RPX (RPXC) 10-Q 6 Nov 13 2013 Q3 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document and Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Period Focus	'Q3	'
Document Fiscal Year Focus	'2013	'
Trading Symbol	'RPXC	'
Entity Registrant Name	'RPX Corporation	'
Entity Central Index Key	'0001509432	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	52,474,936

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$132,614	$73,638
Short-term investments	144,993	126,092
Restricted cash	364	0
Accounts receivable	19,885	25,144
Other receivables	0	33,775
Prepaid expenses and other current assets	9,733	5,237
Deferred tax assets	8,824	7,658
Total current assets	316,413	271,544
Patent assets, net	210,658	199,314
Property and equipment, net	4,790	3,144
Intangible assets, net	2,088	3,226
Goodwill	16,460	16,460
Restricted cash, less current portion	1,454	0
Other assets	774	279
Total assets	552,637	493,967
Current liabilities:	'	'
Accounts payable	711	568
Accrued liabilities	7,050	7,206
Deferred revenue	101,801	101,249
Deferred payment obligations	500	500
Other current liabilities	6,322	1,813
Total current liabilities	116,384	111,336
Deferred revenue, less current portion	3,429	3,122
Deferred tax liabilities	17,091	18,108
Other liabilities	3,142	1,142
Total liabilities	140,046	133,708
Stockholders' equity:	'	'
Common stock	5	5
Additional paid-in capital	299,995	281,530
Retained earnings	112,533	78,744
Accumulated other comprehensive income (loss)	58	-20
Total stockholders' equity	412,591	360,259
Total liabilities and stockholders' equity	$552,637	$493,967

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue	$58,554	$47,044	$177,229	$146,131
Cost of revenue	29,766	21,980	78,130	60,508
Selling, general and administrative expenses	15,584	13,147	45,793	39,903
(Gain) loss on sale of patent assets, net	0	0	126	-177
Operating income	13,204	11,917	53,180	45,897
Other income, net	56	65	170	92
Income before provision for income taxes	13,260	11,982	53,350	45,989
Provision for income taxes	4,863	4,392	19,561	17,130
Net income	8,397	7,590	33,789	28,859
Net income available to common stockholders:	'	'	'	'
Basic	8,395	7,556	33,767	28,378
Diluted	$8,395	$7,557	$33,767	$28,399
Net income available to common stockholders per common share:	'	'	'	'
Basic	$0.16	$0.15	$0.65	$0.57
Diluted	$0.16	$0.14	$0.63	$0.55
Weighted-average shares used in computing net income available to common stockholders per common share:	'	'	'	'
Basic	52,267	50,457	51,751	49,410
Diluted	54,055	52,127	53,415	51,711

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$8,397	$7,590	$33,789	$28,859
Unrealized gains (losses) on available-for-sale securities:	'	'	'	'
Unrealized holding gains (losses) arising during the period	20	38	77	34
Less: reclassification adjustment for (gains) losses included in net income	0	-11	1	-12
Net unrealized gains (losses) on available-for-sale securities, net of tax	20	27	78	22
Comprehensive income	$8,417	$7,617	$33,867	$28,881

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities	'	'
Net income	$33,789	$28,859
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	76,767	61,208
Stock-based compensation	12,081	7,493
Excess tax benefit from stock-based compensation	-2,752	-5,796
Imputed interest on deferred payment obligations	0	94
(Gain) loss on sale of patent assets	126	-177
Amortization of premium on investments	4,496	3,773
Deferred taxes	-2,772	-1,534
Other	13	-19
Changes in assets and liabilities:	'	'
Accounts receivable	5,259	3,163
Other receivables	33,775	0
Prepaid expenses and other assets	-6,392	5,874
Deposit	0	-10,000
Accounts payable	143	225
Accrued and other liabilities	1,134	-2,856
Deferred revenue	859	-9,642
Net cash provided by operating activities	156,526	80,665
Cash flows from investing activities	'	'
Purchases of investments classified as available-for-sale	-134,155	-150,227
Maturities of investments classified as available-for-sale	115,122	153,920
Sales of investments classified available-for-sale securities	1,099	0
Business acquisition	0	-45,765
(Increase) decrease in restricted cash	-1,818	647
Purchases of intangible assets	0	-52
Purchases of property and equipment	-2,073	-1,626
Acquisitions of patent assets	-82,751	-65,056
Proceeds from sale of patent assets	100	200
Net cash used in investing activities	-104,476	-107,959
Cash flows from financing activities	'	'
Repayments of principal on deferred payment obligations	0	-5,150
Proceeds from other obligations	0	500
Proceeds from exercise of stock options and other common stock issuances	4,174	2,839
Excess tax benefit from stock-based compensation	2,752	5,796
Net cash provided by financing activities	6,926	3,985
Net increase (decrease) in cash and cash equivalents	58,976	-23,309
Cash and cash equivalents at beginning of period	73,638	106,749
Cash and cash equivalents at end of period	132,614	83,440
Non-cash investing and financing activities	'	'
Change in patent assets purchased and accrued but not paid	3,400	250
Change in fixed assets purchased and accrued but not paid	681	0
Change in other assets purchased and accrued but not paid	500	565
Intangible assets received in barter transactions	$0	$54

Nature_of_Business

Nature of Business	9 Months Ended
	Sep. 30, 2013
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 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 and nine months ended September 30, 2013, 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	9 Months Ended
	Sep. 30, 2013
Basis of Presentation and Significant Accounting Policies	'
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 September 30, 2013, the condensed consolidated statements of operations and the condensed consolidated statements of comprehensive income for the three and nine months ended September 30, 2013 and 2012, and the condensed consolidated statements of cash flows for the nine months ended September 30, 2013 and 2012, are unaudited. The condensed consolidated balance sheet as of December 31, 2012 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, 2012, which was filed with the Securities and Exchange Commission (“SEC”) on March 11, 2013. 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, 2012.
	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 and nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for any subsequent interim period or for the year ending December 31, 2013.
	Recently Adopted Accounting Standards
	In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2013-02, Reporting of Amounts of Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”), which amends Comprehensive Income (Topic 220) in the Accounting Standards Codification (“ASC”). These amendments require an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. The amendments in ASU 2013-02 are effective for the Company’s interim and annual fiscal periods beginning January 1, 2013. The adoption of ASU 2013-02 did not have a material impact on the Company’s consolidated financial statements.
	In October 2012, the FASB issued ASU 2012-04, Technical Corrections and Improvements (“ASU 2012-04”), which amends a wide range of topics in the ASC. These amendments include technical corrections and improvements to the ASC and conforming amendments related to fair value measurements. The amendments in ASU 2012-04 are effective for the Company’s interim and annual fiscal periods beginning January 1, 2013. The adoption of ASU 2012-04 did not have a material impact on the Company’s consolidated financial statements.
	In July 2012, the FASB issued ASU 2012-02, Intangibles - Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment (“ASU 2012-02”), which amends ASU 2011-08, Intangibles - Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment and permits an entity to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform the quantitative impairment test in accordance with Subtopic 350-30, Intangibles - Goodwill and Other - General Intangibles Other than Goodwill. The amendments in ASU 2012-02 are effective for the Company’s interim and annual fiscal periods beginning January 1, 2013. The adoption of ASU 2012-02 did not have a material impact on the Company’s consolidated financial statements. As of September 30, 2013, the date of the Company’s 2013 annual assessment, the Company’s implied fair value was substantially in excess of its net book value, including goodwill. As such, the Company did not recognize an impairment charge during the three months ended September 30, 2013.

Net_Income_Available_to_Common

Net Income Available to Common Stockholders	9 Months Ended
	Sep. 30, 2013
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 per share data):
		Three Months Ended September 30,							Nine Months Ended September 30,
		2013				2012			2013			2012
	Net income available to common stockholders:
	Numerator:
	Basic:
	Net income	$	8,397			$	7,590		$	33,789		$	28,859
	Allocation of net income to participating stockholders	(2		)		(34		)	(22		)	(481		)
	Net income available to common stockholders – basic	$	8,395			$	7,556		$	33,767		$	28,378
	Diluted:
	Net income available to common stockholders – basic	$	8,395			$	7,556		$	33,767		$	28,378
	Undistributed earnings re-allocated to common stockholders	—				1			—			21
	Net income available to common stockholders – diluted	$	8,395			$	7,557		$	33,767		$	28,399
	Denominator:
	Basic shares:
	Weighted-average shares used in computing basic net income available to common stockholders	52,267				50,457			51,751			49,410
	Diluted shares:
	Weighted-average shares used in computing basic net income available to common stockholders	52,267				50,457			51,751			49,410
	Dilutive effect of stock options and restricted stock units using treasury-stock method	1,788				1,670			1,664			2,301
	Weighted-average shares used in computing diluted net income available to common stockholders	54,055				52,127			53,415			51,711
	Net income per common share available to common stockholders:
	Basic	$	0.16			$	0.15		$	0.65		$	0.57
	Diluted	$	0.16			$	0.14		$	0.63		$	0.55
	For the three and nine months ended September 30, 2013 and 2012, 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 September 30,						Nine Months Ended September 30,
		2013			2012			2013		2012
	Weighted-average:
	Stock options outstanding	1,059			2,927			1,360		1,508
	Restricted stock units outstanding	143			483			255		378
	Shares of common stock subject to repurchase	13			227			34		838

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2013
Fair Value Measurements [Abstract]	'
Fair Value Measurements [Text Block]	'
	Fair Value Measurements
	The following tables present the financial assets measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 (in thousands):
		September 30, 2013
		Fair Value		Level 1		Level 2
	Cash equivalents
	Commercial paper	$	56,198	$	—	$	56,198
	Money market funds	24,534		24,534		—
	Municipal bonds	3,127		—		3,127
		$	83,859	$	24,534	$	59,325
	Short-term investments
	Municipal bonds	$	128,573	$	—	$	128,573
	Corporate bonds	7,922		—		7,922
	Commercial paper	5,497		—		5,497
	U.S. government and agency securities	3,001		—		3,001
		$	144,993	$	—	$	144,993
		December 31, 2012
		Fair Value		Level 1		Level 2
	Cash equivalents
	Commercial paper	$	19,800	$	—	$	19,800
	Money market funds	14,670		14,670		—
	U.S. government and agency securities	9,000		—		9,000
	Municipal bonds	3,992		—		3,992
		$	47,462	$	14,670	$	32,792
	Short-term investments
	Municipal bonds	$	105,515	$	—	$	105,515
	Commercial paper	13,697		—		13,697
	Corporate bonds	6,880		—		6,880
		$	126,092	$	—	$	126,092
	As of September 30, 2013 and December 31, 2012, the Company did not use level 3 inputs to measure financial assets or liabilities at fair value.

Shortterm_Investments

Short-term Investments	9 Months Ended
	Sep. 30, 2013
Short-term Investment [Abstract]	'
Short-term Investments [Text Block]	'
	Short-term Investments
	The following table summarizes the Company’s investments in available-for-sale securities as of September 30, 2013 and December 31, 2012 (in thousands):
		September 30, 2013
				Unrealized
		Amortized Cost		Gains		Losses			Estimated Fair Value
	Municipal bonds	$	128,517	$	56	$	—		$	128,573
	Corporate bonds	7,920		2		—			7,922
	Commercial paper	5,497		—		—			5,497
	U.S. government and agency securities	3,001		—		—			3,001
		$	144,935	$	58	$	—		$	144,993
		December 31, 2012
				Unrealized
		Amortized Cost		Gains		Losses			Estimated Fair Value
	Municipal bonds	$	105,536	$	1	$	(22	)	$	105,515
	Commercial paper	13,697		—		—			13,697
	Corporate bonds	6,880		—		—			6,880
		$	126,113	$	1	$	(22	)	$	126,092
	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 (loss). Realized gains and losses on available-for-sale securities are included in other income, net in the Company’s condensed consolidated statements of operations and have not been material for all periods presented.
	The weighted-average remaining maturity of the Company’s investment portfolio was less than one year as of September 30, 2013 and December 31, 2012. As of September 30, 2013, no individual securities incurred continuous unrealized losses for greater than 12 months.

Patent_Assets_Net

Patent Assets, Net	9 Months Ended
	Sep. 30, 2013
Patent Assets [Abstract]	'
Patent Assets, Net [Text Block]	'
	Patent Assets, Net
	Patent assets, net, consisted of the following (in thousands):
		December 31,			Additions			Disposals			September 30,
		2012									2013
	Patent assets	$	403,875		$	86,151		$	(850	)	$	489,176
	Accumulated amortization	(204,561		)	(74,479		)	522			(278,518		)
	Patent assets, net	$	199,314								$	210,658
	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 September 30, 2013, the estimated economic useful lives of the Company’s patent assets generally ranged from 24 to 60 months. As of September 30, 2013, the weighted-average estimated economic useful life at the time of acquisition of all patent assets acquired since the Company’s inception, excluding fully amortized patent assets, was 44 months.
	The following table summarizes the expected future annual amortization expense of patent assets as of September 30, 2013 (in thousands):
	2013 (remainder)	$	25,715
	2014	81,411
	2015	59,348
	2016	33,553
	2017	9,263
	Thereafter	1,368
	Total estimated future amortization expense	$	210,658
	Amortization expense was $28.2 million and $21.5 million for the three months ended September 30, 2013 and 2012, respectively, and $74.5 million and $59.2 million for the nine months ended September 30, 2013 and 2012, respectively.

Property_and_Equipment_Net

Property and Equipment, Net	9 Months Ended
	Sep. 30, 2013
Property and Equipment, Net	'
Property and Equipment, Net [Text Block]	'
	Property and Equipment, Net
	Property and equipment, net, consisted of the following (in thousands):
		September 30,			December 31,
		2013			2012
	Internal-use software	$	3,980		$	3,078
	Computer, equipment and software	1,074			960
	Furniture and fixtures	675			662
	Leasehold improvements	88			162
	Construction-in-progress	1,794			15
	Total property and equipment, gross	7,611			4,877
	Less: Accumulated depreciation and amortization	(2,821		)	(1,733		)
	Total property and equipment, net	$	4,790		$	3,144
	Depreciation and amortization expense was $0.4 million for both the three months ended September 30, 2013 and 2012, and $1.2 million and $0.9 million for the nine months ended September 30, 2013 and 2012, 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 September 30, 2013 and 2012, respectively, and nil and $0.3 million for the nine months ended September 30, 2013 and 2012, respectively.

Intangible_Assets_Net

Intangible Assets, Net	9 Months Ended
	Sep. 30, 2013
Intangible Assets, Net	'
Intangible Assets, Net [Text Block]	'
	Intangible Assets, Net
	Intangible assets, net, as of September 30, 2013 and December 31, 2012 consisted of the following (in thousands):
		September 30, 2013							December 31, 2012
		Carrying Amount		Accumulated Amortization			Net Carrying Amount		Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Trademarks	$	1,890	$	(1,047	)	$	843	$	1,890	$	(637	)	$	1,253
	Proprietary data and models	1,500		(544		)	956		1,500		(264		)	1,236
	Developed technology	728		(564		)	164		728		(380		)	348
	Covenant not to compete	480		(411		)	69		480		(222		)	258
	Customer relationships	250		(194		)	56		250		(132		)	118
	Other intangible assets	1,450		(1,450		)	—		1,450		(1,450		)	—
	Intangible assets in-progress	—		—			—		13		—			13
	Total intangible assets, net	$	6,298	$	(4,210	)	$	2,088	$	6,311	$	(3,085	)	$	3,226
	The estimated future amortization expenses for intangible assets as of September 30, 2013 are summarized below (in thousands):
	2013 (remainder)	$	369
	2014	906
	2015	625
	2016	188
	Total estimated future amortization expense	$	2,088
	Amortization expense was $0.3 million and $0.4 million for the three months ended September 30, 2013 and 2012, respectively, and $1.1 million for both the nine months ended September 30, 2013 and 2012.

Accrued_and_Other_Current_Liab

Accrued and Other Current Liabilities	9 Months Ended
	Sep. 30, 2013
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):
		September 30,		December 31,
		2013		2012
	Accrued payroll-related expenses	$	5,044	$	6,567
	Accrued expenses	2,006		639
	Total accrued liabilities	$	7,050	$	7,206
	Patent and other assets purchased but not paid	$	5,000	$	1,100
	Other current liabilities	1,322		713
	Total other current liabilities	$	6,322	$	1,813

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
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 its contractual obligations or commitments during the nine months ended September 30, 2013 as presented under the heading “Commitments and Contingencies” in Note 14 of the Notes to Consolidated Financial Statements in Part II, Item 8. “Consolidated Financial Statements and Supplementary Data” included in the Annual Report on Form 10-K for its fiscal year ended December 31, 2012.
	Rent expense related to non-cancelable operating leases was $1.1 million and $0.6 million for the three months ended September 30, 2013 and 2012, respectively, and $2.5 million and $1.8 million for the nine months ended September 30, 2013 and 2012, 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 legal 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 legal contingencies was recorded as of September 30, 2013 or December 31, 2012.
	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.  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 range of the potential loss that may result from this litigation.
	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. Accordingly, the Company had no liabilities recorded for these agreements as of September 30, 2013 or December 31, 2012. 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 September 30, 2013, the Company has a total of 23 active policies and has recorded a reserve for known and incurred but not reported claims that represent estimated claim costs and related expenses. Such estimates are based on individual case estimates for the reserve for known and incurred but not reported claims and estimates of incurred but not reported losses. The financial statement impact of the reserve for known and incurred but not reported claims was not material to the Company’s results of operations for the three and nine months ended September 30, 2013 or financial condition as of September 30, 2013.
	The Company regularly reviews loss reserves using a variety of actuarial techniques and updates them as its loss experience develops. Any changes in estimates are reflected in the Company’s operating results for the period in which the estimates are changed.
	Patent Asset Purchase Commitments
	During the three months ended September 30, 2013, the Company entered into various agreements to acquire patent assets for an aggregate purchase price of $7.1 million. Pursuant to these agreements, the Company paid the applicable purchase price and acquired the patent assets in October 2013.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2013
Stock-Based Compensation	'
Stockholders' Equity [Text Block]	'
	Stockholders’ Equity
	Equity Plans
	A summary of the Company’s activity under its equity 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, 2012	3,023		5,710		$	8.85
	Shares authorized	1,000		—		—
	Options granted	(100	)	100		13.26
	Options exercised	—		(1,060	)	3.92
	Options forfeited	416		(416	)	11.13
	Restricted stock units granted	(2,256	)	—		—
	Restricted stock units forfeited	350		—		—
	Balance - September 30, 2013	2,433		4,334		$	9.94		7.2	$	35,624
	Vested and exercisable - September 30, 2013			2,065		$	10.28		7	$	17,080
	Vested and expected to vest - September 30, 2013			4,087		$	9.95		7.2	$	33,674
	The total intrinsic value for options exercised during the three months ended September 30, 2013 and 2012 was $2.6 million and $3.2 million, respectively, and $11.3 million and $21.9 million for options exercised during the nine months ended September 30, 2013 and 2012, respectively.
	Restricted Stock Units
	The summary of restricted stock unit activity is as follows:
		Number of Shares		Weighted-Average Grant Date Fair Value			Aggregate Intrinsic Value
	Non-vested units - December 31, 2012	471		$	17.27
	Granted	2,256		11.26
	Vested	(301	)	13.77
	Forfeited	(350	)	12.13
	Non-vested units - September 30, 2013	2,076		12.11			$	36,423
	Stock-Based Compensation Related to Employees and Non-Employee Directors
	Stock-based compensation expense for employees and non-employee directors is based on the fair value of the award on the date of grant and is recognized on a straight-line basis over the requisite service period of the award. The Company estimates the fair value of stock options using the Black-Scholes option pricing model. Option valuation models, including the Black-Scholes option pricing model, require the input of various assumptions such as expected term, expected volatility and risk-free interest rates. Changes in the assumptions can materially affect the fair value and ultimately how much stock-based compensation expense is recognized. These inputs are subjective and generally require significant analysis and judgment to develop. For all stock options granted to date, the Company calculated the expected term using the SEC simplified method. The Company has limited information on its past volatility and has a limited operating history. Therefore, it has estimated volatility by evaluating the historical volatility of publicly traded industry peer companies. For purposes of identifying these peer companies, the Company considered the industry, stage of development, size and financial leverage of potential comparable companies. The estimated forfeiture rate is derived from the Company’s historical data, and the risk-free interest rate is based on the yield available on U.S. Treasury zero-coupon issues similar in duration to the expected term of the Company’s stock options.
	There were no stock options granted to employees or non-employee directors during the three months ended September 30, 2013 or 2012. The weighted-average assumptions used to estimate the fair value of stock options granted to employees and non-employee directors during the nine months ended September 30, 2013 and 2012 and the resulting fair values are as follows:
			Nine Months Ended September 30,
			2013	2012
	Dividend yield		—%	—%
	Risk-free rate		0.93%	1.11%
	Expected volatility		61%	61%
	Expected term (in years)		6.1	6
	Grant date fair value		$7.39	$9.02
	The fair value of restricted stock units granted to employees and non-employee directors is measured by reference to the fair value of the underlying shares on the date of grant.
	Stock-based compensation expense related to stock options granted to employees and non-employee directors was $1.8 million for both the three months ended September 30, 2013 and 2012, and $6.7 million and $5.7 million for the nine months ended September 30, 2013 and 2012, respectively. Stock-based compensation expense related to restricted stock units granted to employees and non-employee directors was $2.1 million and $0.6 million for the three months ended September 30, 2013 and 2012, respectively, and $5.1 million and $1.5 million for the nine months ended September 30, 2013 and 2012, respectively.
	As of September 30, 2013, there was $12.4 million and $23.3 million of unrecognized compensation cost related to stock options and restricted stock units, respectively, which was expected to be recognized over a weighted-average period of 2.2 years and 3.1 years, respectively.
	Stock-Based Compensation Related to Non-Employees
	The Company periodically grants equity awards to non-employees in exchange for goods and services. No awards were granted to non-employees in exchange for goods and services during the three or nine months ended September 30, 2013 and 2012, respectively.
	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 options or restricted stock units is revalued until the awards vest on the measurement date.
	Non-employee stock-based compensation expense related to stock options was $0.1 million for both the three months ended September 30, 2013 and 2012, and $0.2 million and $0.3 million for the nine months ended September 30, 2013 and 2012, respectively. Non-employee stock-based compensation expense related to restricted stock units was nil and $0.1 million for the three months ended September 30, 2013 and 2012, respectively, and $0.2 million and $0.3 million for the nine months ended September 30, 2013 and 2012, respectively.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2013
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 37% for each of the three and nine months ended September 30, 2013 and 2012.
	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 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	9 Months Ended
	Sep. 30, 2013
Related-Party Transactions	'
Related Party Transactions [Text Block]	'
	Related-Party Transactions
	During the three and nine months ended September 30, 2013, four members of the Company’s Board of Directors also served on the boards of directors of RPX clients. During the three and nine months ended September 30, 2012, two 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 $1.3 million and $0.9 million for the three months ended September 30, 2013 and 2012, respectively, and $3.8 million and $2.5 million for the nine months ended September 30, 2013 and 2012, respectively. As of September 30, 2013 and December 31, 2012, there were no receivables due from these clients.

Segment_Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2013
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 any of the periods presented (dollars in thousands):
		Three Months Ended September 30,								Nine Months Ended September 30,
		2013				2012				2013				2012
	United States	$	35,842	61	%	$	26,974	57	%	$	108,445	61	%	$	82,066	56	%
	Japan	9,531		16		10,226		22		29,623		17		29,600		20
	Other	13,181		23		9,844		21		39,161		22		34,465		24
	Total revenue	$	58,554	100	%	$	47,044	100	%	$	177,229	100	%	$	146,131	100	%
	Long-lived asset information by location is presented below (in thousands):
		September 30,		December 31,
		2013		2012
	United States	$	4,769	$	3,116
	Japan	21		28
	Total long-lived assets	$	4,790	$	3,144

Basis_of_Presentation_and_Sign1

Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
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 September 30, 2013, the condensed consolidated statements of operations and the condensed consolidated statements of comprehensive income for the three and nine months ended September 30, 2013 and 2012, and the condensed consolidated statements of cash flows for the nine months ended September 30, 2013 and 2012, are unaudited. The condensed consolidated balance sheet as of December 31, 2012 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, 2012, which was filed with the Securities and Exchange Commission (“SEC”) on March 11, 2013. 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, 2012.
	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 and nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for any subsequent interim period or for the year ending December 31, 2013.
Recently Adopted Accounting Standards [Policy Text Block]	'
	Recently Adopted Accounting Standards
	In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2013-02, Reporting of Amounts of Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”), which amends Comprehensive Income (Topic 220) in the Accounting Standards Codification (“ASC”). These amendments require an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. The amendments in ASU 2013-02 are effective for the Company’s interim and annual fiscal periods beginning January 1, 2013. The adoption of ASU 2013-02 did not have a material impact on the Company’s consolidated financial statements.
	In October 2012, the FASB issued ASU 2012-04, Technical Corrections and Improvements (“ASU 2012-04”), which amends a wide range of topics in the ASC. These amendments include technical corrections and improvements to the ASC and conforming amendments related to fair value measurements. The amendments in ASU 2012-04 are effective for the Company’s interim and annual fiscal periods beginning January 1, 2013. The adoption of ASU 2012-04 did not have a material impact on the Company’s consolidated financial statements.
	In July 2012, the FASB issued ASU 2012-02, Intangibles - Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment (“ASU 2012-02”), which amends ASU 2011-08, Intangibles - Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment and permits an entity to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform the quantitative impairment test in accordance with Subtopic 350-30, Intangibles - Goodwill and Other - General Intangibles Other than Goodwill. The amendments in ASU 2012-02 are effective for the Company’s interim and annual fiscal periods beginning January 1, 2013. The adoption of ASU 2012-02 did not have a material impact on the Company’s consolidated financial statements. As of September 30, 2013, the date of the Company’s 2013 annual assessment, the Company’s implied fair value was substantially in excess of its net book value, including goodwill. As such, the Company did not recognize an impairment charge during the three months ended September 30, 2013.

Net_Income_Available_to_Common1

Net Income Available to Common Stockholders (Tables)	9 Months Ended
	Sep. 30, 2013
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 per share data):
		Three Months Ended September 30,							Nine Months Ended September 30,
		2013				2012			2013			2012
	Net income available to common stockholders:
	Numerator:
	Basic:
	Net income	$	8,397			$	7,590		$	33,789		$	28,859
	Allocation of net income to participating stockholders	(2		)		(34		)	(22		)	(481		)
	Net income available to common stockholders – basic	$	8,395			$	7,556		$	33,767		$	28,378
	Diluted:
	Net income available to common stockholders – basic	$	8,395			$	7,556		$	33,767		$	28,378
	Undistributed earnings re-allocated to common stockholders	—				1			—			21
	Net income available to common stockholders – diluted	$	8,395			$	7,557		$	33,767		$	28,399
	Denominator:
	Basic shares:
	Weighted-average shares used in computing basic net income available to common stockholders	52,267				50,457			51,751			49,410
	Diluted shares:
	Weighted-average shares used in computing basic net income available to common stockholders	52,267				50,457			51,751			49,410
	Dilutive effect of stock options and restricted stock units using treasury-stock method	1,788				1,670			1,664			2,301
	Weighted-average shares used in computing diluted net income available to common stockholders	54,055				52,127			53,415			51,711
	Net income per common share available to common stockholders:
	Basic	$	0.16			$	0.15		$	0.65		$	0.57
	Diluted	$	0.16			$	0.14		$	0.63		$	0.55
Anti-Dilutive Securities Not Included In Diluted Shares Outstanding Calculation [Table Text Block]	'
	For the three and nine months ended September 30, 2013 and 2012, 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 September 30,						Nine Months Ended September 30,
		2013			2012			2013		2012
	Weighted-average:
	Stock options outstanding	1,059			2,927			1,360		1,508
	Restricted stock units outstanding	143			483			255		378
	Shares of common stock subject to repurchase	13			227			34		838

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Measurements	'
Finance Assets Measured At Fair Value On A Recurring Basis [Table Text Block]	'
	The following tables present the financial assets measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 (in thousands):
		September 30, 2013
		Fair Value		Level 1		Level 2
	Cash equivalents
	Commercial paper	$	56,198	$	—	$	56,198
	Money market funds	24,534		24,534		—
	Municipal bonds	3,127		—		3,127
		$	83,859	$	24,534	$	59,325
	Short-term investments
	Municipal bonds	$	128,573	$	—	$	128,573
	Corporate bonds	7,922		—		7,922
	Commercial paper	5,497		—		5,497
	U.S. government and agency securities	3,001		—		3,001
		$	144,993	$	—	$	144,993
		December 31, 2012
		Fair Value		Level 1		Level 2
	Cash equivalents
	Commercial paper	$	19,800	$	—	$	19,800
	Money market funds	14,670		14,670		—
	U.S. government and agency securities	9,000		—		9,000
	Municipal bonds	3,992		—		3,992
		$	47,462	$	14,670	$	32,792
	Short-term investments
	Municipal bonds	$	105,515	$	—	$	105,515
	Commercial paper	13,697		—		13,697
	Corporate bonds	6,880		—		6,880
		$	126,092	$	—	$	126,092

Shortterm_Investments_Tables

Short-term Investments (Tables)	9 Months Ended
	Sep. 30, 2013
Short-term Investment [Abstract]	'
Summary Of Investments In Available-For-Sale Securities [Table Text Block]	'
	The following table summarizes the Company’s investments in available-for-sale securities as of September 30, 2013 and December 31, 2012 (in thousands):
		September 30, 2013
				Unrealized
		Amortized Cost		Gains		Losses			Estimated Fair Value
	Municipal bonds	$	128,517	$	56	$	—		$	128,573
	Corporate bonds	7,920		2		—			7,922
	Commercial paper	5,497		—		—			5,497
	U.S. government and agency securities	3,001		—		—			3,001
		$	144,935	$	58	$	—		$	144,993
		December 31, 2012
				Unrealized
		Amortized Cost		Gains		Losses			Estimated Fair Value
	Municipal bonds	$	105,536	$	1	$	(22	)	$	105,515
	Commercial paper	13,697		—		—			13,697
	Corporate bonds	6,880		—		—			6,880
		$	126,113	$	1	$	(22	)	$	126,092

Patent_Assets_Net_Tables

Patent Assets, Net (Tables)	9 Months Ended
	Sep. 30, 2013
Patent Assets [Abstract]	'
Patent Assets, Net [Text Block]	'
	Patent assets, net, consisted of the following (in thousands):
		December 31,			Additions			Disposals			September 30,
		2012									2013
	Patent assets	$	403,875		$	86,151		$	(850	)	$	489,176
	Accumulated amortization	(204,561		)	(74,479		)	522			(278,518		)
	Patent assets, net	$	199,314								$	210,658
Expected Future Annual Amortization Of Patent Assets [Text Block]	'
	The following table summarizes the expected future annual amortization expense of patent assets as of September 30, 2013 (in thousands):
	2013 (remainder)	$	25,715
	2014	81,411
	2015	59,348
	2016	33,553
	2017	9,263
	Thereafter	1,368
	Total estimated future amortization expense	$	210,658

Property_and_Equipment_Net_Tab

Property and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2013
Property and Equipment, Net	'
Property And Equipment, Net [Table Text Block]	'
	Property and equipment, net, consisted of the following (in thousands):
		September 30,			December 31,
		2013			2012
	Internal-use software	$	3,980		$	3,078
	Computer, equipment and software	1,074			960
	Furniture and fixtures	675			662
	Leasehold improvements	88			162
	Construction-in-progress	1,794			15
	Total property and equipment, gross	7,611			4,877
	Less: Accumulated depreciation and amortization	(2,821		)	(1,733		)
	Total property and equipment, net	$	4,790		$	3,144

Intangible_Assets_Net_Tables

Intangible Assets, Net (Tables)	9 Months Ended
	Sep. 30, 2013
Acquired Finite-Lived Intangible Assets [Line Items]	'
Intangible Assets, Net [Table Text Block]	'
	Intangible assets, net, as of September 30, 2013 and December 31, 2012 consisted of the following (in thousands):
		September 30, 2013							December 31, 2012
		Carrying Amount		Accumulated Amortization			Net Carrying Amount		Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Trademarks	$	1,890	$	(1,047	)	$	843	$	1,890	$	(637	)	$	1,253
	Proprietary data and models	1,500		(544		)	956		1,500		(264		)	1,236
	Developed technology	728		(564		)	164		728		(380		)	348
	Covenant not to compete	480		(411		)	69		480		(222		)	258
	Customer relationships	250		(194		)	56		250		(132		)	118
	Other intangible assets	1,450		(1,450		)	—		1,450		(1,450		)	—
	Intangible assets in-progress	—		—			—		13		—			13
	Total intangible assets, net	$	6,298	$	(4,210	)	$	2,088	$	6,311	$	(3,085	)	$	3,226
Expected Future Annual Amortization Of Intangible Assets [Text Block]	'
	The following table summarizes the expected future annual amortization expense of patent assets as of September 30, 2013 (in thousands):
	2013 (remainder)	$	25,715
	2014	81,411
	2015	59,348
	2016	33,553
	2017	9,263
	Thereafter	1,368
	Total estimated future amortization expense	$	210,658
Intangible Assets Net [Member]	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Expected Future Annual Amortization Of Intangible Assets [Text Block]	'
	The estimated future amortization expenses for intangible assets as of September 30, 2013 are summarized below (in thousands):
	2013 (remainder)	$	369
	2014	906
	2015	625
	2016	188
	Total estimated future amortization expense	$	2,088

Accrued_and_Other_Current_Liab1

Accrued and Other Current Liabilities (Tables)	9 Months Ended
	Sep. 30, 2013
Accrued and Other Current Liabilities	'
Accrued And Other Current Liabilities [Table Text Block]	'
	Accrued and other current liabilities consisted of the following (in thousands):
		September 30,		December 31,
		2013		2012
	Accrued payroll-related expenses	$	5,044	$	6,567
	Accrued expenses	2,006		639
	Total accrued liabilities	$	7,050	$	7,206
	Patent and other assets purchased but not paid	$	5,000	$	1,100
	Other current liabilities	1,322		713
	Total other current liabilities	$	6,322	$	1,813

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2013
Stock-Based Compensation	'
Activity Under Equity Award Plans And Related Information [Table Text Block]	'
	A summary of the Company’s activity under its equity 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, 2012	3,023		5,710		$	8.85
	Shares authorized	1,000		—		—
	Options granted	(100	)	100		13.26
	Options exercised	—		(1,060	)	3.92
	Options forfeited	416		(416	)	11.13
	Restricted stock units granted	(2,256	)	—		—
	Restricted stock units forfeited	350		—		—
	Balance - September 30, 2013	2,433		4,334		$	9.94		7.2	$	35,624
	Vested and exercisable - September 30, 2013			2,065		$	10.28		7	$	17,080
	Vested and expected to vest - September 30, 2013			4,087		$	9.95		7.2	$	33,674
Restricted Stock Unit Activity [Table Text Block]	'
	The summary of restricted stock unit activity is as follows:
		Number of Shares		Weighted-Average Grant Date Fair Value			Aggregate Intrinsic Value
	Non-vested units - December 31, 2012	471		$	17.27
	Granted	2,256		11.26
	Vested	(301	)	13.77
	Forfeited	(350	)	12.13
	Non-vested units - September 30, 2013	2,076		12.11			$	36,423
Weighted-Average Assumptions Used To Estimate The Fair Value Of Stock Options [Table Text Block]	'
			Nine Months Ended September 30,
			2013	2012
	Dividend yield		—%	—%
	Risk-free rate		0.93%	1.11%
	Expected volatility		61%	61%
	Expected term (in years)		6.1	6
	Grant date fair value		$7.39	$9.02

Segment_Reporting_Tables

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2013
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 any of the periods presented (dollars in thousands):
		Three Months Ended September 30,								Nine Months Ended September 30,
		2013				2012				2013				2012
	United States	$	35,842	61	%	$	26,974	57	%	$	108,445	61	%	$	82,066	56	%
	Japan	9,531		16		10,226		22		29,623		17		29,600		20
	Other	13,181		23		9,844		21		39,161		22		34,465		24
	Total revenue	$	58,554	100	%	$	47,044	100	%	$	177,229	100	%	$	146,131	100	%
Long-Lived Assets Information By Location [Table Text Black]	'Long-lived asset information by location is presented below (in thousands):B SeptemberB 30, 2013B DecemberB 31, 2012United States$4,769B $3,116Japan21B 28Total long-lived assets$4,790B $3,144

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		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Basic and Diluted Net Income Per Share Available To Common Stockholders [Abstract]	'	'	'	'
Net income	$8,397	$7,590	$33,789	$28,859
Allocation of net income to participating stockholders	-2	-34	-22	-481
Net income available to common stockholders b basic	8,395	7,556	33,767	28,378
Undistributed earnings re-allocated to common stockholders	0	1	0	21
Net income available to common stockholders b diluted	$8,395	$7,557	$33,767	$28,399
Weighted-average shares used in computing basic net income available to comon stockholders	52,267	50,457	51,751	49,410
Dilutive effect of stock options and restricted stock units using treasury-stock method	1,788	1,670	1,664	2,301
Weighted-average shares used in computing diluted net income available to common stockholders	54,055	52,127	53,415	51,711
Basic	$0.16	$0.15	$0.65	$0.57
Diluted	$0.16	$0.14	$0.63	$0.55

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock options outstanding [Member]	'	'	'	'
Weighted-average anti-dilutive securities	1,059	2,927	1,360	1,508
Restricted stock units outstanding [Member]	'	'	'	'
Weighted-average anti-dilutive securities	143	483	255	378
Shares of common stock subject to repurchase [Member]	'	'	'	'
Weighted-average anti-dilutive securities	13	227	34	838

Fair_Value_Measurements_Detail

Fair Value Measurements (Detail) - Financial Assets Measured At Fair Value On A Recurring Basis (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Cash equivalents	'	'
Cash equivalents	$83,859	$47,462
Short-term investments	'	'
Short-term investments	144,993	126,092
Municipal bonds [Member]	'	'
Short-term investments	'	'
Short-term investments	128,573	105,515
U.S. government and agency securities [Member]	'	'
Short-term investments	'	'
Short-term investments	3,001	'
Corporate bonds [Member]	'	'
Short-term investments	'	'
Short-term investments	7,922	6,880
Commercial paper [Member]	'	'
Short-term investments	'	'
Short-term investments	5,497	13,697
Commercial paper [Member]	'	'
Cash equivalents	'	'
Cash equivalents	56,198	19,800
Money market funds [Member]	'	'
Cash equivalents	'	'
Cash equivalents	24,534	14,670
Muncipal bonds [Member]	'	'
Cash equivalents	'	'
Cash equivalents	3,127	3,992
U.S. government and agency securities [Member]	'	'
Cash equivalents	'	'
Cash equivalents	'	9,000
Fair Value, Inputs, Level 1 [Member]	'	'
Cash equivalents	'	'
Cash equivalents	24,534	14,670
Fair Value, Inputs, Level 1 [Member] | Money market funds [Member]	'	'
Cash equivalents	'	'
Cash equivalents	24,534	14,670
Fair Value, Inputs, Level 2 [Member]	'	'
Cash equivalents	'	'
Cash equivalents	59,325	32,792
Short-term investments	'	'
Short-term investments	144,993	126,092
Fair Value, Inputs, Level 2 [Member] | Municipal bonds [Member]	'	'
Short-term investments	'	'
Short-term investments	128,573	105,515
Fair Value, Inputs, Level 2 [Member] | U.S. government and agency securities [Member]	'	'
Short-term investments	'	'
Short-term investments	3,001	'
Fair Value, Inputs, Level 2 [Member] | Corporate bonds [Member]	'	'
Short-term investments	'	'
Short-term investments	7,922	6,880
Fair Value, Inputs, Level 2 [Member] | Commercial paper [Member]	'	'
Short-term investments	'	'
Short-term investments	5,497	13,697
Fair Value, Inputs, Level 2 [Member] | Commercial paper [Member]	'	'
Cash equivalents	'	'
Cash equivalents	56,198	19,800
Fair Value, Inputs, Level 2 [Member] | Muncipal bonds [Member]	'	'
Cash equivalents	'	'
Cash equivalents	3,127	3,992
Fair Value, Inputs, Level 2 [Member] | U.S. government and agency securities [Member]	'	'
Cash equivalents	'	'
Cash equivalents	'	$9,000

Shortterm_Investments_Detail_S

Short-term Investments (Detail) - Summary Of Investments In Available-For-Sale Securities (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Investment Holdings [Line Items]	'	'
Amortized Cost	$144,935	$126,113
Unrealized Gains	58	1
Unrealized Losses	0	-22
Estimated Fair Value	144,993	126,092
Municipal bonds [Member]	'	'
Investment Holdings [Line Items]	'	'
Amortized Cost	128,517	105,536
Unrealized Gains	56	1
Unrealized Losses	0	-22
Estimated Fair Value	128,573	105,515
Corporate bonds [Member]	'	'
Investment Holdings [Line Items]	'	'
Amortized Cost	7,920	6,880
Unrealized Gains	2	0
Unrealized Losses	0	0
Estimated Fair Value	7,922	6,880
Commercial paper [Member]	'	'
Investment Holdings [Line Items]	'	'
Amortized Cost	5,497	13,697
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	5,497	13,697
U.S. government and agency securities [Member]	'	'
Investment Holdings [Line Items]	'	'
Amortized Cost	3,001	'
Unrealized Gains	0	'
Unrealized Losses	0	'
Estimated Fair Value	$3,001	'

Patent_Assets_Net_Detail

Patent Assets, Net (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]	'	'	'	'
Amortization of patent assets	$0.30	$0.40	$1.10	$1.10
Patents [Member]	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'
Amortization of patent assets	$28.20	$21.50	$74.50	$59.20
Minimum [Member] | Patents [Member]	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'
Patent assets, useful life	'	'	'24 months	'
Maximum [Member] | Patents [Member]	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'
Patent assets, useful life	'	'	'60 months	'
Weighted Average [Member] | Patents [Member]	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'
Patent assets, useful life	'	'	'44 months	'

Patent_Assets_Net_Detail_Paten

Patent Assets, Net (Detail) - Patent Assets, Net (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
Patent assets	$6,298	$6,311
Accumulated amortization	-4,210	-3,085
Patent assets, net	210,658	199,314
Patents [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Patent assets	489,176	403,875
Accumulated amortization	-278,518	-204,561
Patent assets, net	210,658	199,314
Additions [Member] | Patents [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Patent assets	86,151	'
Accumulated amortization	-74,479	'
Disposals [Member] | Patents [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Patent assets	-850	'
Accumulated amortization	$522	'

Patent_Assets_Net_Detail_Expec

Patent Assets, Net (Detail) - Expected Future Annual Amortization Expense Of Patent Assets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
2013 (remainder)	$369	'
2014	906	'
2015	625	'
2016	188	'
Total estimated future amortization expense	210,658	199,314
Patents [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
2013 (remainder)	25,715	'
2014	81,411	'
2015	59,348	'
2016	33,553	'
2017	9,263	'
Thereafter	1,368	'
Total estimated future amortization expense	$210,658	$199,314

Property_and_Equipment_Net_Det

Property and Equipment, Net (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Property, Plant and Equipment [Line Items]	'	'	'	'
Depreciation and amortization expense	'	'	$76,767,000	$61,208,000
Internal-use software [Member]	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'
Stock-based compensation capitalized as part of internal-use software	0	100,000	0	300,000
Property and equipment, types [Member]	'	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'	'
Depreciation and amortization expense	$400,000	$400,000	$1,200,000	$900,000

Property_and_Equipment_Net_Det1

Property and Equipment, Net (Detail) - Property And Equipment, Net (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Total property, plant and equipment, gross	$7,611	$4,877
Less: Accumulated depreciation and amortization	-2,821	-1,733
Total property and equipment, net	4,790	3,144
Internal-use software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Internal-use software	3,980	3,078
Computer, equipment and software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Computer, equipment and software	1,074	960
Furniture and fixtures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Furniture and fixtures	675	662
Leasehold improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Leasehold improvements	88	162
Construction-in-progress [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Construction-in-progress	$1,794	$15

Intangible_Assets_Net_Detail

Intangible Assets, Net (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Intangible Assets, Net	'	'	'	'
Amortization of intangible assets	$0.30	$0.40	$1.10	$1.10

Intangible_Assets_Net_Detail_I

Intangible Assets, Net (Detail) - Intangible Assets, Net (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	$6,298	$6,311
Accumulated amortization	-4,210	-3,085
Net carrying amount	2,088	3,226
Trademarks [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	1,890	1,890
Accumulated amortization	-1,047	-637
Net carrying amount	843	1,253
Proprietary data and models [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	1,500	1,500
Accumulated amortization	-544	-264
Net carrying amount	956	1,236
Developed technology [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	728	728
Accumulated amortization	-564	-380
Net carrying amount	164	348
Covenant not to compete [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	480	480
Accumulated amortization	-411	-222
Net carrying amount	69	258
Customer relationships [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	250	250
Accumulated amortization	-194	-132
Net carrying amount	56	118
Other intangible assets [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	1,450	1,450
Accumulated amortization	-1,450	-1,450
Net carrying amount	0	0
Intangible assets in-progress [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Carrying amount	0	13
Accumulated amortization	0	0
Net carrying amount	$0	$13

Intangible_Assets_Net_Detail_E

Intangible Assets, Net (Detail) - Estimated Future Amortization Expenses For Intangible Assets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Estimated Future Amortization Expenses for Intangible Assets [Abstract]	'	'
2013 (remainder)	$369	'
2014	906	'
2015	625	'
2016	188	'
Total estimated future amortization expense	$2,088	$3,226

Accrued_and_Other_Current_Liab2

Accrued and Other Current Liabilities (Detail) - Accrued And Other Current Liabilities (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]	'	'
Accrued liabilities	$7,050	$7,206
Other current liabilities	6,322	1,813
Accrued payroll-related expenses [Member]	'	'
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]	'	'
Accrued liabilities	5,044	6,567
Accrued expenses [Member]	'	'
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]	'	'
Accrued liabilities	2,006	639
Patent and other assets purchased but not paid [Member]	'	'
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]	'	'
Other current liabilities	5,000	1,100
Other current liabilities [Member]	'	'
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]	'	'
Other current liabilities	$1,322	$713

Commitments_and_Contingencies_

Commitments and Contingencies (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Commitments and Contingencies Disclosure	'	'	'	'
Rent expense related to non-cancelable operating leases	$1.10	$0.60	$2.50	$1.80
Aggregate purchase price of patent asset purchase commitments	$7.10	'	$7.10	'

Stockholders_Equity_Detail

Stockholders' Equity (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Intrinsic value of options exercised	$2.60	$3.20	$11.30	$21.90
Stock options [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation expense	1.8	1.8	6.7	5.7
Unrecognized compensation cost related to unvested equity awards	12.4	'	12.4	'
Weighted-average service period of unrecognized compensation cost related to unvested equity awards	'	'	'2 years 2 months	'
Non-employee stock-based compensation expense	0.1	0.1	0.2	0.3
Restricted stock unit [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation expense	2.1	0.6	5.1	1.5
Unrecognized compensation cost related to unvested equity awards	23.3	'	23.3	'
Weighted-average service period of unrecognized compensation cost related to unvested equity awards	'	'	'3 years 1 month	'
Non-employee stock-based compensation expense	$0	$0.10	$0.20	$0.30

Stockholders_Equity_Detail_Act

Stockholders' Equity (Detail) - Activity Under Equity Award Plans And Related Information (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares available for grant	3,023	2,433
Number of shares	5,710	4,334
Weighted-average exercise price (in dollars per share)	$8.85	$9.94
Shares authorized	1,000	'
Options granted	100	'
Options granted	100	'
Options granted (in dollars per share)	$13.26	'
Options exercised	1,060	'
Options exercised (in dollars per share)	$3.92	'
Options forfeited	-416	'
Options forfeited	-416	'
Options forfeited (in dollars per share)	$11.13	'
Restricted stock units granted	2,256	'
Restricted stock units forfeited	-350	'
Weighted-average remaining contractual life in years	'7 years 2 months	'
Aggregate instrinsic value (in dollars)	$35,624	'
Vested and exercisable [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Vested and exercisable (shares)	2,065	'
Vested and exercisable (in dollars per share)	$10.28	'
Vested and exercisable (weighted-average contractual life)	'7 years	'
Vested and exercisable (intrinsic value)	17,080	'
Vested and expected to vest [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Vested and expected to vest (shares)	4,087	'
Vested and expected to vest (in dollars per share)	$9.95	'
Vested and expected to vest (weighted-average contractual life)	'7 years 2 months	'
Vested and expected to vest (intrinsic value)	$33,674	'

Stockholders_Equity_Detail_Res

Stockholders' Equity (Detail) - Restricted Stock Unit Activity (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of shares (in shares)	471
Weighted-average grant date fair value	$17.27
Granted (in shares)	2,256
Forfeited (in shares)	-350
Number of shares (in shares)	2,076
Weighted-average grant date fair value	$12.11
Non-vested units (intrinsic value)	$36,423
Restricted stock units granted [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Granted (in shares)	-2,256
Granted (in dollars per share)	$11.26
Restricted stock units vested [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Vested (in shares)	301
Vested (in dollars per share)	$13.77
Restricted stock units forfeited [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Forfeited (in shares)	350
Forfeited (in dollars per share)	$12.13

Stockholders_Equity_Detail_Wei

Stockholders' Equity (Detail) - Weighted Average Assumptions To Estimate The Fair Value Of Stock Options (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Weighted Average Fair Value Assumptions for Stock-Based Compensation [Abstract]	'	'
Risk-free rate	0.93%	1.11%
Expected volatility	61.00%	61.00%
Expected term (in years)	'6 years 1 month	'6 years
Grant date fair value	$7.39	$9.02

Income_Taxes_Details

Income Taxes (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Taxes [Abstract]	'	'	'	'
Effective tax rate, including the impact of discrete benefit items	37.00%	37.00%	37.00%	37.00%

RelatedParty_Transactions_Deta

Related-Party Transactions (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Related-Party Transactions	'	'	'	'
Subscription fee revenue from related party transactions	$1.30	$0.90	$3.80	$2.50

Segment_Reporting_Detail

Segment Reporting (Detail)	9 Months Ended
	Sep. 30, 2013
Segment Reporting	'
Number of reportable segments	1

Segment_Reporting_Detail_Reven

Segment Reporting (Detail) - Revenue By Location (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Total revenue (in dollars)	$58,554	$47,044	$177,229	$146,131
Total revenue	0.00%	0.00%	0.00%	0.00%
United States [Member]	'	'	'	'
United States (in dollars)	35,842	26,974	108,445	82,066
United States	61.00%	57.00%	61.00%	56.00%
Japan [Member]	'	'	'	'
Other foreign country (in dollars)	9,531	10,226	29,623	29,600
Other foreign country	16.00%	22.00%	17.00%	20.00%
Other [Member]	'	'	'	'
Other foreign country (in dollars)	$13,181	$9,844	$39,161	$34,465
Other foreign country	23.00%	21.00%	22.00%	24.00%

Segment_Reporting_Detail_Longl

Segment Reporting (Detail) - Long-lived Asset Information By Location (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Long-lived Asset Information by Location [Abstract]	'	'
United States	$4,769	$3,116
Japan	21	28
Total long-lived assets	$4,790	$3,144