RPX (RPXC) 10-Q 7 May 14 2014 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 30, 2014
Document and Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Entity Trading Symbol	'RPXC	'
Entity Registrant Name	'RPX Corporation	'
Entity Central Index Key	'0001509432	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	53,012,699

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$120,898	$100,155
Short-term investments	181,816	190,567
Restricted cash	364	364
Accounts receivable	13,071	38,477
Prepaid expenses and other current assets	9,030	10,546
Deferred tax assets	4,343	3,817
Total current assets	329,522	343,926
Patent assets, net	247,962	219,954
Property and equipment, net	4,506	4,667
Intangible assets, net	1,402	1,718
Goodwill	16,460	16,460
Restricted cash, less current portion	1,454	1,454
Other assets	618	622
Total assets	601,924	588,801
Current liabilities:	'	'
Accounts payable	633	332
Accrued liabilities	6,317	8,784
Deferred revenue	138,684	131,808
Deferred payment obligations	0	500
Other current liabilities	1,060	1,638
Total current liabilities	146,694	143,062
Deferred revenue, less current portion	1,850	5,935
Deferred tax liabilities	11,315	11,654
Other liabilities	3,106	3,227
Total liabilities	162,965	163,878
Common stock	5	5
Additional paid-in capital	309,537	305,343
Retained earnings	129,387	119,527
Accumulated other comprehensive income	30	48
Total stockholders' equity	438,959	424,923
Total liabilities and stockholders' equity	$601,924	$588,801

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue	$61,888	$61,194
Cost of revenue	28,920	23,670
Selling, general and administrative expenses	17,255	14,473
Operating income	15,713	23,051
Other income, net	99	51
Income before provision for income taxes	15,812	23,102
Provision for income taxes	5,952	8,407
Net income	9,860	14,695
Net income available to common stockholders	$9,860	$14,678
Net income available to common stockholders per common share:	'	'
Basic	$0.19	$0.29
Diluted	$0.18	$0.28
Weighted-average shares used in computing net income available to common stockholders per common share:	'	'
Basic	52,803	51,201
Diluted	54,443	52,653

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net income	$9,860	$14,695
Other comprehensive income, net of tax:	'	'
Unrealized holding gains (losses) arising during the period	-18	99
Less: reclassification adjustment for (gains) losses included in net income	0	1
Net unrealized gains (losses) on available-for-sale securities, net of tax	-18	100
Comprehensive income	$9,842	$14,795

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities	'	'
Net income	$9,860	$14,695
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	28,418	23,325
Stock-based compensation	3,802	3,708
Excess tax benefit from stock-based compensation	-694	-968
Amortization of premium on investments	1,608	1,270
Deferred taxes	-893	-1,153
Other	-500	6
Changes in assets and liabilities:	'	'
Accounts receivable	25,406	11,978
Other receivables	0	33,775
Prepaid expenses and other assets	463	1,801
Accounts payable	467	-68
Accrued and other liabilities	-2,601	-1,978
Deferred revenue	2,791	13,806
Net cash provided by operating activities	68,127	100,197
Cash flows from investing activities	'	'
Purchases of investments classified as available-for-sale	-51,125	-58,030
Maturities of investments classified as available-for-sale	59,945	37,811
Purchases of property and equipment	-426	-421
Acquisitions of patent assets	-56,153	-19,437
Net cash used in investing activities	-47,759	-40,077
Cash flows from financing activities	'	'
Proceeds from exercise of stock options and other common stock issuances	582	1,019
Taxes paid related to net share settlements of restricted stock units	-901	0
Excess tax benefit from stock-based compensation	694	968
Net cash provided by financing activities	375	1,987
Net increase in cash and cash equivalents	20,743	62,107
Cash and cash equivalents at beginning of period	100,155	73,638
Cash and cash equivalents at end of period	120,898	135,745
Non-cash investing and financing activities	'	'
Change in patent assets purchased and accrued but not paid	-500	10,000
Change in fixed assets purchased and accrued but not yet paid	-166	0
Change in other assets purchased and accrued but not paid	($63)	$250

Nature_of_Business

Nature of Business	3 Months Ended
	Mar. 31, 2014
Nature of Business	'
Nature Of Business [Text Block]	'
	Nature of Business
	RPX Corporation (also referred to herein as “RPX” or the “Company”) helps companies reduce patent-related risk and expense by providing a subscription-based patent risk management solution that facilitates more efficient exchanges of value between owners and users of patents compared to transactions driven by actual or threatened litigation. The core of the Company’s solution is defensive patent aggregation, in which it acquires patents or licenses to patents that are being or may be asserted against the Company’s current or prospective clients. The Company may occasionally enter into agreements to acquire covenants not to sue in order to further mitigate its clients’ litigation risk. The acquired patents, licenses to patents, patent rights and agreements for covenants not to sue are collectively referred to as “patent assets.” The Company’s clients pay an annual subscription fee and in return, receive a license from the Company to substantially all of its patent assets and access to its proprietary patent market intelligence and data. In addition to the Company’s core solution, in August 2012, the Company began underwriting patent infringement liability insurance policies to insure against certain costs of litigation from non-practicing entities (“NPEs”). As of and for the three months ended March 31, 2014, the effect of the insurance policies that have been issued was not material to the Company’s results of operations or financial condition.

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	3 Months Ended
	Mar. 31, 2014
Basis of Presentation and Significant Accounting Policies (Abstract)	'
Basis Of Presentation And Significant Accounting Policies [Text Block]	'
	Basis of Presentation and Significant Accounting Policies
	Basis of Presentation
	The accompanying condensed consolidated balance sheet as of March 31, 2014, the condensed consolidated statements of operations, the condensed consolidated statements of comprehensive income, and the condensed consolidated statements of cash flows for the three months ended March 31, 2014 and 2013, are unaudited. The condensed consolidated balance sheet as of December 31, 2013 was derived from the audited consolidated financial statements which are included in the Company’s Form 10-K for the fiscal year ended December 31, 2013, which was filed with the Securities and Exchange Commission (“SEC”) on March 10, 2014. The unaudited condensed consolidated financial statements should be read in conjunction with the audited financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.
	The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America and with the instructions for Form 10-Q and Regulation S-X for interim financial statements. Accordingly, they do not include all of the information and notes required for complete financial statements. In the opinion of management, all adjustments, consisting of normal recurring items, necessary to state fairly the results of the interim periods have been included in the accompanying financial statements. Operating results for the three months ended March 31, 2014 are not necessarily indicative of the results that may be expected for any subsequent interim period or for the year ending December 31, 2014.
	There have been no material changes to the Company’s significant accounting policies during the three months ended March 31, 2014, as compared to the significant accounting policies presented under the heading “Basis of Presentation and Significant Accounting Policies” in Note 2 of the Notes to Consolidated Financial Statements in Part II, Item 8 of the Company’s Annual Report on Form 10-K filed with the SEC on March 10, 2014.

Net_Income_Available_to_Common

Net Income Available to Common Stockholders	3 Months Ended
	Mar. 31, 2014
Net Income Available to Common Stockholders	'
Net Income Available to Common Stockholders [Text Block]	'
	Net Income Available to Common Stockholders
	Basic and diluted net income per share available to common stockholders are presented in conformity with the two-class method required for participating securities. The holders of restricted common stock are entitled to receive non-forfeitable dividends if declared.
	Under the two-class method, basic net income per share available to common stockholders is computed by dividing the net income available to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Net income available to common stockholders is determined by allocating undistributed earnings between common and restricted common stockholders. Diluted net income per share available to common stockholders is computed by using the weighted-average number of shares of common stock outstanding, including potential dilutive shares of common stock, assuming the dilutive effect of outstanding stock options and restricted stock units using the treasury stock method.
	The following table presents the calculation of basic and diluted net income per share available to common stockholders (in thousands, except for per share data):
		Three Months Ended March 31,
		2014			2013
	Net income available to common stockholders:
	Numerator:
	Net income	$	9,860		$	14,695
	Allocation of net income to participating stockholders	—			(17		)
	Net income available to common stockholders	$	9,860		$	14,678
	Denominator:
	Basic shares:
	Weighted-average shares used in computing basic net income available to common stockholders	52,803			51,201
	Diluted shares:
	Weighted-average shares used in computing basic net income available to common stockholders	52,803			51,201
	Dilutive effect of stock options and restricted stock units using the treasury-stock method	1,640			1,452
	Weighted-average shares used in computing diluted net income available to common stockholders	54,443			52,653
	Net income per common share available to common stockholders:
	Basic	$	0.19		$	0.29
	Diluted	$	0.18		$	0.28
	The following securities were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive (in thousands):
		Three Months Ended March 31,
		2014		2013
	Weighted-average:
	Stock options outstanding	798		2,622
	Restricted stock units outstanding	60		347
	Shares of common stock subject to repurchase	—		59

Fair_Value_Measurements_Fair_V

Fair Value Measurements Fair Value Measurements	3 Months Ended
	Mar. 31, 2014
Fair Value Measurements [Abstract]	'
Fair Value Measurements [Text Block]	'
	Fair Value Measurements
	The following tables present the Company’s financial assets measured at fair value on a recurring basis (in thousands):
		March 31, 2014
		Fair Value		Level 1		Level 2
	Cash equivalents:
	Commercial paper	$	41,998	$	—	$	41,998
	Municipal bonds	3,378		—		3,378
	Money market funds	1,785		1,785		—
		$	47,161	$	1,785	$	45,376
	Short-term investments:
	Municipal bonds	$	151,400	$	—	$	151,400
	Corporate bonds	14,913		—		14,913
	U.S. government and agency securities	10,005		—		10,005
	Commercial paper	5,498		—		5,498
		$	181,816	$	—	$	181,816
		December 31, 2013
		Fair Value		Level 1		Level 2
	Cash equivalents:
	Commercial paper	$	34,498	$	—	$	34,498
	U.S. government and agency securities	3,801		—		3,801
	Money market funds	37		37		—
		$	38,336	$	37	$	38,299
	Short-term investments:
	Municipal bonds	$	146,100	$	—	$	146,100
	Commercial paper	31,597		—		31,597
	Corporate bonds	7,875		—		7,875
	U.S. government and agency securities	4,995		—		4,995
		$	190,567	$	—	$	190,567
	As of March 31, 2014 and December 31, 2013, the Company did not use level 3 inputs to measure financial assets or liabilities at fair value.

Shortterm_Investments

Short-term Investments	3 Months Ended
	Mar. 31, 2014
Short-term Investment [Abstract]	'
Short-term Investments [Text Block]	'
	Short-term Investments
	The following tables present the Company’s investments in available-for-sale securities (in thousands):
		March 31, 2014
				Unrealized
		Amortized Cost		Gains		Losses			Estimated Fair Value
	Municipal bonds	$	151,360	$	44	$	(4	)	$	151,400
	Corporate bonds	14,919		1		(7		)	14,913
	U.S. government and agency securities	10,010		—		(5		)	10,005
	Commercial paper	5,498		—		—			5,498
		$	181,787	$	45	$	(16	)	$	181,816
		December 31, 2013
				Unrealized
		Amortized Cost		Gains		Losses			Estimated Fair Value
	Municipal bonds	$	146,047	$	56	$	(3	)	$	146,100
	Commercial paper	31,597		—		—			31,597
	Corporate bonds	7,873		2		—			7,875
	U.S. government and agency securities	5,002		—		(7		)	4,995
		$	190,519	$	58	$	(10	)	$	190,567
	Available-for-sale securities are reported at fair value, with unrealized gains and losses, net of tax, included as a separate component of stockholders’ equity within accumulated other comprehensive income. Realized gains and losses on available-for-sale securities are included in other income, net in the Company’s condensed consolidated statements of operations.
	The weighted-average remaining maturity of the Company’s investment portfolio was less than one year as of March 31, 2014 and December 31, 2013. As of March 31, 2014, no individual securities incurred continuous unrealized losses for greater than 12 months.

Patent_Assets_Net

Patent Assets, Net	3 Months Ended
	Mar. 31, 2014
Patent Assets [Abstract]	'
Patent Assets, Net [Text Block]	'
	Patent Assets, Net
	Patent assets, net consisted of the following (in thousands):
		Balance as of December 31, 2013			Additions			Assets held-for-sale			Balance as of March 31, 2014
	Patent assets	$	529,526		$	55,653		$	(11	)	$	585,168
	Accumulated amortization	(309,572		)	(27,638		)	4			(337,206		)
	Patent assets, net	$	219,954								$	247,962
	The Company’s acquired patent assets relate to technologies used or supplied by companies in a variety of market sectors, including consumer electronics, e-commerce, financial services, media distribution, mobile communications, networking, semiconductors and software. The Company amortizes each acquired portfolio of patent assets on a straight-line basis over its estimated economic useful life. As of March 31, 2014, the estimated economic useful lives of the Company’s patent assets generally ranged from 24 to 60 months. As of March 31, 2014, the weighted-average estimated economic useful life at the time of acquisition of all patents acquired since the Company’s inception was 46 months.
	As of March 31, 2014, the Company expects amortization expense in future periods to be as follows (in thousands):
	2014 (remainder)	$	82,312
	2015	84,497
	2016	56,524
	2017	19,879
	2018	4,688
	Thereafter	62
	Total estimated future amortization expense	$	247,962
	Amortization expense was $27.6 million and $22.6 million for the three months ended March 31, 2014 and 2013, respectively.

Property_and_Equipment_Net

Property and Equipment, Net	3 Months Ended
	Mar. 31, 2014
Property and Equipment, Net	'
Property and Equipment, Net [Text Block]	'
	Property and Equipment, Net
	Property and equipment, net, consisted of the following (in thousands):
		March 31,			December 31,
		2014			2013
	Internal-use software	$	4,340		$	4,198
	Leasehold improvements	1,741			1,700
	Computer, equipment and software	1,181			1,096
	Furniture and fixtures	813			813
	Construction-in-progress	154			119
	Total property and equipment, gross	8,229			7,926
	Less: Accumulated depreciation and amortization	(3,723		)	(3,259		)
	Total property and equipment, net	$	4,506		$	4,667
	Depreciation and amortization expense was $0.5 million and $0.4 million for the three months ended March 31, 2014 and 2013, respectively. Stock-based compensation capitalized as part of the cost of internal-use software was nil and $0.1 million for the three months ended March 31, 2014 and 2013, respectively.

Intangible_Assets_Net

Intangible Assets, Net	3 Months Ended
	Mar. 31, 2014
Intangible Assets, Net	'
Intangible Assets, Net [Text Block]	'
	Intangible Assets, Net
	Intangible assets, net, consisted of the following (in thousands):
		31-Mar-14							31-Dec-13
		Carrying Amount		Accumulated Amortization			Net Carrying Amount		Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Proprietary data and models	$	1,500	$	(731	)	$	769	$	1,500	$	(637	)	$	863
	Trademarks	1,890		(1,321		)	569		1,890		(1,184		)	706
	Developed technology	728		(678		)	50		728		(625		)	103
	Customer relationships	250		(236		)	14		250		(215		)	35
	Covenant not to compete	—		—			—		480		(469		)	11
		$	4,368	$	(2,966	)	$	1,402	$	4,848	$	(3,130	)	$	1,718
	As of March 31, 2014, the Company expects amortization expense in future periods to be as follows (in thousands):
	2014 (remainder)	$	590
	2015	625
	2016	187
	Total estimated future amortization expense	$	1,402
	Amortization expense was $0.3 million and $0.4 million for the three months ended March 31, 2014 and 2013, respectively.

Accrued_and_Other_Current_Liab

Accrued and Other Current Liabilities	3 Months Ended
	Mar. 31, 2014
Accrued and Other Current Liabilities	'
Accrued And Other Current Liabilities [Text Block]	'
	Accrued and Other Current Liabilities
	Accrued and other current liabilities consisted of the following (in thousands):
		March 31,		December 31,
		2014		2013
	Accrued payroll-related expenses	$	3,810	$	6,791
	Accrued expenses	2,507		1,993
	Total accrued liabilities	$	6,317	$	8,784
	Patent and other assets purchased but not paid	$	—	$	563
	Other current liabilities	1,060		1,075
	Total other current liabilities	$	1,060	$	1,638

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure	'
Commitments And Contingencies [Text Block]	'
	Commitments and Contingencies
	Operating Lease Commitments
	The Company generally does not enter into long-term minimum purchase commitments. Its principal long-term commitments consist of obligations under operating leases for office space. There were no substantial changes to the Company’s contractual obligations or commitments during the three months ended March 31, 2014 as compared to those presented under the heading “Commitments and Contingencies” in Note 12 of the Notes to Consolidated Financial Statements in Part II, Item 8 of the Company’s Annual Report on Form 10-K filed with the SEC on March 10, 2014.
	Rent expense related to non-cancelable operating leases was $0.9 million and $0.6 million for the three months ended March 31, 2014 and 2013, respectively, net of sublease income of $0.1 million and nil, respectively.
	Litigation
	From time to time, the Company may be a party to various litigation claims in the normal course of business. Legal fees and other costs associated with such actions are expensed as incurred. The Company assesses, in conjunction with its legal counsel, the need to record a liability for litigation or contingencies. A liability is recorded when and if it is determined that such a liability for litigation or contingencies is both probable and reasonably estimable. No liability for litigation or contingencies was recorded as of March 31, 2014 or December 31, 2013.
	In June 2013, Kevin O’Halloran, as Trustee of the Liquidating Trust of Teltronics, Inc. (the “Debtor”), filed a complaint in the U.S. Bankruptcy Court for the Middle District of Florida against the Company and Harris Corporation (the “Defendants”). The complaint alleges that the Defendants are liable under federal and state bankruptcy law regarding fraudulent transfers for the value of a patent portfolio purchased by the Company from Harris Corporation pursuant to an agreement entered into in January 2009, and within four years of the date the Debtor filed its petition in bankruptcy. The Company is not currently able to determine whether there is a reasonable possibility that a loss has been incurred, nor can it estimate the potential loss or range of the potential loss that may result from this litigation.
	In February 2013, Volkswagen Group of America, Inc. (“Volkswagen”) filed a third-party complaint against the Company as part of an existing patent infringement lawsuit in the U.S. District Court for the Eastern District of Texas that was originally filed by Norman IP Holdings, LLC (“Norman”) and in which Volkswagen is a defendant. The complaint relates to a patent license and acquisition transaction that the Company entered into with Norman and Saxon Innovations, LLC (“Saxon”) in January 2010. The claims allege that the Company, together with Norman and Saxon, violated federal antitrust law and Texas antitrust law. Volkswagen seeks declaratory relief, unspecified monetary damages, and injunctive relief. In March 2014, Volkswagen voluntarily dismissed its complaint against the Company without prejudice.
	In March 2012, Cascades Computer Innovations LLC filed a complaint in U.S. District Court for the Northern District of California (the “Court”) against the Company and five of its clients (collectively the “Defendants”). The complaint alleges that the Defendants violated federal antitrust law, California antitrust law and California unfair competition law. The complaint further alleges that after the Company terminated its negotiations with the plaintiff to license certain patents held by the plaintiff, the Defendants violated the law by jointly refusing to negotiate or accept licenses under the plaintiff’s patents. The plaintiff seeks unspecified monetary damages and injunctive relief. In January 2013, the Court dismissed the complaint against the Defendants and granted the plaintiff leave to amend its complaint. In February 2013, the plaintiff filed an amended lawsuit alleging that the Defendants violated federal antitrust law, California antitrust law and California unfair competition law. The Company is not currently able to determine whether there is a reasonable possibility that a loss has been incurred, nor can it estimate the potential loss or range of the potential loss that may result from this litigation.
	Guarantees and Indemnifications
	The Company has, in connection with the sale of patent assets, agreed to indemnify and hold harmless the buyer of such patent assets for losses resulting from breaches of representations and warranties made by the Company. The terms of these indemnification agreements are generally perpetual. The maximum amount of potential future indemnification is unlimited. To date, the Company has not paid any amount to settle claims or defend lawsuits. The Company is unable to reasonably estimate the maximum amount that could be payable under these arrangements since these obligations are not capped but are conditional to the unique facts and circumstances involved. The Company had no liabilities recorded for these agreements as of March 31, 2014 or December 31, 2013. The Company has no reason to believe that there is any material liability related to such indemnification provisions. The Company does not indemnify its clients for patent infringement.
	In accordance with its amended and restated bylaws, the Company also indemnifies certain officers and employees for losses incurred in connection with actions, suits or proceedings threatened or brought against such officer or employee arising from his or her service to the Company as an officer or employee, subject to certain limitations. The term of the indemnification period is indefinite. The maximum amount of potential future indemnification is unspecified. The Company has no reason to believe that there is any material liability for actions, events or occurrences that have occurred to date.
	Reserves for Known and Incurred but not Reported Claims
	In August 2012, the Company began offering insurance to cover certain costs of litigation brought against its insured clients by NPEs. As of March 31, 2014, the Company had a total of 31 active policies and had recorded a reserve of $0.6 million, net of amounts recoverable from reinsurers, for known and incurred but not reported claims that represent estimated claim costs and related expenses.
	The Company regularly reviews its loss reserves using a variety of actuarial techniques and updates them as its loss experience develops.

Stockholders_Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2014
Stock-Based Compensation	'
Stockholders' Equity [Text Block]	'
	Stockholders’ Equity
	Equity Plans
	A summary of the Company’s activity under its equity-settled award plans and related information is as follows (in thousands, except per share data):
					Options Outstanding
		Shares Available for Grant			Number of Shares			Weighted-Average Exercise Price			Weighted-Average Remaining Contractual Life in Years	Aggregate Intrinsic Value
	Balance - December 31, 2013	2,451			4,089			$	9.91
	Shares authorized(1)	1,000			—			—
	Options exercised	—			(138	)		4.18
	Options forfeited/canceled	20			(20	)		16.26
	Restricted stock units granted	(1,098	)		—			—
	Restricted stock units forfeited	56			—			—
	Restricted stock units withheld related to net-share settlement of restricted stock units	56			—			—
	Balance - March 31, 2014	2,485			3,931			10.08			6.8	$	26,904
	Vested and exercisable - March 31, 2014				2,318			10.27			6.7	16,165
	Vested and expected to vest - March 31, 2014				3,717			10.1			6.8	25,484
	(1) In March 2014, the Company reserved an additional 1,000,000 shares of its common stock for future issuance under the 2011 Plan.
	The aggregate intrinsic value of stock options exercised during the three months ended March 31, 2014 and 2013 was $1.7 million and $4.0 million, respectively. The total fair value of stock options vested during the three months ended March 31, 2014 and 2013 was $1.7 million and $2.2 million, respectively.
	Restricted Stock Units
	The summary of restricted stock unit activity, which includes performance-based restricted stock units with a market condition (“PBRSUs”), is as follows (in thousands, except for per share data):
		Number of Shares			Weighted-Average Grant Date Fair Value				Aggregate Intrinsic Value
	Non-vested units - December 31, 2013	2,057			$	12.38
	Granted	1,098			13.97
	Vested	(148	)		10.99
	Forfeited	(56	)		13.77
	Non-vested units - March 31, 2014	2,951			13.02				$	48,049
	The total fair value of restricted stock units (“RSUs”) vested during the three months ended March 31, 2014 and 2013 was $2.4 million and $0.4 million, respectively.
	In October 2013, the Board of Directors approved net-share settlement for tax withholdings on RSU vesting. During the three months ended March 31, 2014, the Company withheld issuing 55,648 shares of its common stock based on the value of the RSUs on their vesting dates as determined by the Company’s closing common stock price. Total payments for the employees’ minimum tax obligations to taxing authorities were $0.9 million for the three months ended March 31, 2014, and were recorded as a reduction to additional paid-in capital and reflected as a financing activity within the condensed consolidated statements of cash flows. The net-share settlements reduced the number of shares that would have otherwise been issued on the vesting date and increased the number of shares reserved for future issuance under the 2011 Plan.
	Stock-Based Compensation Related to Employees and Directors
	The fair value of RSUs granted to employees and directors is measured by reference to the fair value of the underlying shares on the date of grant.
	PBRSUs contain both service and market conditions that affect the quantity of awards that will vest. During the three months ended March 31, 2014 and 2013, the Company granted 200,000 and 125,000 PBRSUs, respectively. The Company estimates the grant date fair value of PBRSUs using the Monte Carlo simulation model. The weighted-average assumptions used to estimate the fair value of PBRSUs and the resulting fair values are as follows:
		Three Months Ended March 31,
		2014				2013
	Dividend yield	—		%		—		%
	Risk-free rate	1.11		%		0.62		%
	Expected volatility	48		%		55		%
	Grant date fair value	$	7.47			$	6
	Stock-based compensation expense related to stock options granted to employees and directors was $1.5 million and $2.4 million for the three months ended March 31, 2014 and 2013, respectively. Stock-based compensation expense related to RSUs granted to employees and directors was $2.2 million and $1.1 million for the three months ended March 31, 2014 and 2013, respectively. Stock-based compensation expense related to PBRSUs granted to employees was $0.2 million and less than $0.1 million for the three months ended March 31, 2014 and 2013, respectively.
	As of March 31, 2014, there was $8.9 million and $35.0 million of unrecognized compensation cost related to stock options and RSUs, including PBRSUs, respectively, which is expected to be recognized over a weighted-average period of 2.0 years and 3.1 years, respectively. Future grants of equity awards will increase the amount of stock-based compensation expense to be recorded.
	Stock-Based Compensation Related to Non-Employees
	The Company periodically grants equity awards to non-employees in exchange for goods and services. No equity awards were granted to non-employees in exchange for goods and services during the three months ended March 31, 2014 and 2013.
	Stock-based compensation expense for non-employees is based on the fair value of the award on the measurement date, which is the earlier of the date by which the commitment for performance by the non-employee to earn the award is reached and the date on which the non-employee’s performance is complete. Each reporting period, the fair value of the unvested non-employee stock option or RSU is revalued until the award vests on the measurement date.
	Non-employee stock-based compensation expense related to stock options was nil and $0.1 million for the three months ended March 31, 2014 and 2013, respectively. Non-employee stock-based compensation expense related to RSUs was nil and $0.1 million for the three months ended March 31, 2014 and 2013, respectively.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2014
Income Taxes [Abstract]	'
Income Taxes [Text Block]	'
	Income Taxes
	The Company uses an estimated annual effective tax rate based upon a projection of its annual fiscal year results to measure the income tax benefit or expense recognized in each interim period. The Company’s effective tax rate, including the impact of discrete benefit items, was 38% and 36% for the three months ended March 31, 2014 and 2013, respectively. The higher effective tax rate for the three months ended March 31, 2014 was primarily due to an increase in nondeductible executive compensation which was partially offset by a decrease in book expense for nondeductible incentive stock options.
	The Company’s 2010 tax year is currently under examination by the State of California Franchise Tax Board. The Company does not expect a material impact on its condensed consolidated financial statements as a result of this examination. The 2010 through 2012 tax periods remain open to examination by the Internal Revenue Service and the 2009 through 2012 tax periods remain open to examination by most state tax authorities. For the Company’s foreign jurisdictions, the 2009 through 2012 tax years remain open to examination by their respective tax authorities.

RelatedParty_Transactions

Related-Party Transactions	3 Months Ended
	Mar. 31, 2014
Related-Party Transactions	'
Related Party Transactions [Text Block]	'
	Related-Party Transactions
	During the three months ended March 31, 2014, four members of the Company’s Board of Directors also served on the boards of directors of RPX clients. During the three months ended March 31, 2013, three members of the Company’s Board of Directors also served on the boards of directors of RPX clients. The Company recognized subscription revenue from these clients in the amount of $1.4 million and $1.2 million during the three months ended March 31, 2014 and 2013, respectively. As of December 31, 2013, there was $4.4 million of receivables due from these clients. There were no receivables due from these clients on March 31, 2014.

Segment_Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2014
Segment Reporting	'
Segment Reporting [Text Block]	'
	Segment Reporting
	Operating segments are components of an enterprise about which separate financial information is available. Operating segments are reported in a manner consistent with the internal reporting provided to the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer. The Company’s Chief Executive Officer reviews financial information presented on a consolidated basis and, as a result, the Company concluded that there is only one operating and reportable segment.
	The Company markets its solution to companies around the world. Revenue is generally attributed to geographic areas based on the country in which the client is domiciled.
	The following table presents revenue by location and revenue generated by country as a percentage of total revenue for the applicable period, for countries representing 10% or more of revenues for the periods presented (dollars in thousands):
		Three Months Ended March 31,
		2014				2013
	United States	$	37,105	60	%	$	37,567	61	%
	Japan	9,556		15		10,661		17
	Taiwan	4,885		8		6,017		10
	Other	10,342		17		6,949		12
	Total revenue	$	61,888	100	%	$	61,194	100	%
	Long-lived assets information by location is presented below (in thousands):
		March 31,		December 31,
		2014		2013
	United States	$	4,487	$	4,646
	Japan	19		21
	Total long-lived assets	$	4,506	$	4,667

Basis_of_Presentation_and_Sign1

Basis of Presentation and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2014
Basis of Presentation and Significant Accounting Policies (Abstract)	'
Basis of Presentation [Policy Text Block]	'
	Basis of Presentation
	The accompanying condensed consolidated balance sheet as of March 31, 2014, the condensed consolidated statements of operations, the condensed consolidated statements of comprehensive income, and the condensed consolidated statements of cash flows for the three months ended March 31, 2014 and 2013, are unaudited. The condensed consolidated balance sheet as of December 31, 2013 was derived from the audited consolidated financial statements which are included in the Company’s Form 10-K for the fiscal year ended December 31, 2013, which was filed with the Securities and Exchange Commission (“SEC”) on March 10, 2014. The unaudited condensed consolidated financial statements should be read in conjunction with the audited financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.
	The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America and with the instructions for Form 10-Q and Regulation S-X for interim financial statements. Accordingly, they do not include all of the information and notes required for complete financial statements. In the opinion of management, all adjustments, consisting of normal recurring items, necessary to state fairly the results of the interim periods have been included in the accompanying financial statements. Operating results for the three months ended March 31, 2014 are not necessarily indicative of the results that may be expected for any subsequent interim period or for the year ending December 31, 2014.
	There have been no material changes to the Company’s significant accounting policies during the three months ended March 31, 2014, as compared to the significant accounting policies presented under the heading “Basis of Presentation and Significant Accounting Policies” in Note 2 of the Notes to Consolidated Financial Statements in Part II, Item 8 of the Company’s Annual Report on Form 10-K filed with the SEC on March 10, 2014.

Net_Income_Available_to_Common1

Net Income Available to Common Stockholders (Tables)	3 Months Ended
	Mar. 31, 2014
Net Income Available to Common Stockholders	'
Basic and Diluted Net Income Per Share Available To Common Stockholders [Table Text Block]	'
	The following table presents the calculation of basic and diluted net income per share available to common stockholders (in thousands, except for per share data):
		Three Months Ended March 31,
		2014			2013
	Net income available to common stockholders:
	Numerator:
	Net income	$	9,860		$	14,695
	Allocation of net income to participating stockholders	—			(17		)
	Net income available to common stockholders	$	9,860		$	14,678
	Denominator:
	Basic shares:
	Weighted-average shares used in computing basic net income available to common stockholders	52,803			51,201
	Diluted shares:
	Weighted-average shares used in computing basic net income available to common stockholders	52,803			51,201
	Dilutive effect of stock options and restricted stock units using the treasury-stock method	1,640			1,452
	Weighted-average shares used in computing diluted net income available to common stockholders	54,443			52,653
	Net income per common share available to common stockholders:
	Basic	$	0.19		$	0.29
	Diluted	$	0.18		$	0.28
Anti-Dilutive Securities Not Included In Diluted Shares Outstanding Calculation [Table Text Block]	'
	he following securities were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive (in thousands):
		Three Months Ended March 31,
		2014		2013
	Weighted-average:
	Stock options outstanding	798		2,622
	Restricted stock units outstanding	60		347
	Shares of common stock subject to repurchase	—		59

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Measurements	'
Finance Assets Measured At Fair Value On A Recurring Basis [Table Text Block]	'
	The following tables present the Company’s financial assets measured at fair value on a recurring basis (in thousands):
		March 31, 2014
		Fair Value		Level 1		Level 2
	Cash equivalents:
	Commercial paper	$	41,998	$	—	$	41,998
	Municipal bonds	3,378		—		3,378
	Money market funds	1,785		1,785		—
		$	47,161	$	1,785	$	45,376
	Short-term investments:
	Municipal bonds	$	151,400	$	—	$	151,400
	Corporate bonds	14,913		—		14,913
	U.S. government and agency securities	10,005		—		10,005
	Commercial paper	5,498		—		5,498
		$	181,816	$	—	$	181,816
		December 31, 2013
		Fair Value		Level 1		Level 2
	Cash equivalents:
	Commercial paper	$	34,498	$	—	$	34,498
	U.S. government and agency securities	3,801		—		3,801
	Money market funds	37		37		—
		$	38,336	$	37	$	38,299
	Short-term investments:
	Municipal bonds	$	146,100	$	—	$	146,100
	Commercial paper	31,597		—		31,597
	Corporate bonds	7,875		—		7,875
	U.S. government and agency securities	4,995		—		4,995
		$	190,567	$	—	$	190,567

Shortterm_Investments_Tables

Short-term Investments (Tables)	3 Months Ended
	Mar. 31, 2014
Short-term Investment [Abstract]	'
Summary Of Investments In Available-For-Sale Securities [Table Text Block]	'
	The following tables present the Company’s investments in available-for-sale securities (in thousands):
		March 31, 2014
				Unrealized
		Amortized Cost		Gains		Losses			Estimated Fair Value
	Municipal bonds	$	151,360	$	44	$	(4	)	$	151,400
	Corporate bonds	14,919		1		(7		)	14,913
	U.S. government and agency securities	10,010		—		(5		)	10,005
	Commercial paper	5,498		—		—			5,498
		$	181,787	$	45	$	(16	)	$	181,816
		December 31, 2013
				Unrealized
		Amortized Cost		Gains		Losses			Estimated Fair Value
	Municipal bonds	$	146,047	$	56	$	(3	)	$	146,100
	Commercial paper	31,597		—		—			31,597
	Corporate bonds	7,873		2		—			7,875
	U.S. government and agency securities	5,002		—		(7		)	4,995
		$	190,519	$	58	$	(10	)	$	190,567

Patent_Assets_Net_Tables

Patent Assets, Net (Tables)	3 Months Ended
	Mar. 31, 2014
Patent Assets [Abstract]	'
Patent Assets, Net [Text Block]	'
	Patent assets, net consisted of the following (in thousands):
		Balance as of December 31, 2013			Additions			Assets held-for-sale			Balance as of March 31, 2014
	Patent assets	$	529,526		$	55,653		$	(11	)	$	585,168
	Accumulated amortization	(309,572		)	(27,638		)	4			(337,206		)
	Patent assets, net	$	219,954								$	247,962
Expected Future Annual Amortization Of Patent Assets [Text Block]	'
	s of March 31, 2014, the Company expects amortization expense in future periods to be as follows (in thousands):
	2014 (remainder)	$	82,312
	2015	84,497
	2016	56,524
	2017	19,879
	2018	4,688
	Thereafter	62
	Total estimated future amortization expense	$	247,962

Property_and_Equipment_Net_Tab

Property and Equipment, Net (Tables)	3 Months Ended
	Mar. 31, 2014
Property and Equipment, Net	'
Property And Equipment, Net [Table Text Block]	'
	Property and equipment, net, consisted of the following (in thousands):
		March 31,			December 31,
		2014			2013
	Internal-use software	$	4,340		$	4,198
	Leasehold improvements	1,741			1,700
	Computer, equipment and software	1,181			1,096
	Furniture and fixtures	813			813
	Construction-in-progress	154			119
	Total property and equipment, gross	8,229			7,926
	Less: Accumulated depreciation and amortization	(3,723		)	(3,259		)
	Total property and equipment, net	$	4,506		$	4,667

Intangible_Assets_Net_Tables

Intangible Assets, Net (Tables)	3 Months Ended
	Mar. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]	'
Intangible Assets, Net [Table Text Block]	'
	Intangible assets, net, consisted of the following (in thousands):
		31-Mar-14							31-Dec-13
		Carrying Amount		Accumulated Amortization			Net Carrying Amount		Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Proprietary data and models	$	1,500	$	(731	)	$	769	$	1,500	$	(637	)	$	863
	Trademarks	1,890		(1,321		)	569		1,890		(1,184		)	706
	Developed technology	728		(678		)	50		728		(625		)	103
	Customer relationships	250		(236		)	14		250		(215		)	35
	Covenant not to compete	—		—			—		480		(469		)	11
		$	4,368	$	(2,966	)	$	1,402	$	4,848	$	(3,130	)	$	1,718
Expected Future Annual Amortization Of Intangible Assets [Text Block]	'
	s of March 31, 2014, the Company expects amortization expense in future periods to be as follows (in thousands):
	2014 (remainder)	$	82,312
	2015	84,497
	2016	56,524
	2017	19,879
	2018	4,688
	Thereafter	62
	Total estimated future amortization expense	$	247,962
Intangible Assets Net [Member]	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Expected Future Annual Amortization Of Intangible Assets [Text Block]	'
	2014 (remainder)	$	590
	2015	625
	2016	187
	Total estimated future amortization expense	$	1,402

Accrued_and_Other_Current_Liab1

Accrued and Other Current Liabilities (Tables)	3 Months Ended
	Mar. 31, 2014
Accrued and Other Current Liabilities	'
Accrued And Other Current Liabilities [Table Text Block]	'
	Accrued and other current liabilities consisted of the following (in thousands):
		March 31,		December 31,
		2014		2013
	Accrued payroll-related expenses	$	3,810	$	6,791
	Accrued expenses	2,507		1,993
	Total accrued liabilities	$	6,317	$	8,784
	Patent and other assets purchased but not paid	$	—	$	563
	Other current liabilities	1,060		1,075
	Total other current liabilities	$	1,060	$	1,638

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2014
Stock-Based Compensation	'
Activity Under Equity Settled Award Plans And Related Information [Table Text Block]	'
	A summary of the Company’s activity under its equity-settled award plans and related information is as follows (in thousands, except per share data):
					Options Outstanding
		Shares Available for Grant			Number of Shares			Weighted-Average Exercise Price			Weighted-Average Remaining Contractual Life in Years	Aggregate Intrinsic Value
	Balance - December 31, 2013	2,451			4,089			$	9.91
	Shares authorized(1)	1,000			—			—
	Options exercised	—			(138	)		4.18
	Options forfeited/canceled	20			(20	)		16.26
	Restricted stock units granted	(1,098	)		—			—
	Restricted stock units forfeited	56			—			—
	Restricted stock units withheld related to net-share settlement of restricted stock units	56			—			—
	Balance - March 31, 2014	2,485			3,931			10.08			6.8	$	26,904
	Vested and exercisable - March 31, 2014				2,318			10.27			6.7	16,165
	Vested and expected to vest - March 31, 2014				3,717			10.1			6.8	25,484
Restricted Stock Unit Activity [Table Text Block]	'
	The summary of restricted stock unit activity, which includes performance-based restricted stock units with a market condition (“PBRSUs”), is as follows (in thousands, except for per share data):
		Number of Shares			Weighted-Average Grant Date Fair Value				Aggregate Intrinsic Value
	Non-vested units - December 31, 2013	2,057			$	12.38
	Granted	1,098			13.97
	Vested	(148	)		10.99
	Forfeited	(56	)		13.77
	Non-vested units - March 31, 2014	2,951			13.02				$	48,049
Weighted-Average Assumptions Used To Estimate The Fair Value Of PBRSUs [Table Text Block]	'
		Three Months Ended March 31,
		2014				2013
	Dividend yield	—		%		—		%
	Risk-free rate	1.11		%		0.62		%
	Expected volatility	48		%		55		%
	Grant date fair value	$	7.47			$	6

Segment_Reporting_Tables

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2014
Segment Reporting	'
Revenue By Location [Table Text Block]	'
	The following table presents revenue by location and revenue generated by country as a percentage of total revenue for the applicable period, for countries representing 10% or more of revenues for the periods presented (dollars in thousands):
		Three Months Ended March 31,
		2014				2013
	United States	$	37,105	60	%	$	37,567	61	%
	Japan	9,556		15		10,661		17
	Taiwan	4,885		8		6,017		10
	Other	10,342		17		6,949		12
	Total revenue	$	61,888	100	%	$	61,194	100	%
Long-Lived Assets Information By Location [Table Text Block]	'
	Long-lived assets information by location is presented below (in thousands):
		March 31,		December 31,
		2014		2013
	United States	$	4,487	$	4,646
	Japan	19		21
	Total long-lived assets	$	4,506	$	4,667

Net_Income_Available_to_Common2

Net Income Available to Common Stockholders (Detail) - Basic and Diluted Net Income Per Share Available To Common Stockholders (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Basic and Diluted Net Income Per Share Available To Common Stockholders [Abstract]	'	'
Net income	$9,860	$14,695
Allocation of net income to participating stockholders	0	-17
Net income available to common stockholders	$9,860	$14,678
Weighted-average shares used in computing basic net income available to comon stockholders	52,803	51,201
Dilutive effect of stock options and restricted stock units using the treasury-stock method	1,640	1,452
Weighted-average shares used in computing diluted net income available to common stockholders	54,443	52,653
Basic	$0.19	$0.29
Diluted	$0.18	$0.28

Net_Income_Available_to_Common3

Net Income Available to Common Stockholders (Detail) - Anti-Dilutive Securities Not Included In Diluted Shares Outstanding Calculation	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Stock options outstanding [Member]	'	'
Weighted-average anti-dilutive securities	798	2,622
Restricted stock units outstanding [Member]	'	'
Weighted-average anti-dilutive securities	60	347
Shares of common stock subject to repurchase [Member]	'	'
Weighted-average anti-dilutive securities	0	59

Fair_Value_Measurements_Detail

Fair Value Measurements (Detail) - Financial Assets Measured At Fair Value On A Recurring Basis (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Cash equivalents	'	'
Cash equivalents	$47,161	$38,336
Short-term investments	'	'
Short-term investments	181,816	190,567
Muncipal bonds [Member]	'	'
Short-term investments	'	'
Short-term investments	151,400	146,100
Corporate bonds [Member]	'	'
Short-term investments	'	'
Short-term investments	14,913	7,875
U.S. government and agency securities [Member]	'	'
Short-term investments	'	'
Short-term investments	10,005	4,995
Commercial paper [Member]	'	'
Short-term investments	'	'
Short-term investments	5,498	31,597
Commercial paper [Member]	'	'
Cash equivalents	'	'
Cash equivalents	41,998	34,498
Muncipal bonds [Member]	'	'
Cash equivalents	'	'
Cash equivalents	3,378	'
Money market funds [Member]	'	'
Cash equivalents	'	'
Cash equivalents	1,785	37
U.S. government and agency securities [Member]	'	'
Cash equivalents	'	'
Cash equivalents	'	3,801
Fair Value, Inputs, Level 1 [Member]	'	'
Cash equivalents	'	'
Cash equivalents	1,785	37
Short-term investments	'	'
Short-term investments	0	0
Fair Value, Inputs, Level 1 [Member] | Muncipal bonds [Member]	'	'
Short-term investments	'	'
Short-term investments	0	0
Fair Value, Inputs, Level 1 [Member] | Corporate bonds [Member]	'	'
Short-term investments	'	'
Short-term investments	0	0
Fair Value, Inputs, Level 1 [Member] | U.S. government and agency securities [Member]	'	'
Short-term investments	'	'
Short-term investments	0	0
Fair Value, Inputs, Level 1 [Member] | Commercial paper [Member]	'	'
Short-term investments	'	'
Short-term investments	0	0
Fair Value, Inputs, Level 1 [Member] | Commercial paper [Member]	'	'
Cash equivalents	'	'
Cash equivalents	0	0
Fair Value, Inputs, Level 1 [Member] | Muncipal bonds [Member]	'	'
Cash equivalents	'	'
Cash equivalents	0	'
Fair Value, Inputs, Level 1 [Member] | Money market funds [Member]	'	'
Cash equivalents	'	'
Cash equivalents	1,785	37
Fair Value, Inputs, Level 1 [Member] | U.S. government and agency securities [Member]	'	'
Cash equivalents	'	'
Cash equivalents	'	0
Fair Value, Inputs, Level 2 [Member]	'	'
Cash equivalents	'	'
Cash equivalents	45,376	38,299
Short-term investments	'	'
Short-term investments	181,816	190,567
Fair Value, Inputs, Level 2 [Member] | Muncipal bonds [Member]	'	'
Short-term investments	'	'
Short-term investments	151,400	146,100
Fair Value, Inputs, Level 2 [Member] | Corporate bonds [Member]	'	'
Short-term investments	'	'
Short-term investments	14,913	7,875
Fair Value, Inputs, Level 2 [Member] | U.S. government and agency securities [Member]	'	'
Short-term investments	'	'
Short-term investments	10,005	4,995
Fair Value, Inputs, Level 2 [Member] | Commercial paper [Member]	'	'
Short-term investments	'	'
Short-term investments	5,498	31,597
Fair Value, Inputs, Level 2 [Member] | Commercial paper [Member]	'	'
Cash equivalents	'	'
Cash equivalents	41,998	34,498
Fair Value, Inputs, Level 2 [Member] | Muncipal bonds [Member]	'	'
Cash equivalents	'	'
Cash equivalents	3,378	'
Fair Value, Inputs, Level 2 [Member] | Money market funds [Member]	'	'
Cash equivalents	'	'
Cash equivalents	0	0
Fair Value, Inputs, Level 2 [Member] | U.S. government and agency securities [Member]	'	'
Cash equivalents	'	'
Cash equivalents	'	$3,801

Shortterm_Investments_Detail_S

Short-term Investments (Detail) - Summary Of Investments In Available-For-Sale Securities (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Investment Holdings [Line Items]	'	'
Amortized Cost	$181,787	$190,519
Unrealized Gains	45	58
Unrealized Losses	-16	-10
Estimated Fair Value	181,816	190,567
Municipal bonds [Member]	'	'
Investment Holdings [Line Items]	'	'
Amortized Cost	151,360	146,047
Unrealized Gains	44	56
Unrealized Losses	-4	-3
Estimated Fair Value	151,400	146,100
Corporate bonds [Member]	'	'
Investment Holdings [Line Items]	'	'
Amortized Cost	14,919	7,873
Unrealized Gains	1	2
Unrealized Losses	-7	0
Estimated Fair Value	14,913	7,875
U.S. government and agency securities [Member]	'	'
Investment Holdings [Line Items]	'	'
Amortized Cost	10,010	5,002
Unrealized Gains	0	0
Unrealized Losses	-5	-7
Estimated Fair Value	10,005	4,995
Commercial paper [Member]	'	'
Investment Holdings [Line Items]	'	'
Amortized Cost	5,498	31,597
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	$5,498	$31,597

Patent_Assets_Net_Detail

Patent Assets, Net (Detail) (USD $)	3 Months Ended						69 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
			Patents [Member]	Patents [Member]	Minimum [Member]	Maximum [Member]	Weighted Average [Member]
					Patents [Member]	Patents [Member]	Patents [Member]
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'	'	'
Patent assets, useful life	'	'	'	'	'24 months	'60 months	'46 months
Amortization of patent assets	$300	$400	$27,638	$22,556	'	'	'

Patent_Assets_Net_Detail_Paten

Patent Assets, Net (Detail) - Patent Assets, Net (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]	'	'	'
Patent assets	$4,368	'	$4,848
Accumulated amortization	-2,966	'	-3,130
Patent assets - Additions	56,153	19,437	'
Amortization of patent assets	-300	-400	'
Patent assets, net	247,962	'	219,954
Patents [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Patent assets	585,168	'	529,526
Accumulated amortization	-337,206	'	-309,572
Patent assets - Additions	55,653	'	'
Patent assets - Assets held-for-sale	-11	'	'
Amortization of patent assets	-27,638	-22,556	'
Accumulated amortization - Assets held-for-sale	4	'	'
Patent assets, net	$247,962	'	$219,954

Patent_Assets_Net_Detail_Expec

Patent Assets, Net (Detail) - Expected Future Annual Amortization Expense Of Patent Assets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
2014 (remainder)	$590	'
2015	625	'
2016	187	'
Total estimated future amortization expense	247,962	219,954
Patents [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
2014 (remainder)	82,312	'
2015	84,497	'
2016	56,524	'
2017	19,879	'
2018	4,688	'
Thereafter	62	'
Total estimated future amortization expense	$247,962	$219,954

Property_and_Equipment_Net_Det

Property and Equipment, Net (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Property, Plant and Equipment [Line Items]	'	'
Depreciation and amortization expense	$28,418	$23,325
Internal-use software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Stock-based compensation capitalized as part of internal-use software	0	100
Property and equipment, types [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Depreciation and amortization expense	$500	$400

Property_and_Equipment_Net_Det1

Property and Equipment, Net (Detail) - Property And Equipment, Net (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Total property, plant and equipment, gross	$8,229	$7,926
Less: Accumulated depreciation and amortization	-3,723	-3,259
Total property and equipment, net	4,506	4,667
Internal-use software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Internal-use software	4,340	4,198
Leasehold improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Leasehold improvements	1,741	1,700
Computer, equipment and software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Computer, equipment and software	1,181	1,096
Furniture and fixtures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Furniture and fixtures	813	813
Construction-in-progress [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Construction-in-progress	$154	$119

Intangible_Assets_Net_Detail

Intangible Assets, Net (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Intangible Assets, Net	'	'
Amortization of intangible assets	$300	$400

Intangible_Assets_Net_Detail_I

Intangible Assets, Net (Detail) - Intangible Assets, Net (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	$4,368	$4,848
Accumulated amortization	-2,966	-3,130
Net carrying amount	1,402	1,718
Proprietary data and models [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	1,500	1,500
Accumulated amortization	-731	-637
Net carrying amount	769	863
Trademarks [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	1,890	1,890
Accumulated amortization	-1,321	-1,184
Net carrying amount	569	706
Developed technology [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	728	728
Accumulated amortization	-678	-625
Net carrying amount	50	103
Customer relationships [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	250	250
Accumulated amortization	-236	-215
Net carrying amount	14	35
Covenant not to compete [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	0	480
Accumulated amortization	0	-469
Net carrying amount	$0	$11

Intangible_Assets_Net_Detail_E

Intangible Assets, Net (Detail) - Estimated Future Amortization Expenses For Intangible Assets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Estimated Future Amortization Expenses for Intangible Assets [Abstract]	'	'
2014 (remainder)	$590	'
2015	625	'
2016	187	'
Total estimated future amortization expense	$1,402	$1,718

Accrued_and_Other_Current_Liab2

Accrued and Other Current Liabilities (Detail) - Accrued And Other Current Liabilities (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]	'	'
Accrued liabilities	$6,317	$8,784
Other current liabilities	1,060	1,638
Accrued payroll-related expenses [Member]	'	'
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]	'	'
Accrued liabilities	3,810	6,791
Accrued expenses [Member]	'	'
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]	'	'
Accrued liabilities	2,507	1,993
Patent and other assets purchased but not paid [Member]	'	'
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]	'	'
Other current liabilities	0	563
Other current liabilities [Member]	'	'
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]	'	'
Other current liabilities	$1,060	$1,075

Commitments_and_Contingencies_

Commitments and Contingencies (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Commitments and Contingencies Disclosure	'	'
Rent expense related to non-cancelable operating leases net of sublease income	$900,000	$600,000
Sublease income	100,000	0
Number of active insurance policies	31	'
Reserves for known and incurred but not reported claims	$600,000	'

StockBased_Compensation_Detail

Stock-Based Compensation (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Additional shares of common stock reserved for issuance under the 2011 Plan (in shares)	1,000	'
Aggregate intrinsic value of stock options exercised	$1,700	$4,000
Total fair value of stock options vested	1,700	2,200
Total fair value of RSUs vested	2,400	400
Shares withheld for tax withholdings (in shares)	56	'
Total payments for the employeesb minimum tax obligations to taxing authorities	901	0
PBRSUs granted (in shares)	200	125
Stock options [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Stock-based compensation expense	1,500	2,400
Unrecognized compensation cost related to unvested equity awards	8,900	'
Weighted-average service period of unrecognized compensation cost related to unvested equity awards	'2 years 0 months 0 days	'
Non-employee stock-based compensation expense	0	100
Restricted stock [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Stock-based compensation expense	2,200	1,100
Unrecognized compensation cost related to unvested equity awards	35,000	'
Weighted-average service period of unrecognized compensation cost related to unvested equity awards	'3 years 1 month 0 days	'
Non-employee stock-based compensation expense	0	100
Performance-based restricted stock units with a market condition [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Stock-based compensation expense	$200	$100
2011 Plan [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Additional shares of common stock reserved for issuance under the 2011 Plan (in shares)	1,000	'

StockBased_Compensation_Detail1

Stock-Based Compensation (Detail) - Activity Under Equity Award Plans And Related Information (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares Available for Grant - Outstanding (in shares)	2,451	2,485
Number of Shares - Outstanding (in shares)	4,089	3,931
Weighted-Average Exercise Price - Outstanding (in dollars per share)	$9.91	$10.08
Shares Available for Grant - Shares authorized (in shares)	1,000	'
Number of Shares - Options exercised (in shares)	-138	'
Weighted Average Exercise Price - Options exercised (in dollars per share)	$4.18	'
Shares Available for Grant - Options forfeited/canceled	20	'
Number of Shares - Options forfeited/canceled (in shares)	-20	'
Weighted-Average Exercise Price - Options forfeited/canceled (in dollars per share)	$16.26	'
Share Available for Grant - Restricted stock units granted	-1,098	'
Shares Available for Grant - Restricted stock units forfeited (in shares)	56	'
Shares Available for Grant - Restricted stock units withheld related to net-share settlement of restricted stock units	56	'
Outstanding (weighted-average contractual life)	'6 years 9 months 0 days	'
Outstanding (intrinsic value)	$26,904	'
Vested and exercisable [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Vested and exercisable (shares)	2,318	'
Vested and exercisable (in dollars per share)	$10.27	'
Vested and exercisable (weighted-average contractual life)	'6 years 8 months 0 days	'
Vested and exercisable (intrinsic value)	16,165	'
Vested and expected to vest [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Vested and expected to vest (shares)	3,717	'
Vested and expected to vest (in dollars per share)	$10.10	'
Vested and expected to vest (weighted-average contractual life)	'6 years 9 months 0 days	'
Vested and expected to vest (intrinsic value)	$25,484	'

StockBased_Compensation_Detail2

Stock-Based Compensation (Detail) - Restricted Stock Unit Activity (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
In Thousands, except Per Share data, unless otherwise specified			Restricted stock units granted [Member]	Restricted stock units vested [Member]	Restricted stock units forfeited [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Non-vested units (in shares)	2,951	2,057	'	'	'
Non-vested units (in dollars per share)	$13.02	$12.38	'	'	'
Granted (in shares)	'	'	1,098	'	'
Granted (in dollars per share)	'	'	$13.97	'	'
Vested (in shares)	'	'	'	-148	'
Vested (in dollars per share)	'	'	'	$10.99	'
Forfeited (in shares)	'	'	'	'	-56
Forfeited (in dollars per share)	'	'	'	'	$13.77
Non-vested units (in shares)	2,951	2,057	'	'	'
Non-vested units (in dollars per share)	$13.02	$12.38	'	'	'
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, intrinsic value	$48,049	'	'	'	'

StockBased_Compensation_Detail3

Stock-Based Compensation (Detail) - Weighted Average Assumptions To Estimate The Fair Value Of Equity Awards (Performance-based restricted stock units with a market condition [Member], USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Performance-based restricted stock units with a market condition [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Risk-free rate	1.11%	0.62%
Expected volatility	48.00%	55.00%
Grant date fair value	$7.47	$6

Income_Taxes_Income_Taxes_Deta

Income Taxes Income Taxes (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax [Abstract]	'	'
Effective tax rate	38.00%	36.00%

RelatedParty_Transactions_Deta

Related-Party Transactions (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Related Party Transaction [Line Items]	'	'	'
Subscription fee revenue from related party transaction	$1,400	$1,200	'
Receivables due from related parties	$0	'	$4,400

Segment_Reporting_Detail

Segment Reporting (Detail)	3 Months Ended
	Mar. 31, 2014
Segment Reporting	'
Number of reportable segments	1

Segment_Reporting_Detail_Reven

Segment Reporting (Detail) - Revenue By Location (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Total revenue (in dollars)	$61,888	$61,194
Total revenue	100.00%	100.00%
United States [Member]	'	'
United States	60.00%	61.00%
Total revenue (in dollars)	37,105	37,567
Japan [Member]	'	'
Other foreign country	15.00%	17.00%
Total revenue (in dollars)	9,556	10,661
Taiwan [Member]	'	'
Other foreign country	8.00%	10.00%
Total revenue (in dollars)	4,885	6,017
Other [Member]	'	'
Other foreign country	17.00%	12.00%
Total revenue (in dollars)	$10,342	$6,949

Segment_Reporting_Detail_Longl

Segment Reporting (Detail) - Long-lived Asset Information By Location (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'
Long-lived assets	$4,506	$4,667
United States [Member]	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'
Long-lived assets	4,487	4,646
Japan [Member]	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'
Long-lived assets	$19	$21