstanding restricted stock awards and units as of March 31, 2015 is as follows (in thousands, except per share amounts):
		Restricted Stock and Restricted Stock Units
		Number of Shares		Number of Shares		Total Number		Weighted Average
		Subject to Time-		Subject to		of Shares		Grant Date Fair
		based Vesting		Performance-				Value Per Share
				based Vesting
	Balance at December 31, 2014	502		633		1,135		$	20.3
	Awards and units granted	353		36		389		$	41.32
	Awards and units vested / earned	(29	)	(144	)	(173	)	$	20.39
	Awards and units canceled / forfeited	(20	)	(60	)	(80	)	$	17.61
	Balance at March 31, 2015	806		465		1,271		$	26.88

StockBased_Compensation_Expens1

Stock-Based Compensation Expense (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Effect of Recording Stock-Based Compensation Expense	The effect of recording stock-based compensation expense for the three months ended March 31, 2015 and 2014 is as follows (in thousands):
		Three Months Ended
		31-Mar-15				31-Mar-14
	Cost of revenues	$	—			$	19
	Research, development and other related costs	690				916
	Selling, general and administrative	1,317				2,569
	Total stock-based compensation expense	2,007				3,504
	Tax effect on stock-based compensation expense	(486		)		(1,104		)
	Net effect on net income (loss)	$	1,521			$	2,400
Stock-Based Compensation Expense Categorized by Equity Components	Stock-based compensation expense categorized by various equity components for the three months ended March 31, 2015 and 2014 is summarized in the table below (in thousands):
		Three Months Ended
		31-Mar-15				31-Mar-14
	Employee stock options	$	885			$	989
	Restricted stock awards and units	973				2,314
	Employee stock purchase plan	149				201
	Total stock-based compensation expense	$	2,007			$	3,504
Schedule of Assumptions Used To Value Options Granted	The following assumptions were used to value the options granted:
		Three Months Ended
		31-Mar-15			31-Mar-14
	Expected life (in years)	3.8			4.9
	Risk-free interest rate	1.4	%		1.7	%
	Dividend yield	2.9	%		3.4	%
	Expected volatility	35.5	%		41.4	%
	ESPP grants occur in February and August. The following assumptions were used to value the ESPP shares for these grants:
			Feb-15			Feb-14
	Expected life (years)		2			2
	Risk-free interest rate		0.4	%		0.3	%
	Dividend yield		3.4	%		3.4	%
	Expected volatility		30	%		31	%

Commitments_And_Contingencies_

Commitments And Contingencies (Tables)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments and Purchase Obligations	As of March 31, 2015, future minimum lease payments are as follows (in thousands):
		Lease
		Obligations
	2015 (remaining 9 months)	$	1,767
	2016	2,209
	2017	2,255
	2018	2,292
	2019	2,129
	Thereafter	1,808
		$	12,460

Segment_And_Geographic_Informa1

Segment And Geographic Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Schedule of Geographic Revenue Information	The table below lists the geographic revenues from continuing operations for the periods indicated (in thousands):
		Three Months Ended,
		31-Mar-15				31-Mar-14
	Taiwan	$	34,781	44	%	$	50,627	57	%
	U.S.	25,530		32		3,885		4
	Korea	15,366		19		26,521		30
	Japan	1,644		2		5,478		6
	Other	2,529		3		1,825		3
		$	79,850	100	%	$	88,336	100	%

Composition_Of_Certain_Financi2

Composition Of Certain Financial Statement Captions - Other Current Assets (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid income taxes	$8,933	$12,841
Interest receivable	2,566	2,138
Other	2,186	2,298
Other current assets, total	$13,685	$17,277

Composition_Of_Certain_Financi3

Composition Of Certain Financial Statement Captions - Accrued Liabilities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Employee compensation and benefits	$4,404	$10,734
Other	3,111	5,423
Accrued liabilities, total	$7,515	$16,157

Composition_Of_Certain_Financi4

Composition Of Certain Financial Statement Captions - Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Unrealized gains and losses on available-for-sale securities, net of tax	$183	($333)
Accumulated other comprehensive income (loss)	$183	($333)

Financial_Instruments_Summary_

Financial Instruments - Summary of Marketable Securities (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Cost	$420,793		$415,408
Available-for-sale securities, Gross Unrealized Gains	250		40
Available-for-sale securities, Gross Unrealized Losses	-246		-553
Estimated Fair Values	420,797	414,895	414,895
Corporate Bonds And Notes
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Cost	306,226	282,279
Available-for-sale securities, Gross Unrealized Gains	203	13
Available-for-sale securities, Gross Unrealized Losses	-201	-538
Estimated Fair Values	306,228	281,754
Municipal Bonds And Notes
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Cost	61,166	37,201
Available-for-sale securities, Gross Unrealized Gains	24	15
Available-for-sale securities, Gross Unrealized Losses	-29	-1
Estimated Fair Values	61,161	37,215
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Cost	9,959	33,774
Available-for-sale securities, Gross Unrealized Gains	4	2
Available-for-sale securities, Gross Unrealized Losses	0	-1
Estimated Fair Values	9,963	33,775
Treasury And Agency Notes And Bills
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Cost	40,888	41,271
Available-for-sale securities, Gross Unrealized Gains	19	10
Available-for-sale securities, Gross Unrealized Losses	-16	-13
Estimated Fair Values	40,891	41,268
Money Market Funds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Cost	2,554	20,883
Available-for-sale securities, Gross Unrealized Gains	0	0
Available-for-sale securities, Gross Unrealized Losses	0	0
Estimated Fair Values	2,554	20,883
Cash and Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Values	2,829	31,382
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Values	$417,968	$383,513

Financial_Instruments_Addition

Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Cash, cash equivalents and short-term investments	$435.30	$434.40
Unrealized loss, net	-0.2
Unrealized gain, net	0.2
Operating Accounts
Schedule of Investments [Line Items]
Cash, cash equivalents and short-term investments	$14.50	$19.50

Financial_Instruments_Fair_Val

Financial Instruments - Fair Value and Gross Unrealized Losses Related to Individual Available-for-Sale Securities (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$194,556	$266,953
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	-227	-550
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or more, Fair Value	42,834	5,453
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or more, Gross Unrealized Losses	-19	-3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	237,390	272,406
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses	-246	-553
Corporate Bonds And Notes
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	146,902	240,165
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	-182	-535
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or more, Fair Value	42,834	5,453
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or more, Gross Unrealized Losses	-19	-3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	189,736	245,618
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses	-201	-538
Treasury And Agency Notes And Bills
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	20,166	16,245
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	-16	-13
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or more, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or more, Gross Unrealized Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	20,166	16,245
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses	-16	-13
Municipal Bonds And Notes
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	26,490	1,061
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	-29	-1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or more, Gross Unrealized Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	26,490	1,061
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses	-29	-1
Commercial Paper
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	998	9,482
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	0	-1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or more, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or more, Gross Unrealized Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	998	9,482
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses	$0	($1)

Financial_Instruments_Estimate

Financial Instruments - Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]
Due in one year or less	$172,100
Due in one to two years	138,436
Due in two to three years	110,261
Estimated Fair Values	$420,797	$414,895	$414,895

Discontinued_Operations_Additi

Discontinued Operations - Additional Information (Details) (Mems Cam Manufacturing Operations)	1 Months Ended	3 Months Ended
	Jan. 31, 2014	Mar. 31, 2015
	employee	employee
Mems Cam Manufacturing Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reduction in employees	300	300

Discontinued_Operations_Result

Discontinued Operations - Results from Discontinued Operations (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Product and service revenues	$0	$0
Total revenues	0	0
Cost of revenues	0	19
Research, development and other related costs	0	5,112
Selling, general and administrative	389	2,237
Restructuring, impairment of long-lived assets and other charges	-371	4,116
Impairment of goodwill	0	0
Total operating expenses	18	11,484
Operating loss before taxes	-18	-11,484
Other income and expense, net	0	180
Provision for (benefit from) income taxes	-46	1,223
Net income (loss) from discontinued operations	$28	($12,527)

Discontinued_Operations_Curren

Discontinued Operations - Current and Non-current Asset and Current Liabilities of Discontinued Operations (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Disposal Group, Including Discontinued Operation, Classified Balance Sheet Disclosures [Abstract]
Accounts receivable and other assets, net	$0	$390
Total current assets of discontinued operations	0	390
Accrued liabilities	0	2,873
Total current liabilities of discontinued operations	$0	$2,873

Fair_Value_Assets_Required_to_

Fair Value - Assets Required to be Measured at Fair Value on Recurring Basis (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$420,797	$414,895
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,554	20,883
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	418,243	394,012
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,554	20,883
Money Market Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,554	20,883
Money Market Funds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Money Market Funds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Corporate Bonds And Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	306,228	281,754
Corporate Bonds And Notes | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Corporate Bonds And Notes | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	306,228	281,754
Corporate Bonds And Notes | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Municipal Bonds And Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	61,161	37,215
Municipal Bonds And Notes | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Municipal Bonds And Notes | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	61,161	37,215
Municipal Bonds And Notes | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Treasury And Agency Notes And Bills
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	40,891	41,268
Treasury And Agency Notes And Bills | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Treasury And Agency Notes And Bills | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	40,891	41,268
Treasury And Agency Notes And Bills | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	9,963	33,775
Commercial Paper | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Commercial Paper | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	9,963	33,775
Commercial Paper | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$0	$0

Fair_Value_Measured_on_a_Nonre

Fair Value - Measured on a Nonrecurring Basis (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accumulated amortization	$91,748	$87,052
Patent Assets | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accumulated amortization	500
Fair Value, Assets Measured on NonRecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2014	4,280
Asset additions	0
Assets sold	0
Assets received	0
Balance at March 31, 2015	$4,280

Identified_Intangible_Assets_A

Identified Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$4,696	$4,603

Identified_Intangible_Assets_I

Identified Intangible Assets - Identified Intangible Assets (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Assets	161,577	$159,977
Accumulated Amortization	-91,748	-87,052
Net	69,829	72,925
Acquired Patents Core Technology
Finite-Lived Intangible Assets [Line Items]
Gross Assets	133,757	132,157
Accumulated Amortization	-66,315	-62,053
Net	67,442	70,104
Acquired Patents Core Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)	3 years
Acquired Patents Core Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)	15 years
Existing Technology
Finite-Lived Intangible Assets [Line Items]
Gross Assets	18,920	18,700
Accumulated Amortization	-18,341	-17,932
Net	579	768
Existing Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)	5 years
Existing Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)	10 years
Customer Contracts
Finite-Lived Intangible Assets [Line Items]
Gross Assets	8,600	8,600
Accumulated Amortization	-6,808	-6,569
Net	1,792	2,031
Customer Contracts | Minimum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)	3 years
Customer Contracts | Maximum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)	9 years
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Assets	300	520
Accumulated Amortization	-284	-498
Net	16	$22
Trade Names | Minimum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)	4 years
Trade Names | Maximum
Finite-Lived Intangible Assets [Line Items]
Average Life (Years)	10 years

Identified_Intangible_Assets_E

Identified Intangible Assets - Estimated Future Amortization Expense of Intangible Assets, Excluding the In-Process Research and Development (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
2015 (remaining 9 months)	$13,945
2016	17,825
2017	15,550
2018	13,768
2019	5,334
Thereafter	3,407
Finite-lived intangible assets, net	$69,829

Net_Income_Loss_Per_Share_Sche

Net Income (Loss) Per Share - Schedule of Basic and Diluted Net Loss Per Share (Detail)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Denominator:
Weighted average common shares outstanding (in shares)	52,614	53,320
Less: Unvested common shares subject to repurchase	-55	-97
Total common shares-basic (in shares)	52,559	53,223
Effect of dilutive securities:
Stock awards (in shares)	433	333
Restricted stock awards and units (in shares)	542	237
Total common shares-diluted (in shares)	53,534	53,793

Net_Income_Loss_Per_Share_Addi

Net Income (Loss) Per Share - Additional Information (Detail)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Shares of common stock excluded from the computation of net loss per share	1.1	2.2

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	77 Months Ended	86 Months Ended	3 Months Ended
	Dec. 31, 2013	Sep. 30, 2014	Mar. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]
Stock repurchase program, authorized amount			250,000,000
Treasury stock, total repurchase during period (in shares)	4,901,000	5,623,000
Treasury stock, average price of share repurchased (in dollars per share)	$21.39	$23.81
Treasury stock, total cost of repurchased stock	104,900,000	133,900,000
Stock repurchase program, remaining amount available for repurchase			116,100,000
Performance Shares | Minimum
Schedule of Trading Securities and Other Trading Assets [Line Items]
Performance awards, percentage of grant available to vest			0.00%
Performance Shares | Maximum
Schedule of Trading Securities and Other Trading Assets [Line Items]
Performance awards, percentage of grant available to vest			100.00%
Employee Stock Purchase Plan
Schedule of Trading Securities and Other Trading Assets [Line Items]
Shares reserved for grant			530,586
2003 Plan | Employee Stock Option
Schedule of Trading Securities and Other Trading Assets [Line Items]
Shares reserved for grant			4,300,000

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Stock Option Activity (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Beginning balance (shares)	1,616
Number of Shares, Options granted (shares)	10
Number of Shares, Options exercised (shares)	-289
Number of Shares, Options cancelled / forfeited / expired (shares)	-61
Number of Shares, Ending balance (shares)	1,276
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price Per Share, Beginning balance (usd per share)	$19.34
Weighted Average Exercise Price Per Share, Options granted (usd per share)	$37.11
Weighted Average Exercise Price Per Share, Options exercised (usd per share)	$19.55
Weighted Average Exercise Price Per Share, Options cancelled / forfeited / expired (usd per share)	$17.39
Weighted Average Exercise Price Per Share, Ending balance (usd per share)	$19.53

Stockholders_Equity_Summary_of1

Stockholders' Equity - Summary of Restricted Stock Awards and Units (Detail) (Restricted Stock, USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock awards and units, beginning balance (shares)	1,135
Restricted stock awards and units, granted (shares)	389
Restricted stock awards and units, vested / earned (shares)	-173
Restricted stock awards and units, cancelled / forfeited (shares)	-80
Restricted stock awards and units, ending balance (shares)	1,271
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant date fair value per share of restricted stock and units, beginning balance (usd per share)	$20.30
Weighted average grant date fair value per share of restricted stock and units, granted (usd per share)	$41.32
Weighted average grant date fair value per share of restricted stock and units, vested / earned (usd per share)	$20.39
Weighted average grant date fair value of restricted stock and units, cancelled / forfeited (usd per share)	$17.61
Weighted average grant date fair value per share of restricted stock and units, ending balance (usd per share)	$26.88
Number Of Shares Subject To Time-Based Vesting
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock awards and units, beginning balance (shares)	502
Restricted stock awards and units, granted (shares)	353
Restricted stock awards and units, vested / earned (shares)	-29
Restricted stock awards and units, cancelled / forfeited (shares)	-20
Restricted stock awards and units, ending balance (shares)	806
Number Of Shares Subject To Performance-Based Vesting
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock awards and units, beginning balance (shares)	633
Restricted stock awards and units, granted (shares)	36
Restricted stock awards and units, vested / earned (shares)	-144
Restricted stock awards and units, cancelled / forfeited (shares)	-60
Restricted stock awards and units, ending balance (shares)	465

StockBased_Compensation_Expens2

Stock-Based Compensation Expense - Effect of Recording Stock-Based Compensation Expense (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$2,007	$3,504
Cost of Revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	0	19
Research, Development and Other Related Costs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	690	916
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$1,317	$2,569

StockBased_Compensation_Expens3

Stock-Based Compensation Expense - Categorized by Equity Components (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$2,007	$3,504
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	885	989
Restricted Stock Awards And Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	973	2,314
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$149	$201

StockBased_Compensation_Expens4

Stock-Based Compensation Expense - Schedule of Assumptions Used to Value Options Granted (Detail)	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Feb. 28, 2014	Feb. 28, 2013
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected life (in years)	3 years 9 months 24 days	4 years 10 months 24 days
Risk-free interest rate	1.40%	1.70%
Dividend yield	2.90%	3.40%
Expected volatility	35.50%	41.40%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected life (in years)			2 years	2 years
Risk-free interest rate			0.40%	0.30%
Dividend yield			3.40%	3.40%
Expected volatility			30.00%	31.00%

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Tax Contingency [Line Items]
Provision for income taxes	$17,224,000	$22,686,000
Unrecognized tax benefits	2,600,000		2,700,000
Unrecognized tax benefits that would impact the effective income tax rate	1,400,000		1,100,000
Interest and tax penalties related to unrecognized tax benefits	500,000	500,000
Minimum
Income Tax Contingency [Line Items]
Expected reduction resulting from lapse of applicable statute of limitations	1,300,000
Maximum
Income Tax Contingency [Line Items]
Expected reduction resulting from lapse of applicable statute of limitations	$1,500,000

Commitments_And_Contingencies_1

Commitments And Contingencies - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Rent under operating lease agreement	$0.50	$1

Commitments_And_Contingencies_2

Commitments And Contingencies - Schedule of Future Minimum Lease Payments and Purchase Obligations (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
2015 (remaining 9 months)	$1,767
2016	2,209
2017	2,255
2018	2,292
2019	2,129
Thereafter	1,808
Lease Obligations, Total	$12,460

Segment_And_Geographic_Informa2

Segment And Geographic Information - Schedule of Geographic Revenue Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	customer	customer
Segment Reporting [Abstract]
Number of major customers each accounting for 10% or more of total revenues	4	2
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	$79,850	$88,336
Percentage of revenue	100.00%	100.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	34,781	50,627
Percentage of revenue	44.00%	57.00%
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	25,530	3,885
Percentage of revenue	32.00%	4.00%
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	15,366	26,521
Percentage of revenue	19.00%	30.00%
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	1,644	5,478
Percentage of revenue	2.00%	6.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Foreign revenues	$2,529	$1,825
Percentage of revenue	3.00%	3.00%

Restructuring_Impairment_of_Lo1

Restructuring, Impairment of Long-Lived Assets And Other Charges - Additional Information (Detail) (Mems Cam Manufacturing Operations, USD $)	1 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Jan. 31, 2014	Mar. 31, 2015	Dec. 31, 2013	Dec. 31, 2014
	employee	employee
Restructuring Cost and Reserve [Line Items]
Reduction in employees	300	300
Impairment charges			$32.80
Intangible asset impairment charge			4.8
Asset impairment charges			2.1
Severance costs		1
Inventories and Equipment
Restructuring Cost and Reserve [Line Items]
Purchase obligation				$9.80

Subsequent_Event_Additional_In

Subsequent Event - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Apr. 29, 2015
Subsequent Event [Line Items]
Cash dividends declared per share (in dollars per share)	$0.20	$0.10
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared per share (in dollars per share)			$0.20