comScore (SCOR) 10-K18 Feb 142013 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Feb. 14, 2014	Jun. 28, 2013
Entity Information [Line Items]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'SCOR	'	'
Entity Registrant Name	'COMSCORE, INC.	'	'
Entity Central Index Key	'0001158172	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	34,558,475	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Public Float	'	'	$869.20
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:	'	'
Cash and cash equivalents	$67,795	$61,764
Accounts receivable, net of allowances of $1,667 and $1,117, respectively	90,040	68,348
Prepaid expenses and other current assets	10,162	8,877
Deferred tax assets	10,802	9,940
Total current assets	178,799	148,929
Property and equipment, net	37,995	31,418
Other non-current assets	1,123	414
Long-term deferred tax assets	9,244	12,065
Intangible assets, net	32,938	40,759
Goodwill	103,314	102,900
Total assets	363,413	336,485
Current liabilities:	'	'
Accounts payable	3,378	7,229
Accrued expenses	33,472	24,409
Deferred revenues	86,607	80,824
Deferred rent	1,155	807
Deferred tax liabilities	10	17
Capital lease obligations	10,351	8,020
Total current liabilities	134,973	121,306
Deferred rent, long-term	11,747	10,096
Deferred revenue, long-term	2,859	1,715
Deferred tax liabilities, long-term	595	130
Capital lease obligations, long-term	13,330	6,478
Other long-term liabilities	1,107	1,117
Total liabilities	164,611	140,842
Commitments and contingencies	'	'
Stockholdersâ€™ equity:	'	'
Preferred stock, $0.001 par value per share; 5,000,000 shares authorized at December 31, 2013 and December 31, 2012; no shares issued or outstanding at December 31, 2013 and December 31, 2012	0	0
Common stock, $0.001 par value per share; 100,000,000 shares authorized at December 31, 2013 and December 31, 2012; 35,699,508 shares issued and 35,216,071 shares outstanding as of December 31, 2013 and 35,679,430 shares issued and outstanding at December 31, 2012, respectively	36	36
Additional paid-in capital	293,322	274,622
Accumulated other comprehensive income	1,726	1,825
Accumulated deficit	-83,173	-80,840
Treasury stock, at cost, 483,437 and 0 shares as of December 31, 2013 and December 31, 2012, respectively	-13,109	0
Total stockholdersâ€™ equity	198,802	195,643
Total liabilities and stockholdersâ€™ equity	$363,413	$336,485

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement Consolidated Balance Sheets [Abstract]	'	'
Accounts receivable, allowance	$1,667	$1,117
Preferred stock, par value (in dollars per share)	$0.00	$0.00
Preferred stock,shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	35,699,508	35,679,430
Common stock, shares outstanding (in shares)	35,216,071	35,679,430
Treasury Stock, Shares	483,437	0

Consolidated_Statements_of_Ope

Consolidated Statements of Operations and Comprehensive Income (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenues	$286,860		$255,193		$232,392
Cost of revenues (excludes amortization of intangible assets resulting from acquisitions shown below)	89,963	[1]	86,379	[1]	75,103	[1]
Selling and marketing	99,947	[1]	91,849	[1]	78,289	[1]
Research and development	41,025	[1]	33,994	[1]	34,050	[1]
General and administrative	46,449	[1]	38,134	[1]	48,514	[1]
Amortization of intangible assets	7,957		9,289		9,301
Impairment of intangible assets	0		3,349		0
Gain on asset disposition	-214		0		0
Settlement of litigation	-1,360		0		5,175
Total expenses from operations	283,767		262,994		250,432
Income (loss) from operations	3,093		-7,801		-18,040
Interest and other (expense) income, net	-938		-870		-525
Gain (loss) from foreign currency transactions	-62		-744		-410
Gain on sale of marketable securities	0		0		211
Income (loss) before income tax benefit (provision)	2,093		-9,415		-18,764
Benefit (provision) for income taxes	-4,426		-2,374		2,974
Net loss	-2,333		-11,789		-15,790
Net loss available to common stockholders per common share:	'		'		'
Basic (in dollars per share)	($0.07)		($0.35)		($0.49)
Diluted (in dollars per share)	($0.07)		($0.35)		($0.49)
Weighted-average number of shares used in per share calculation - common stock:	'		'		'
Basic (in shares)	34,443,126		33,244,798		32,289,877
Diluted (in shares)	34,443,126		33,244,798		32,289,877
Comprehensive (loss) income:	'		'		'
Net loss	-2,333		-11,789		-15,790
Other comprehensive (loss) income:	'		'		'
Foreign currency cumulative translation adjustment	-99		1,208		-1,110
Unrealized loss on marketable securities, net	0		0		-228
Realized gain on the sale of marketable securities, net	0		0		-211
Total comprehensive loss	($2,432)		($10,581)		($17,339)

[1]	Amortization of stock-based compensation is included in the line items above as follows Cost of revenues $3,346 $2,481 $1,976 Selling and marketing $11,062 $12,283 $8,512 Research and development $3,021 $1,919 $1,988 General and administrative $9,606 $8,213 $8,784

Consolidated_Statements_of_Ope1

Consolidated Statements of Operations and Comprehensive Income (Parenthetical) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cost of revenues [Member]	'	'	'	'	'	'	'	'	'	'	'
Allocated Share-based Compensation Expense	$911	$887	$832	$716	$641	$636	$653	$551	$3,346	$2,481	$1,976
Selling and marketing [Member]	'	'	'	'	'	'	'	'	'	'	'
Allocated Share-based Compensation Expense	2,543	2,487	3,219	2,813	3,986	3,113	3,001	2,183	11,062	12,283	8,512
Research and development [Member]	'	'	'	'	'	'	'	'	'	'	'
Allocated Share-based Compensation Expense	858	947	602	614	525	504	485	405	3,021	1,919	1,988
General and administrative [Member]	'	'	'	'	'	'	'	'	'	'	'
Allocated Share-based Compensation Expense	$3,335	$2,922	$2,493	$856	$2,151	$1,911	$2,200	$1,951	$9,606	$8,213	$8,784

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Accumulated Stockholders' Deficit [Member]	Treasury Stock [Member]
In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Accumulated Stockholders' Deficit [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2010	$165,832	$32	$216,895	$2,166	($53,261)	'
Balance, shares at Dec. 31, 2010	'	31,523,559	'	'	'	'
Net loss	-15,790	'	'	'	-15,790	'
Foreign currency translation adjustment	-1,110	'	'	-1,110	'	'
Unrealized loss on marketable securities	-439	'	'	-439	'	'
Common stock issued in conjunction with acquisitions, shares	'	982,285	'	'	'	'
Common stock issued in conjunction with acquisitions	15,058	1	15,057	'	'	'
Common stock issued in conjunction with litigation settlement, shares	'	974,358	'	'	'	'
Common stock issued in conjuction with litigation settlement	16,175	1	16,174	'	'	'
Exercise of common stock options (in shares)	203,894	203,894	'	'	'	'
Exercise of common stock options	371	0	371	'	'	'
Issuance of restricted stock, shares	'	641,052	'	'	'	'
Issuance of restricted stock	-1	0	-1	'	'	'
Restricted stock cancelled, shares	'	-135,903	'	'	'	'
Restricted stock units vested, shares	'	116,863	'	'	'	'
Common stock received for tax withholding, shares	'	-290,674	'	'	'	'
Common stock received for tax withholding	-7,392	'	-7,392	'	'	'
Excess tax benefits from stock based compensation, net	103	'	103	'	'	'
Amortization of stock based compensation	17,760	'	17,760	'	'	'
Balance at Dec. 31, 2011	190,567	34	258,967	617	-69,051	'
Balance, shares at Dec. 31, 2011	'	34,015,434	'	'	'	'
Net loss	-11,789	'	'	'	-11,789	'
Foreign currency translation adjustment	1,208	'	'	1,208	'	'
Exercise of common stock options (in shares)	367,234	367,234	'	'	'	'
Exercise of common stock options	238	'	238	'	'	'
Exercise of common stock warrants, shares	'	19,895	'	'	'	'
Issuance of restricted stock, shares	'	1,706,900	'	'	'	'
Issuance of restricted stock	0	-2	2	'	'	'
Restricted stock cancelled, shares	'	-233,903	'	'	'	'
Restricted stock units vested, shares	'	168,215	'	'	'	'
Common stock received for tax withholding, shares	'	-364,345	'	'	'	'
Common stock received for tax withholding	-7,362	'	-7,362	'	'	'
Excess tax benefits from stock based compensation, net	-51	'	-51	'	'	'
Amortization of stock based compensation	22,832	'	22,832	'	'	'
Balance at Dec. 31, 2012	195,643	36	274,622	1,825	-80,840	'
Balance, shares at Dec. 31, 2012	'	35,679,430	'	'	'	'
Net loss	-2,333	'	'	'	-2,333	'
Foreign currency translation adjustment	-99	'	'	-99	'	'
Exercise of common stock options (in shares)	52,063	52,063	'	'	'	'
Exercise of common stock options	227	'	227	'	'	'
Issuance of restricted stock, shares	'	484,052	'	'	'	'
Issuance of restricted stock	'	0	0	'	'	'
Restricted stock cancelled, shares	'	-206,360	'	'	'	'
Restricted stock units vested, shares	'	200,651	'	'	'	'
Common stock received for tax withholding, shares	'	-510,328	'	'	'	'
Common stock received for tax withholding	-9,312	'	-9,312	'	'	'
Repurchase of common stock (in shares)	'	-483,437	'	'	'	'
Repurchase of common stock	-13,109	'	'	'	'	-13,109
Amortization of stock based compensation	27,785	'	27,785	'	'	'
Balance at Dec. 31, 2013	$198,802	$36	$293,322	$1,726	($83,173)	($13,109)
Balance, shares at Dec. 31, 2013	'	35,216,071	'	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities	'	'	'
Net loss	($2,333)	($11,789)	($15,790)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'	'
Depreciation	16,777	14,159	13,352
Amortization of intangible assets	7,957	9,289	9,301
Impairment of intangible assets	0	3,349	0
Provision for bad debts	1,248	1,429	220
Stock-based compensation	27,035	24,896	21,260
Amortization of deferred rent	-340	934	-822
Deferred tax (benefit) provision	2,381	896	-4,356
Loss on asset disposal	-267	140	25
Gain on sale of marketable securities	0	0	-211
Settlement of litigation	0	0	5,175
Changes in operating assets and liabilities:	'	'	'
Accounts receivable	-22,560	-4,936	-10,184
Prepaid expenses and other current assets	-712	1,465	-1,520
Accounts payable, accrued expenses, and other liabilities	5,672	-7,840	11,390
Deferred revenues	7,364	11,568	-1,610
Deferred rent	2,352	1,312	520
Net cash provided by operating activities	44,574	44,872	26,750
Investing activities	'	'	'
Proceeds from asset disposition	160	0	0
Acquisitions, net of cash acquired	0	0	-5,162
Sales and maturities of investments	0	0	2,591
Purchase of property and equipment	-4,597	-7,590	-7,235
Net cash used in investing activities	-4,437	-7,590	-9,806
Financing activities	'	'	'
Proceeds from the exercise of common stock options	227	238	371
Repurchase of common stock (withholding taxes)	-9,312	-7,362	-7,392
Repurchase of common stock (treasury shares)	-13,109	0	0
Excess tax benefits from stock based compensation	0	0	177
Principal payments on capital lease obligations	-10,212	-7,012	-5,390
Proceeds from financing arrangements	3,985	4,131	0
Principal payments on financing arrangements	-3,985	-4,280	0
Debt issuance costs	-479	0	-69
Net cash used in financing activities	-32,885	-14,285	-12,303
Effect of exchange rate changes on cash	-1,221	696	-306
Net increase in cash and cash equivalents	6,031	23,693	4,335
Cash and cash equivalents at beginning of year	61,764	38,071	33,736
Cash and cash equivalents at end of year	67,795	61,764	38,071
Supplemental cash flow disclosures	'	'	'
Interest paid	756	775	701
Net income tax paid	1,332	997	2,027
Supplemental noncash investing and financing activities	'	'	'
Capital lease obligations incurred	19,381	8,544	5,411
Leasehold improvements acquired through lease incentives	2,272	1,282	331
Accrued capital expenditures	1,451	930	0
Patents acquired through issuance of common stock	$0	$0	$11,000
Stock issued in connection with business combination	0	0	15,000

Organization

Organization	12 Months Ended
Organization	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization	'
	Organization
	comScore, Inc. (the “Company”), a Delaware corporation incorporated in August 1999, provides digital media analytics that enables its customers to make well-informed, data-driven decisions to effectively manage their business, build successful digital strategies and tactics, and optimize their marketing and advertising investments. The Company is a technology-driven company that measures what people do as they navigate the digital world across multiple technology platforms including personal computers, smartphones, tablets, televisions and interact with digital media, including Web sites, apps, video programming and advertising. The Company aspires to measure all digital interactions across all major digital platforms, at scale, on a global basis.
	The Company's products and services provide its customers with deep and actionable insight into consumer behavior including objective, detailed information about consumer usage of digital content and advertising coupled with information on consumer demographic characteristics, attitudes, lifestyles and offline behavior. The Company is skilled in combining proprietary Company data with its clients’ own data, as well as data from partners, to provide uniquely valuable digital media analytics. We deliver on-demand and real-time products and services through a scalable Software-as-Service delivery model which supports both Company branded products and also partner products integrating the Company's data and services.

Summary_of_Significant_Account

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation and Consolidation

The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany transactions and accounts have been eliminated upon consolidation. The Company consolidates investments where it has a controlling financial interest. The usual condition for controlling financial interest is ownership of a majority of the voting interest and, therefore, as a general rule, ownership, directly or indirectly, of more than 50% of the outstanding voting shares is a condition indicating consolidation. For investments in variable interest entities, the Company would consolidate when it is determined to be the primary beneficiary of a variable interest entity. The Company does not have any variable interest entities.

Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the reported amounts of revenue and expense during the reporting periods. Significant estimates and assumptions are inherent in the analysis and the measurement of deferred tax assets, the identification and quantification of income tax liabilities due to uncertain tax positions, valuation of marketable securities, recoverability of intangible assets, other long-lived assets and goodwill, accruals related to outstanding litigation, the collectability of accounts receivable and the determination of the allowance for doubtful accounts. The Company bases its estimates on historical experience and assumptions that it believes are reasonable. Actual results could differ from those estimates.

Fair Value Measurements

The Company evaluates the fair value of certain assets and liabilities using the fair value hierarchy. Fair value is an exit price representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, the Company applies the three-tier value hierarchy which prioritizes the inputs used in measuring fair value as follows:

Level 1 — observable inputs such as quoted prices in active markets;

Level 2 — inputs other than the quoted prices in active markets that are observable either directly or indirectly;

Level 3 — unobservable inputs of which there is little or no market data, which require the Company to develop its own assumptions.

The Company does not currently have any assets or liabilities that are measured at fair value on a recurring basis. However, cash equivalents, accounts receivable, prepaid expenses and other assets, accounts payable, accrued expenses, deferred revenue, deferred rent and capital lease obligations reported in the consolidated balance sheets equal or approximate their respective fair values.

Assets and liabilities that are measured at fair value on a non-recurring basis include fixed assets, intangible assets and goodwill. The Company recognizes these items at fair value when they are considered to be impaired. During the first quarter of 2013, certain intangible assets acquired were measured at fair value using significant unobservable inputs (Level 3) as described in Note 4. During the year ended December 31, 2013, the Company recorded these assets as follows:

Fair Value Measurements Using

31-Mar-13

Quoted

Significant

Total Gains (Losses)

Prices in

Other

Unobservable

Active

Observable

Inputs

Markets for

Inputs

Identical

Assets

(Level 1)

(Level 2)

(Level 3)

Description

(In thousands)

Long-lived assets held and used

1,182

—

During the second quarter of 2012, certain intangible assets were measured at fair value using significant unobservable inputs (Level 3) as described in Note 5. During the year ended December 31, 2012, the Company recorded an impairment charge of $3.3 million pertaining to these assets as follows:

Fair Value Measurements Using

30-Jun-12

Quoted

Significant

Total Gains (Losses)

Prices in

Other

Unobservable

Active

Observable

Inputs

Markets for

Inputs

Identical

Assets

(Level 1)

(Level 2)

(Level 3)

Description

(In thousands)

Long-lived assets held and used

2,500

(3,349

)

Cash and Cash Equivalents

Cash and cash equivalents consist of highly liquid investments with an original maturity of three months or less at the time of purchase. Cash and cash equivalents consist primarily of bank deposit accounts.

Interest income on investments was $0.2 million, $0.1 million and $0.1 million for the years ended December 31, 2013, 2012 and 2011, respectively.

Accounts Receivable

Accounts receivable are recorded at the invoiced amount and are non-interest bearing. The Company generally grants uncollateralized credit terms to its customers and maintains an allowance for doubtful accounts to reserve for potentially uncollectible receivables. Allowances are based on management’s judgment, which considers historical experience and specific knowledge of accounts where collectability may not be probable. The Company makes provisions based on historical bad debt experience, a specific review of all significant outstanding invoices and an assessment of general economic conditions. If the financial condition of a customer deteriorates, resulting in an impairment of its ability to make payments, additional allowances may be required. Included within accounts receivables are unbilled accounts receivable, which relate to situations in which the Company has recognized revenue prior to invoicing a customer, but for which we have the legal right to invoice the customer. Unbilled accounts receivables are invoiced in the following period.

The following is a summary of activities in the allowance for doubtful accounts for the fiscal years indicated:

Year Ended December 31,

2013

2012

2011

(In thousands)

Allowance for Doubtful Accounts

Beginning Balance

(1,117

)

(903

)

(725

)

Additions

(1,248

)

(1,429

)

(220

)

Reductions, (recoveries) and write-offs

698

1,215

Ending Balance

(1,667

)

(1,117

)

(903

)

Property and Equipment

Property and equipment is stated at cost, net of accumulated depreciation. Property and equipment is depreciated on a straight-line basis over the estimated useful lives of the assets, ranging from three to five years. Assets under capital leases are recorded at their net present value at the inception of the lease and are included in the appropriate asset category. Assets under capital leases and leasehold improvements are amortized over the shorter of the related lease terms or their useful lives. Replacements and major improvements are capitalized; maintenance and repairs are charged to expense as incurred. Amortization of assets under capital leases is included within the expense category in which the asset is deployed.

Business Combinations

The Company recognizes all of the assets acquired, liabilities assumed, contractual contingencies, and contingent consideration at their fair value on the acquisition date. Acquisition-related costs are recognized separately from the acquisition and expensed as incurred. Generally, restructuring costs incurred in periods subsequent to the acquisition date are expensed when incurred. Subsequent changes to the purchase price (i.e., working capital adjustments) or other fair value adjustments determined during the measurement period are recorded as an adjustment to goodwill. All subsequent changes to an income tax valuation allowance or uncertain tax position that relate to the acquired company and existed at the acquisition date that occur both within the measurement period and as a result of facts and circumstances that existed at the acquisition date are recognized as an adjustment to goodwill. All other changes in income tax valuation allowances are recognized as a reduction or increase to income tax expense or as a direct adjustment to additional paid-in capital as required.

Goodwill and Intangible Assets

Goodwill represents the excess of the purchase price over the fair value of identifiable assets acquired and liabilities assumed when a business is acquired. The allocation of the purchase price to intangible assets and goodwill involves the extensive use of management’s estimates and assumptions, and the result of the allocation process can have a significant impact on future operating results. The allocation of the purchase price to intangible assets is done at fair value. The Company estimates the fair value of identifiable intangible assets acquired using various valuation methods, including the excess earnings and relief from royalty methods.

Intangible assets with finite lives are amortized over their useful lives while goodwill is not amortized but is evaluated for potential impairment at least annually by comparing the fair value of a reporting unit to its carrying value including goodwill recorded by the reporting unit. If the carrying value exceeds the fair value, impairment is measured by comparing the implied fair value of the goodwill to its carrying value, and any impairment determined is recorded in the current period. The Company has one reporting unit. Accordingly, on an annual basis the Company performs the impairment assessment for goodwill at the enterprise level. The Company completed its annual impairment analysis as of October 1st for each of the years ended December 31, 2013, 2012 and 2011 and determined that there was no impairment of goodwill.

Intangible assets with finite lives are amortized using the straight-line method over the following useful lives:

Useful

Lives

(Years)

Acquired methodologies/technology

3 to 10

Customer relationships

3 to 12

Panel

Intellectual property

7 to 13

Trade names

2 to 10

Impairment of Long-Lived Assets

The Company’s long-lived assets primarily consist of property and equipment and intangible assets. The Company evaluates the recoverability of its long-lived assets for impairment whenever events or changes in circumstances indicate the carrying value of such assets may not be recoverable. If an indication of impairment is present, the Company compares the estimated undiscounted future cash flows to be generated by the asset to its carrying amount. Recoverability measurement and estimation of undiscounted cash flows are grouped at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities. If the undiscounted future cash flows are less than the carrying amount of the asset group, the Company records an impairment loss equal to the excess of the asset group’s carrying amount over its fair value. The fair value is determined based on valuation techniques such as a comparison to fair values of similar assets or using a discounted cash flow analysis. Although the Company believes that the carrying values of its long-lived assets are appropriately stated, changes in strategy or market conditions or significant technological developments could significantly impact these judgments and require adjustments to recorded asset balances. During the year ended December 31, 2012, the Company recorded an impairment charge of $3.3 million related to certain intangible assets as described in Note 6. There were no impairment charges recognized during the years ended December 31, 2013 or 2011.

Lease Accounting

The Company leases its facilities and accounts for those leases as operating leases. For facility leases that contain rent escalations or rent concession provisions, the Company records the total rent payable during the lease term on a straight-line basis over the term of the lease. The Company records the difference between the rent paid and the straight-line rent as a deferred rent liability. Leasehold improvements funded by landlord incentives or allowances are recorded as leasehold improvement assets and a deferred rent liability which is amortized as a reduction of rent expense over the term of the lease.

The Company records capital leases as an asset and an obligation at an amount equal to the present value of the minimum lease payments as determined at the beginning of the lease term. Amortization of capitalized leased assets is computed on a straight-line basis over the term of the lease and is included in depreciation and amortization expense.

Foreign Currency

The functional currency of the Company’s foreign subsidiaries is the local currency. All assets and liabilities are translated at the current exchange rate as of the end of the period, and revenues and expenses are translated at average exchange rates in effect during the period. The gain or loss resulting from the process of translating foreign currency financial statements into U.S. dollars is reflected as foreign currency cumulative translation adjustment and reported as a component of Accumulated other comprehensive income.

The Company incurred foreign currency transaction losses of $0.1 million, $0.7 million, and $0.4 million for the years ended December 31, 2013, 2012 and 2011, respectively. The losses are the result of transactions denominated in currencies other than the functional currency of the Company’s foreign subsidiaries.

Operating Segment Information

The Company has concluded that it has one operating segment based on the fact that its Chief Executive Officer, who is also its chief operating decision maker, continues to evaluate performance and make operating decisions based on consolidated financial data. Additionally, there are no managers who are held accountable by the chief operating decision maker, or anyone else, for an operating measure of profit or loss for any operating unit below the consolidated unit level.

Revenue Recognition

The Company recognizes revenues when the following fundamental criteria are met: (i) persuasive evidence of an arrangement exists, (ii) delivery has occurred or the services have been rendered, (iii) the fee is fixed or determinable, and (iv) collection of the resulting receivable is reasonably assured.

The Company generates revenues by providing access to the Company’s online database or delivering information obtained from the database, usually in the form of periodic reports. Revenues are typically recognized on a straight-line basis over the period in which access to data or reports is provided, which generally ranges from three to twenty-four months. Sales taxes remitted to government authorities are recorded on a net basis.

Revenues are also generated through survey services under contracts ranging in term from two months to 1 year. Survey services consist of survey and questionnaire design with subsequent data collection, analysis and reporting. At the outset of an arrangement, total arrangement consideration is allocated between the development of the survey questionnaire and subsequent data collection, analysis and reporting services based on relative selling price. Revenue allocated to the survey questionnaire is recognized when it is delivered and revenue allocated to the data collection, analysis and reporting services is recognized on a straight-line basis over the estimated data collection period once the survey or questionnaire design has been delivered. Any change in the estimated data collection period results in an adjustment to revenues recognized in future periods.

Certain of the Company’s arrangements contain multiple elements, consisting of the various services the Company offers. Multiple element arrangements typically consist of either subscriptions to multiple online product solutions or a subscription to the Company’s online database combined with customized services. The Company accounts for these arrangements in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2009-13, Multiple Deliverable Revenue Arrangements, which requires the Company to allocate arrangement consideration at the inception of an arrangement to all deliverables, if they represent a separate unit of accounting, based on their relative selling prices. The guidance establishes a hierarchy to determine the selling price to be used for allocating arrangement consideration to deliverables: (i) vendor-specific objective evidence of fair value (“VSOE”), (ii) third-party evidence of selling price (“TPE”) if VSOE is not available, or (iii) an estimated selling price (“ESP”) if neither VSOE nor TPE are available. VSOE generally exists only when the Company sells the deliverable separately and is the price actually charged by the Company for that deliverable on a stand-alone basis. ESP reflects the Company’s estimate of what the selling price of a deliverable would be if it was sold regularly on a stand-alone basis.

The Company has concluded it does not have VSOE, for these types of arrangements, and TPE is generally not available because the Company’s service offerings are highly differentiated and the Company is unable to obtain reliable information on the products and pricing practices of the Company’s competitors. As such, ESP is used to allocate the total arrangement consideration at the arrangement inception based on each element’s relative selling price.

The Company’s process for determining ESP involves management’s judgments based on multiple factors that may vary depending upon the unique facts and circumstances related to each product suite and deliverable. The Company determines ESP by considering several external and internal factors including, but not limited to, current pricing practices, pricing concentrations (such as industry, channel, customer class or geography), internal costs and market penetration of a product or service. The total arrangement consideration is allocated to each of the elements based on the relative selling price. If the ESP is determined as a range of selling prices, the mid-point of the range is used in the relative-selling-price method. Once the total arrangement consideration has been allocated to each deliverable based on the relative allocation of the arrangement fee, the Company commences revenue recognition for each deliverable on a stand-alone basis as the data or service is delivered. ESP will be analyzed on an annual basis or more frequently if management deems it likely that changes in the estimated selling prices have occurred.

Generally, contracts are non-refundable and non-cancelable. In the event a portion of a contract is refundable, revenue recognition is delayed until the refund provisions lapse. A limited number of customers have the right to cancel their contracts by providing a written notice of cancellation. In the event that a customer cancels its contract, the customer is not entitled to a refund for prior services, and will be charged for costs incurred plus services performed up to the cancellation date.

Advance payments are recorded as deferred revenues until services are delivered or obligations are met and revenue can be recognized. Deferred revenues represent the excess of amounts invoiced over amounts recognized as revenues.

Multiple contracts with a single counterparty that are negotiated simultaneously and are considered contemporaneous are accounted for as one arrangement. If there are multiple contracts with one counterparty that are deemed independent of one another, they are accounted for as separate arrangements.

On July 1, 2010, the Company completed its acquisition of Nexius, resulting in additional revenue sources, including software licenses, professional services (including software customization, implementation, training and consulting services), and maintenance and technical support contracts. The Company’s arrangements generally contain multiple elements, consisting of the various service offerings. The Company recognizes software license arrangements that include significant modification and customization of the software in accordance with FASB Accounting Standards Codification (“ASC”) 985-605, Software Recognition, and ASC 605-35, Revenue Recognition-Construction-Type and Certain Production-Type Contracts, using either the percentage-of-completion or the completed-contract method. Under the percentage-of-completion method, the Company uses the input method to measure progress, which is based on the ratio of costs incurred to date to total estimated costs at completion. The percentage-of-completion method is used when reliable estimates of progress and completion under the contract can be made. Under the completed-contract method, billings and costs (to the extent they are recoverable) are accumulated on the balance sheet, but no profit or income is recorded before user acceptance of the software license. The completed-contract method is used when reliable estimates cannot be made or other terms under the contract require it. To the extent estimated costs are expected to exceed revenue, the Company accrues for costs immediately. The Company considers a contract to be completed when all performance obligations have been delivered and the customer provides formal acceptance in the form of a "User Acceptance Testing" certificate and the Company applies this policy on a consistent basis. Prior to March 31, 2011, the Company had not established VSOE of fair value for the multiple deliverables and therefore accounted for all elements in these arrangements as a single unit of accounting, recognizing the entire arrangement fee as revenue on a straight line basis over the service period of the last delivered element. During the quarter ended June 30, 2011 the Company established VSOE of fair value for post contract support (“PCS”) services for a group of certain Nexius customers. The establishment of VSOE of fair value followed an alignment of the Company’s pricing practices for these services. As a result of establishing VSOE, the Company, for the year ended December 31, 2011, recorded revenue and related costs of revenue of $2.4 million and $1.4 million, respectively, of which $0.9 million and $0.3 million, respectively, had been previously deferred. For the remainder of the Nexius customers, we currently do not have VSOE for the multiple deliverables and account for all elements in these arrangements as a single unit of accounting, recognizing the entire arrangement fee as revenue over the service period of the last delivered element.

The Company accounts for nonmonetary transactions under ASC 845, Nonmonetary Transactions. Nonmonetary transactions with commercial substance are recorded at the estimated fair value of assets surrendered including cash, if cash is less than 25% of the fair value of the overall exchange, unless the fair value of the assets received is more clearly evident, in which case the fair value of the asset received is used to estimate fair value for the exchange.

In the fourth quarter of 2013, the Company entered into an agreement to exchange certain data assets with a corporation. A member of the Company’s Board of Directors also serves as a member of the Board of Directors of that corporation and therefore, we have considered the corporation to be a related party. The transaction was considered to have commercial substance under the guidance in ASC 845 and the Company estimated the fair value of the services delivered based on similar monetary transactions with third parties. No cash was exchanged in this transaction. The Company also considered the guidance in ASC 850, Related Party Disclosures.

During the year ended December 31, 2013 the Company recognized $3.2 million in revenue related to nonmonetary transactions of which $1.8 million is attributable to this related party transaction. Due to timing differences in the delivery and receipt of the respective nonmonetary assets exchanged, the expense recognized in each period is different from the amount of revenue recognized. As a result, during the year ended December 31, 2013, the Company recognized $1.8 million in expense related to nonmonetary transactions, though no expense was recognized for this related party transaction since data assets have not yet been received.

Costs of Revenues

Cost of revenues consists primarily of expenses related to the operating network infrastructure and the recruitment, maintenance and support of consumer panels. Expenses associated with these areas include the salaries, stock-based compensation, benefits and related expenses of network operations, survey operations, custom analytics and technical support departments, and are expensed as they are incurred. Cost of revenues consists primarily of expenses related to the operating network infrastructure and the recruitment, maintenance and support of consumer panels. Expenses associated with these areas include the salaries, stock-based compensation, benefits and related expenses of network operations, survey operations, custom analytics and technical support departments. Cost of revenues also includes data collection costs for the products and operational costs associated with the Company’s data centers, including depreciation expense associated with computer equipment that supports its panel and systems, and allocated overhead, which is comprised of rent and depreciation expense generated by general purpose equipment and software.

Deferred contract costs represents incremental direct costs paid to a third party and the internal costs of employees directly related to the delivery of an item that cannot be accounted for separately from the undelivered items for certain of the Company’s significantly customized software sales or other long-term in nature projects. These costs are recognized as cost of revenues ratably over the same period that deferred revenue is recognized as revenues. The Company analyzes the recoverability of these costs each reporting period.

Selling and Marketing

Selling and marketing expenses consist primarily of salaries, stock-based compensation, benefits, commissions and bonuses paid to the direct sales force and industry analysts, as well as costs related to online and offline advertising, product management, seminars, promotional materials, public relations, other sales and marketing programs, and allocated overhead, including rent and other facilities related costs, and depreciation. All selling and marketing costs are expensed as they are incurred.

Research and Development

Research and development expenses include new product development costs, consisting primarily of salaries, stock-based compensation, benefits and related costs for personnel associated with research and development activities, and allocated overhead, including rent and other facilities related costs, and depreciation.

General and Administrative

General and administrative expenses consist primarily of salaries, stock-based compensation, benefits and related expenses for executive management, finance, accounting, human capital, legal, information technology and other administrative functions, as well as professional fees, overhead, including allocated rent and other facilities related costs, and depreciation and expenses incurred for other general corporate purposes.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash equivalents and accounts receivable. The Company maintains cash deposits with financial institutions that at times exceed applicable insurance limits. The Company reduces this risk by maintaining such deposits with high quality financial institutions that management believes are creditworthy. With respect to accounts receivable, credit risk is mitigated by the Company’s ongoing credit evaluation of its customers’ financial condition.

For the years ended December 31, 2013, 2012 and 2011, one customer, Microsoft Corporation, accounted for approximately 7%, 8% and 10%, respectively, of total revenues. As of December 31, 2013 and 2012, no one customer accounted for more than 10% of accounts receivable.

Advertising Costs

All advertising costs are expensed as incurred. Advertising expense includes costs associated with direct marketing but does not include the cost of attendance at events or trade shows. Advertising expense, which is included in sales and marketing expense, totaled $0.2 million, $0.1 million and $0.1 million for the years ended December 31, 2013, 2012 and 2011, respectively.

Stock-Based Compensation

The Company estimates the fair value of share-based awards on the date of grant. The fair value of stock options with only service conditions is determined using the Black-Scholes option-pricing model. The fair value of market-based stock options and restricted stock units is determined using a Monte Carlo simulation embedded in a lattice model. The fair value of restricted stock awards is based on the closing price of the Company’s common stock on the date of grant. The determination of the fair value of the Company’s stock option awards and restricted stock awards is based on a variety of factors including, but not limited to, the Company’s common stock price, expected stock price volatility over the expected life of awards, and actual and projected exercise behavior. Additionally, the Company has estimated forfeitures for share-based awards at the dates of grant based on historical experience, adjusted for future expectation. The forfeiture estimate is revised as necessary if actual forfeitures differ from these estimates.

The Company issues restricted stock awards where restrictions lapse upon the passage of time (service vesting), achieving performance targets, or some combination of these restrictions. For those restricted stock awards with only service conditions, the Company recognizes compensation cost on a straight-line basis over the explicit service period. For awards with both performance and service conditions, the Company starts recognizing compensation cost over the remaining service period, when it is probable the performance condition will be met. For stock awards that contain performance or market vesting conditions, the Company excludes these awards from diluted earnings per share computations until the contingency is met as of the end of that reporting period.

Income Taxes

Income taxes are accounted for using the asset and liability method. Deferred income taxes are provided for temporary differences in recognizing certain income, expense and credit items for financial reporting purposes and tax reporting purposes. Such deferred income taxes primarily relate to the difference between the tax bases of assets and liabilities and their financial reporting amounts. Deferred tax assets and liabilities are measured by applying enacted statutory tax rates applicable to the future years in which deferred tax assets or liabilities are expected to be settled or realized.

The Company records a valuation allowance when it determines, based on available positive and negative evidence, that it is more-likely-than-not that some portion or all of its deferred tax assets will not be realized. The Company determines the realizability of its deferred tax assets primarily based on the reversal of existing taxable temporary differences and projections of future taxable income (exclusive of reversing temporary differences and carryforwards). In evaluating such projections, the Company considers its history of profitability, the competitive environment, the overall outlook for the online marketing industry and general economic conditions. In addition, the Company considers the timeframe over which it would take to utilize the deferred tax assets prior to their expiration.

For certain tax positions, the Company uses a more-likely-than-not threshold based on the technical merits of the tax position taken. Tax positions that meet the more-likely-than-not recognition threshold are measured at the largest amount of tax benefits determined on a cumulative probability basis, which are more-likely-than-not to be realized upon ultimate settlement in the financial statements. The Company’s policy is to recognize interest and penalties related to income tax matters in income tax expense.

Earnings Per Share

Basic net (loss) income per common share excludes dilution for potential common stock issuances and is computed by dividing net (loss) income by the weighted-average number of common shares outstanding for the period. Diluted net (loss) income per common share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. Diluted earnings per share assumes the exercise of stock options and warrants using the treasury stock method.

The following table provides a reconciliation of the numerators and denominators used in computing basic and diluted net (loss) income per common share:

Year Ended December 31,

2013

2012

2011

(In thousands, except share data)

Calculation of basic and diluted net income per share:

Net (loss) income

(2,333

)

(11,789

)

(15,790

)

Net (loss) income per common share:

Basic

(0.07

)

(0.35

)

(0.49

)

Diluted

(0.07

)

(0.35

)

(0.49

)

Weighted-average shares outstanding-common stock, basic

34,443,126

33,244,798

32,289,877

Dilutive effect of

Options to purchase common stock

—

Unvested restricted stock units

—

Warrants to purchase common stock

—

Weighted-average shares outstanding-common stock, diluted

34,443,126

33,244,798

32,289,877

The Company uses the two-class method for earning allocations between the Company's restricted stock awards, as they are a participating security, and the Company's common stock. The dilutive effect of stock options and restricted stock of 688,659, 1,547,077 and 627,147 were not included in the computation of diluted net (loss) income per common share for the years ended December 31, 2013, 2012 and 2011, respectively, as their effect would be anti-dilutive.

Recent Pronouncements

In July 2013, FASB issued Accounting Standards Update 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Exists. This update requires unrecognized tax benefits to be offset against a deferred tax asset for a net operating loss carryforward, similar tax loss or tax credit carryforward in certain situations. This update was created due to the diversity in practice in presentation of unrecognized tax benefits in those instances. Some entities present unrecognized tax benefits as a liability unless the unrecognized tax benefit is directly associated with a tax position taken in a tax year that results in, or resulted in, the recognition of a net operating loss or tax credit carryforward for that year and the net operating loss or tax credit carryforward for that year has not been utilized. Other entities present unrecognized tax benefits as a reduction of a deferred tax asset for a net operating loss or tax credit carryforward in certain circumstances. The objective of this update is to eliminate this diversity in practice. The amendments in this update should be applied prospectively for reporting periods beginning after December 15, 2013. The Company does not believe that this standard will have a material impact on the Company’s financial statements.

Business_Combinations

Business Combinations	12 Months Ended
Business Combinations	Dec. 31, 2013
Business Combinations [Abstract]	'
Business Combinations	'
	Business Combinations
	The Company uses its best estimates and assumptions as a part of the purchase price allocation process to accurately value assets acquired and liabilities assumed at the business combination date, its estimates and assumptions are inherently uncertain and subject to refinement. As a result, during the preliminary purchase price allocation period, which may be up to one year from the business combination date, the Company records adjustments to the assets acquired and liabilities assumed, with the corresponding offset to goodwill. The Company records adjustments to assets acquired or liabilities assumed subsequent to the purchase price allocation period in its operating results in the period in which the adjustments were determined. None of the goodwill is deductible for tax purposes.
	For the years ended December 31, 2013 and December 31, 2012 there were no transaction related costs. For the year ended December 31, 2011, there were $0.7 million of transaction related costs included in general and administrative expenses.
	AdXpose, Inc.
	On August 11, 2011, the Company completed its acquisition of AdXpose, Inc. (“AdXpose”). AdXpose provides advertisers and publishers with greater transparency in the quality, safety, and performance of their digital advertising campaigns by allowing them to verify and optimize billions of campaign data points captured in real-time. The aggregate amount of the consideration paid by the Company upon the closing of the transaction was $19.4 million. Of the $19.4 million, $4.4 million was paid in cash and an aggregate of 982,285 shares of the Company’s common stock with a fair value of $15.0 million on the acquisition date was issued to the AdXpose stockholders.
	The acquisition of AdXpose resulted in goodwill of approximately $16.0 million, none of which is deductible for tax purposes. This amount represents the residual amount of the total purchase price after allocation to net assets and identifiable intangible assets acquired. The amount recorded as goodwill is consistent with the Company’s intentions for the acquisition of AdXpose. The Company acquired AdXpose to enhance its capabilities in the marketplace for highly effective advertising campaign measurement.
	Definite-lived intangible assets of $0.9 million consist of the value assigned to AdXpose’s developed technology, customer relationships, and trade name of $0.7 million, $0.1 million and $0.1 million, respectively. These intangible assets have been assigned useful lives of five, three and 1.5 years, respectively.
	The Company has included the financial results of AdXpose in its consolidated financial statements beginning August 11, 2011. Included in revenue for the period from August 11, 2011 to December 31, 2011 was $1.5 million related to AdXpose.

Asset_Disposition

Asset Disposition	12 Months Ended
	Dec. 31, 2013
Asset Disposition Table [Abstract]	'
Asset Disposition	'
	Asset Disposition

	On March 18, 2013, the Company and its wholly-owned subsidiary RSC The Quality Measurement Company (also known as ARSgroup), sold certain assets related to its ARS Non-Health Copy-Testing and Equity Tracking business to MSW.ARS LLC, a Delaware limited liability company ("Buyer").
	In connection with the disposition, the Company received total proceeds of $1.0 million in cash. In addition, the Company entered into a license agreement in which it will retain the right to use the necessary intellectual property to continue to provide the ARS Copy-Testing and Equity Tracking services to its Health related customers and recorded an intangible asset of $1.2 million based on the estimated fair value of the licensed intellectual property. In determining the fair value of the intangible asset, the Company prepared a discounted cash flow (“DCF”) analysis. In preparing the DCF analysis, the Company used a combination of income approaches including the relief from royalty approach and the excess earnings approach. Determining fair value requires the exercise of significant judgment, including judgments about appropriate discount rates, terminal growth rates, royalty rates and the amount and timing of expected future cash flows. The cash flows employed in the DCF analysis were based on the Company’s most recent budgets, forecasts and business plans as well as growth rate assumptions for years beyond the current business plan period. Significant assumptions used include a discount rate of 18.5%, which is based on an assessment of the risk inherent in the future revenue streams and cash flows associated with the health related customers of ARS, as well as a royalty rate of 3.0%, which is based on an analysis of royalty rates in similar, market transactions. This intangible asset will be amortized on a straight-line basis over its estimated useful life of 3 years beginning April 1, 2013. The assets disposed of included computer equipment, furniture and fixtures, intellectual property and the intangible assets associated with the ARSgroup. Due to the fact that the Company will continue to provide the ARS Copy-Testing and Equity Tracking services to its Health related customers and has therefore not eliminated the operations and cash flows of the ARSgroup, management has concluded that the disposition does not qualify for presentation as discontinued operations.
	As a result of the disposition, during the three months ended March 31, 2013, the Company recorded a gain on the Disposition of $0.2 million, determined as follows (in thousands):


	Cash proceeds received at closing, net	$	160

	Proceeds receivable (placed in escrow)	750

	Fair value of licensed intellectual property	1,182

		2,092

	Carrying value of assets disposed	(1,436		)
	Goodwill allocated to disposition	(289		)
	Fair value of accelerated equity awards	(157		)
	Gain on disposition	$	210

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property and Equipment	'
	Property and Equipment
	Property and equipment, including equipment under capital lease obligations, consists of the following:



		December 31,
		2013			2012
		(In thousands)
	Computer equipment	$	60,673		$	39,570

	Computer software	5,764			10,773

	Office equipment and furniture	5,156			4,570

	Automobiles	1,644			1,329

	Leasehold improvements	15,785			14,119

	Total, including capital leases of $43,776 and $25,786, respectively	89,022			70,361

	Less: accumulated depreciation and amortization, including capital leases of $22,430 and $12,668, respectively	(51,027		)	(38,943		)
		$	37,995		$	31,418

	During the years ended December 31, 2013 and 2012, the Company capitalized $2.3 million and $1.3 million, respectively, of leasehold improvements, furniture and fixtures and office equipment associated with landlord allowances received in connection with its Reston, New York and London office leases (see Note 8).
	For the years ended December 31, 2013, 2012 and 2011, total depreciation expense was $16.8 million, $14.2 million and $13.4 million, respectively.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
Goodwill and Intangible Assets	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets
	The change in the carrying value of goodwill for the year ended December 31, 2013 is as follows (in thousands):



	Balance as of December 31, 2012	$	102,900
	Balance as of December 31, 2012	$	102,900
	Goodwill allocated to ARS disposition	(289		)
	Translation adjustments	703
	Translation adjustments	703
	Balance as of December 31, 2013	$	103,314
	Balance as of December 31, 2013	$	103,314
	During the three months ended June 30, 2012, the Company noted a significant decline in revenues from ARSgroup (“ARS”), which the Company acquired in February 2010. As a result, the Company performed an impairment test of the long-lived assets of ARS. The long-lived assets of ARS consist of customer relationships and acquired methodologies and technology. The first step in testing the long-lived assets of ARS for impairment was to compare the sum of the undiscounted cash flows expected to result from the use and eventual disposition of ARS to the carrying value of ARS’s long-lived assets. Based on this analysis, the Company determined as of June 30, 2012 that the sum of the expected undiscounted cash flows to be generated from ARS was less than the carrying value of the ARS intangible assets. As such, the Company concluded that the ARS intangible assets were impaired as of June 30, 2012. To measure the amount of the impairment, the Company then estimated the fair value of the intangible assets as of June 30, 2012. In determining the fair value of the intangible assets, the Company prepared a discounted cash flow (“DCF”) analysis for each intangible asset. In preparing the DCF analysis, the Company used a combination of income approaches including the relief from royalty approach and the excess earnings approach. Determining fair value requires the exercise of significant judgment, including judgments about appropriate discount rates, terminal growth rates, royalty rates and the amount and timing of expected future cash flows. The cash flows employed in the DCF analysis were based on the Company’s most recent budgets, forecasts and business plans as well as growth rate assumptions for years beyond the current business plan period. Significant assumptions used include a discount rate of 18.5%, which is based on an assessment of the risk inherent in the future revenue streams and cash flows of ARS, as well as a royalty rate of 3.0%, which is based on an analysis of royalty rates in similar, market transactions. Based on the DCF analysis, the Company estimated the fair value of the intangible assets of ARS to be $2.5 million as of June 30, 2012, which resulted in an impairment charge of $3.3 million during the year ended December 31, 2012. The impairment charge had a negative impact on net loss of $3.3 million and an impact on earnings per share of $0.10 per share during the year ended December 31, 2012. In addition, these intangible assets are being amortized over a remaining estimated useful life of eighteen months, beginning July 1, 2012. Other than the ARS impairment, there were no events or circumstances to indicate that the carrying amount of goodwill or intangible assets were not recoverable. Accordingly, no additional impairment charges have been recorded.
	Certain of the Company’s intangible assets are recorded in euros, British Pounds and the local currencies of our South American subsidiaries, and therefore, the gross carrying amount and accumulated amortization are subject to foreign currency translation adjustments. As discussed in Note 9, the Company acquired $11.0 million in patents during 2011. The carrying values of the Company’s amortized acquired intangible assets are as follows (in thousands):



			31-Dec-13							31-Dec-12
			Gross		Accumulated			Net		Gross		Accumulated			Net
			Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
			Amount					Amount		Amount					Amount
	Acquired methodologies/technology		$	7,770	$	(5,471	)	$	2,299	$	8,412	$	(4,372	)	$	4,040
	Acquired methodologies/technology		$	7,770	$	(5,471	)	$	2,299	$	8,412	$	(4,372	)	$	4,040
	Customer relationships		35,774		(15,346		)	20,428		35,766		(11,230		)	24,536
	Customer relationships		35,774		(15,346		)	20,428		35,766		(11,230		)	24,536
	Panel		1,650		(1,316		)	334		1,639		(1,073		)	566
	Panel		1,650		(1,316		)	334		1,639		(1,073		)	566
	Intellectual property		13,576		(3,999		)	9,577		13,571		(2,459		)	11,112
	Intellectual property		13,576		(3,999		)	9,577		13,571		(2,459		)	11,112
	Trade names		2,904		(2,604		)	300		4,153		(3,648		)	505
	Trade names		2,904		(2,604		)	300		4,153		(3,648		)	505
			$	61,674	$	(28,736	)	$	32,938	$	63,541	$	(22,782	)	$	40,759
			$	61,674	$	(28,736	)	$	32,938	$	63,541	$	(22,782	)	$	40,759
	Amortization expense related to intangible assets was approximately $8.0 million, $9.3 million and $9.3 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	The weighted average remaining amortization period by major asset class as of December 31, 2013, is as follows:



		(In years)
	Acquired methodologies/technology	1.8
	Customer relationships	6
	Panel	1.4
	Intellectual property	7.5
	Trade names	1.5
	The estimated future amortization of acquired intangible assets as of December 31, 2013 is as follows:



		(In thousands)
	2014	$	7,704
	2014	$	7,704
	2015	6,689
	2015	6,689
	2016	5,385
	2016	5,385
	2017	4,316
	2017	4,316
	2018	2,169
	2018	2,169
	Thereafter	6,675
	Thereafter	6,675
		$	32,938
		$	32,938

Accrued_Expenses

Accrued Expenses	12 Months Ended
	Dec. 31, 2013
Accrued Liabilities [Abstract]	'
Accrued Expenses	'
	Accrued Expenses
	Accrued expenses consist of the following:



		December 31,
		2013		2012
		(In thousands)

	Payroll and related	$	9,213	$	5,556

	Stock-based compensation	6,061		6,652

	Cost of revenues	5,641		4,892

	Income, sales and other taxes	4,716		2,733

	Professional fees	3,066		1,333

	Other	4,775		3,243

		$	33,472	$	24,409

LongTerm_Debt_and_Other_Financ

Long-Term Debt and Other Financing Arrangement	12 Months Ended
	Dec. 31, 2013
Long-term Debt and Capital Lease Obligations [Abstract]	'
Long-term Debt and Other Financing Arrangement	'
	Long-term Debt and Other Financing Arrangement
	Capital Leases
	The Company has a lease financing arrangement with Banc of America Leasing & Capital, LLC in the amount of $10.0 million, of which the Company can utilize approximately $8.6 million as of December 31, 2013, for future capital leases. This arrangement allows the Company to lease new software, hardware and other computer equipment as it expands its technology infrastructure in support of its business growth. Under this arrangement, the Company may enter into new capital leases prior to April 30, 2014. Some of the amounts the Company has utilized to date under this arrangement have not lowered the amount available for future capital leases, because those amounts have been assigned by Banc of America Leasing & Capital, LLC under separate third-party arrangements. In addition, the Company enters into capital leases under non-committed arrangements, typically directly with equipment manufacturers. Future minimum payments under capital leases with initial terms of one year or more are as follows:



		(In thousands)
	2014	$	11,254

	2015	9,133

	2016	4,652

	2017	58

	2018	—

	Total minimum lease payments	25,097

	Less amount representing interest	(1,416		)
	Present value of net minimum lease payments	23,681

	Less current portion	10,351

	Capital lease obligations, long-term	$	13,330

	During the years ended December 31, 2013, 2012 and 2011, the Company acquired $14.4 million and $7.8 million, and $5.4 million respectively, in computer equipment through the issuance of capital leases. This non-cash investing activity has been excluded from the consolidated statement of cash flows.
	Revolving Credit Facility
	On September 26, 2013, the Company entered into a Credit Agreement (the “Credit Agreement”) with several banks (the "Lenders"). Bank of America, N.A. (“Bank of America”) is the administrative agent, and lead lender of this Revolving Credit Facility. The Credit Agreement provides for a five-year revolving credit facility of $100.0 million, which includes a $10.0 million sublimit for issuance of standby letters of credit, a $10 million sublimit for swing line loans and a $10.0 million sublimit for alternative currency lending. The maturity date of the Credit Agreement is September 26, 2018. The Credit Agreement also contains an expansion option permitting the Company to request an increase of the credit facility up to an aggregate additional $50 million, subject to certain conditions. Borrowings under the Revolving Credit Facility shall be used towards working capital and other general corporate purposes as well as for the issuance of letters of credit, and the repurchase of equity interests in the Company not to exceed $50 million during the five-year revolver term. Pursuant to the Credit Agreement, the obligations under the Revolving Credit Facility are secured by a security interest in substantially all of the Company’s cash and cash equivalents.
	Base rate loans and swing line loans will bear interest at the Base Rate plus the Applicable Rate, as such terms are defined in the Credit Agreement and summarized below. The Base Rate is the highest rate of the following: (a) the Federal Funds rate plus 0.50%, (b) the publicly announced Bank of America prime rate, and (c) the Eurocurrency rate, as defined in the Credit Agreement plus 1.0%. The Applicable Rate for base rate loans and swing line loans is 0.50% to 1.50% depending on the Company’s funded debt-to-EBITDA ratio at the end of each fiscal quarter. Amounts supporting letters of credit bear interest at the applicable rate for revolving loans. Each Eurocurrency rate loan will bear interest at the Eurocurrency Rate plus the Applicable Rate ranging from 1.50% to 2.50% depending on the Company's funded debt-to-EBITDA ratio at the end of each fiscal quarter. Beginning on September 26, 2013 through the maturity date of the five-year revolver term, the Company is obligated to pay a fee, payable quarterly in arrears, based on the average unused portion of the available amounts under the Credit Agreement at a rate of 0.20% to 0.35% per annum depending on the Company’s funded debt-to-EBITDA ratio at the end of each fiscal quarter.
	The Credit Agreement contains various usual and customary covenants, including, but not limited to: financial covenants requiring maximum funded debt-to-EBITDA ratio and cash flow-to-fixed charge ratios and covenants relating to the Company’s ability to dispose of assets, make certain acquisitions, be acquired, incur indebtedness, grant liens and make certain investments. As of December 31, 2013 the Company was in full compliance with all covenants contained in the Credit Agreement and remains so as of the date of this report.
	As of December 31, 2013, the Company did not have an outstanding balance under the Credit Agreement.
	The Company maintains letters of credit in lieu of security deposits with respect to certain office leases as well as to satisfy performance guarantees under certain contracts. As of December 31, 2013, $4.0 million in letters of credit were outstanding, leaving $6.0 million available for additional letters of credit. These letters of credit may be reduced periodically provided the Company meets the conditional criteria of each related lease agreement.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Leases
	In addition to equipment financed through capital leases, the Company is obligated under various noncancelable operating leases for office facilities and equipment. These leases generally provide for renewal options and escalation increases. Future minimum payments under noncancelable lease agreements with initial terms of one year or more are as follows:



		(In thousands)
	2014	$	10,107

	2015	10,079

	2016	9,997

	2017	9,766

	2018	8,929

	Thereafter	28,637

	Total minimum lease payments	$	77,515

	Total rent expense, under non-cancellable operating leases, was $8.9 million, $8.4 million and $6.7 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	During the years ended December 31, 2013 and 2012, the Company recorded $2.3 million and $1.3 million, respectively, of deferred rent and capitalized assets as a result of landlord allowances in connection with its Reston, New York and London office leases. The deferred rent will be applied to rent expense recognized by the Company over the lease terms.
	Contingencies
	On December 20, 2011, the Company entered into a Patent Purchase, License and Settlement Agreement (the “Patent Purchase Agreement”) with Nielsen and NetRatings in order to resolve the Litigation. In connection with the Patent Purchase Agreement, the Company and Nielsen entered into a Purchase Agreement (the “Stock Purchase Agreement”) and a Voting Agreement (the “Voting Agreement”, and together with the Patent Purchase Agreement and the Stock Purchase Agreement, the “Settlement Documents”). Pursuant to the Settlement Documents, and subject to retained rights by Nielsen, the Company acquired ownership of the four Nielsen families of patents asserted in litigation. The Company also granted Nielsen worldwide licenses for the families of the four patents the Company asserted in litigation. Both parties agreed not to bring any patent action against the other for the next three years. In addition, the Company issued Nielsen 974,358 shares of the Company’s common stock, subject to certain restrictions.
	The Company performed a valuation analysis to determine the fair value of the various elements included within the Settlement Documents. The Company determined the fair value of the consideration given to Nielsen in the form of restricted common stock to be $16.2 million. The fair value of the restricted common stock was determined by factoring in an appropriate discount to the current market price associated with the one year holding period that was placed on the common stock. The discount associated with this lack of marketability was estimated based on the cost to hedge the issued shares with a put option. The put option was valued using the Black-Scholes Option Pricing Model. The Company then determined the fair value of the acquired patents and the litigation settlement to be $26.0 million and $12.2 million, respectively, using the relief from royalty method, which is an income approach, to determine the present value of expected future cash flows and cash flows during the period of claimed patent infringement.
	The fair value of the elements in the arrangement exceeded the fair value of the consideration paid. As such, the Company allocated the consideration paid to the elements based on relative fair value, resulting in $11.0 million allocated to the acquired patents and $5.2 million allocated to the litigation settlement. The $11.0 million allocated to the acquired patents will be amortized over the remaining legal life of the various patents acquired, with approximately 50% of the value being amortized through July 2018 and the other 50% being amortized through September 2024.
	In June 2013 the Company settled certain patent litigation lawsuits that we initiated against certain third-parties. The Company recognized a net gain of $1.4 million during 2013 related to these settlements.
	On August 23, 2011, the Company received notice that Mike Harris and Jeff Dunstan, individually and on behalf of a class of similarly situated individuals, filed a lawsuit against the Company in the United States District Court for the Northern District of Illinois, Eastern Division, alleging, among other things, violations by the Company of the Stored Communications Act, the Electronic Communications Privacy Act, Computer Fraud and Abuse Act and the Illinois Consumer Fraud and Deceptive Practices Act as well as unjust enrichment. The complaint seeks unspecified damages, including statutory damages per violation and punitive damages, injunctive relief and reasonable attorneys' fees of the plaintiffs. In October 2012, the plaintiffs filed an amended complaint which, among other things, removed the claim relating to alleged violations of the Illinois Consumer Fraud and Deceptive Practices Act. The court has certified a class, with trial expected in the second quarter of 2014. It is not possible for the Company to estimate a potential range of loss at this time.
	From time to time, the Company is exposed to unasserted potential claims encountered in the normal course of business. Although the outcome of any legal proceeding cannot be predicted with certainty, management believes that the final outcome and resolution of current matters, if any will not materially affect the Company’s consolidated financial position or results of operations.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'

		Income Taxes
	The components of (loss) income before income tax for the years ended December 31, 2013, 2012 and 2011 are as follows:



			2013				2012				2011
			(In thousands)
	Domestic		$	1,943			$	(6,350	)		$	(10,106	)

	Foreign		150				(3,065		)		(8,658		)

	Total		$	2,093			$	(9,415	)		$	(18,764	)

	Income tax (benefit) provision is comprised of the following:



			Year Ended
			December 31,
			2013				2012				2011
			(In thousands)
	Current:
	Federal		$	152			$	(70	)		$	140

	State		373				114				182

	Foreign		1,520				1,434				1,060

	Total		2,045				1,478				1,382

	Deferred:
	Federal		3,518				1,278				(3,492		)

	State		392				(635		)		(832		)

	Foreign		(1,529		)		253				(32		)

	Total		2,381				896				(4,356		)

	Income tax (benefit) provision		$	4,426			$	2,374			$	(2,974	)

	A reconciliation of the statutory United States income tax rate to the effective income tax rate is as follows:



			Year Ended
			December 31,
			2013			2012			2011
	Statutory federal tax rate		35	%		35	%		35	%
	State taxes, net of federal benefit		23.8			3.6			2.3

	Nondeductible items		56.9			(15.5	)		(5.7	)

	Foreign rate differences		96.5			(2.9	)		(5.4	)

	Change in statutory tax rates		4.3			(0.9	)		(0.6	)

	Change in valuation allowance		(144.8	)		(10.6	)		(8.9	)
	Stock compensation shortfalls		41.2			(4.3	)		—

	True-ups and other adjustments		(5.7	)		(0.4	)		0.1

Subpart F income recapture		96.3			—			—

Market-based stock awards		—			(27.8	)		—

Foreign tax withholding		4.3			(0.8	)		(0.6	)

Uncertain tax positions		3.7			(0.6	)		(0.3	)

Effective tax rate		211.5	%		(25.2	)%		15.9	%
The Company recognized income tax expense of approximately $4.4 million during the year ended December 31, 2013, which is comprised of current tax expense of $0.5 million related to federal alternative minimum tax and state income tax liabilities, $1.5 million of foreign income tax expense, and deferred tax expense of approximately $2.4 million related to temporary differences between the tax treatment and financial reporting treatment for certain items. Included within the total deferred tax expense of $2.4 million is $2.3 million of deferred tax expense related to the establishment of a deferred tax liability for Subpart F income that will be recognized in a future tax year and $2.9 million of deferred tax benefit related to the release of valuation allowances in certain foreign jurisdictions, which have a statutory rate of approximately 20%.
The Company recognized income tax expense of approximately $2.4 million during the year ended December 31, 2012, which is comprised of current tax expense of $0.1 million related to federal alternative minimum tax and state income tax liabilities, $1.4 million of foreign income tax expense, and deferred tax expense of approximately $0.9 million related to temporary differences between the tax treatment and financial reporting treatment for certain items. Included within the total deferred tax expense of $0.9 million is $2.6 million of deferred tax expense associated with the write-off of a deferred tax asset related to certain market-based stock awards that will never be realized due to the expiration of the stock awards prior to vesting.
The Company recognized an income tax benefit of approximately $3.0 million during the year ended December 31, 2011, which is comprised of current tax expense of $0.3 million related to federal alternative minimum tax and state income tax liabilities, $1.1 million of foreign income tax expense, and a deferred tax benefit of approximately $4.4 million related primarily to differences between the tax treatment and financial reporting treatment for certain items, most notably the Nielsen transaction.

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax reporting purposes. Significant components of the Company’s net deferred income taxes are as follows:



		December 31,
		2013				2012
		(In thousands)
Deferred tax assets:
Net operating loss carryforwards		$	6,658			$	13,352

Capital loss carryforwards		778				769

Tax credits		1,817				1,671

Allowance for doubtful accounts		506				722

Accrued salaries and benefits		724				256

Deferred revenues		922				717

Capital leases		8,955				4,853

Deferred compensation		7,170				6,082

Deferred rent		4,937				4,210

Other		1,018				707

Gross deferred tax assets		33,485				33,339

Valuation allowance		(1,197		)		(4,045		)
Net deferred tax assets		32,288				29,294

Deferred tax liabilities:
Intangible assets		(752		)		(1,535		)
Property and equipment		(9,387		)		(5,577		)
Subpart F income recapture		(2,310		)		—

Prepaid maintenance		(317		)		(156		)
Other		(81		)		(168		)
Total deferred tax liabilities		(12,847		)		(7,436		)
Net deferred tax asset		$	19,441			$	21,858


As of December 31, 2013 and 2012, the Company had valuation allowances of $1.2 million and $4.0 million, respectively, against certain deferred tax assets. The valuation allowance as of December 31, 2013 relates to the deferred tax assets of certain foreign subsidiaries (primarily net operating loss carryforwards) that are either loss companies or are in their start-up phases, the U.S. capital loss carryforwards and certain state net operating loss carryforwards. To the extent the Company determines that, based on the weight of available evidence, all or a portion of its valuation allowance is no longer necessary, the Company will recognize an income tax benefit in the period such determination is made for the reversal of the valuation allowance. If management determines that, based on the weight of available evidence, it is more-likely-than-not that all or a portion of the net deferred tax assets will not be realized, the Company may recognize income tax expense in the period such determination is made to increase the valuation allowance. It is possible that any such reduction of or addition to the Company’s valuation allowance may have a material impact on the Company’s results from operations.
As of December 31, 2013, the Company concluded that it was not more-likely-than-not that a portion of our deferred tax assets related to certain state and foreign net operating losses would be realized and that an increase to the valuation allowance of $0.1 million was necessary. The Company also concluded that it was more-likely-than-not that a substantial portion of our deferred tax assets in certain other foreign jurisdictions, primarily the Netherlands, would be realized and determined that it was appropriate to release valuation allowances of $2.9 million. In making that determination, the Company considered the income generated in these foreign jurisdictions during 2013, the guaranteed profit margins in place for these entities as a result of the Company’s transfer pricing model, the tax impact of the restructuring that is currently being implemented, the current overall economic environment, and the projected income of these entities in future years. In addition, during 2013, the Company wrote-off certain deferred tax assets related to net operating losses that will never be realized. As these deferred tax assets had a full valuation allowance recorded against them, the associated valuation allowance of $0.1 million was released.

As of December 31, 2012, the Company concluded that it was not more-likely-than-not that a substantial portion of its deferred tax assets related to certain state net operating losses would be realized and determined that it was appropriate to establish a valuation allowance of $0.3 million against its state deferred tax assets. The Company also concluded that it was not more-likely-than-not that a substantial portion of its deferred tax assets in certain other foreign jurisdictions, primarily the Netherlands, would be realized and that an increase to the valuation allowance of $1.2 million was necessary. In making that determination, the Company considered the losses incurred in these foreign jurisdictions during 2012, the current overall economic environment, and the uncertainty regarding the profitability of certain foreign operations currently in start-up phase. In addition, during 2012, the Company wrote-off certain deferred tax assets related to net operating losses that will never be realized. As these deferred tax assets had a full valuation allowance recorded against them, the associated valuation allowance of $0.2 million was released.
The following is a summary of activities in the deferred tax asset valuation allowance for the fiscal years indicated:



		December 31,
		2013				2012
		(In thousands)
Deferred Tax Valuation Allowance
Beginning Balance		$	(4,045	)		$	(2,741	)
Additions		(132		)		(1,511		)
Reductions		2,980				207

Ending Balance		$	(1,197	)		$	(4,045	)
As of December 31, 2013, the Company had federal and state net operating loss carryforwards for tax purposes of approximately $37.2 million and $38.3 million, respectively. As of December 31, 2012, the Company had federal and state net operating loss carryforwards for tax purposes of approximately $46.8 million and $43.1 million, respectively. These net operating loss carryforwards begin to expire in 2022 for federal income tax purposes and begin to expire in 2014 for state income tax purposes. At December 31, 2013, the Company had an aggregate net operating loss carryforward for tax purposes related to its foreign subsidiaries of $20.8 million, which begins to expire in 2017. In addition, at December 31, 2013, the Company had alternative minimum tax credit carryforwards of $1.5 million which can be carried forward indefinitely and research & development credit carryforwards of $0.7 million which begin to expire in 2025.
The exercise of certain stock options and the vesting of certain restricted stock awards during the years ended December 31, 2013 and 2012 generated income tax deductions equal to the excess of the fair market value over the exercise price or grant date fair value, as applicable. The Company will not recognize a deferred tax asset with respect to the excess of tax over book stock compensation deductions until the tax deductions actually reduce current taxes payable. As such, the Company has not recorded a deferred tax asset in the accompanying financial statements related to the additional net operating losses generated from the windfall tax deductions associated with the exercise of these stock options and the vesting of the restricted stock awards. If and when the Company utilizes these net operating losses to reduce income taxes payable, the tax benefit will be recorded as an increase in additional paid-in capital. As of December 31, 2013 and December 31, 2012, the cumulative amounts of net operating losses relating to such option exercises and vesting events that have been included in the gross net operating loss carryforwards above are $32.5 million and $28.9 million, respectively. During the years ended December 31, 2013 and 2012, the Company recognized windfall tax benefits of approximately $0.1 million, related to certain state and foreign tax jurisdictions, which were recorded as an increase to additional paid-in capital.
During the years ended December 31, 2013 and 2012, certain stock options were exercised and certain shares related to restricted stock awards vested at times when the Company’s stock price was substantially lower than the fair value of those shares at the time of grant. As a result, the income tax deduction related to such shares is less than the expense previously recognized for book purposes. Such shortfalls reduce additional paid-in capital to the extent relevant windfall tax benefits have been previously recognized. As described above, the Company recognized a portion of the windfall tax benefits in 2013 and recorded an increase to additional paid-in capital. Therefore, $0.1 million of shortfalls has not been included in income tax expense but has reduced additional paid-in capital for the year ended December 31, 2013. The remaining impact of the shortfalls totaling $0.9 million has been included in income tax expense. As of December 31, 2012, the Company recognized a portion of the windfall tax benefits and recorded an increase to additional paid-in capital. Therefore, the impact of the shortfalls totaling $0.2 million was not included in income tax expense but reduced additional paid-in capital for the year ended December 31, 2012. Looking forward the Company cannot predict the stock compensation shortfall impact because of dependency upon future market price performance of our stock.
Under the provisions of Internal Revenue Code Section 382, certain substantial changes in the Company’s ownership may result in a limitation on the amount of U.S. net operating loss carryforwards that could be utilized annually to offset future taxable income and taxes payable. A portion of the Company’s net operating loss carryforwards are subject to an annual limitation under Section 382 of the Internal Revenue Code. We do not expect that this limitation will impact our ability to utilize all of our net operating losses prior to their expiration. Additionally, despite the net operating loss carryforwards, the Company may have a future tax liability due to alternative minimum tax, foreign tax or state tax requirements.
The Company intends to indefinitely reinvest the undistributed earnings from its foreign subsidiaries. As of December 31, 2013, the Company has not recorded U.S. income tax expense related to undistributed foreign earnings of approximately $6.5 million.
For uncertain tax positions, the Company uses a more-likely-than-not recognition threshold based on the technical merits of the tax position taken. Tax positions that meet the more-likely-than-not recognition threshold are measured as the largest amount of tax benefits determined on a cumulative probability basis, which are more-likely-than-not to be realized upon ultimate settlement in the financial statements. As a result, the Company has unrecognized tax benefits, which are tax benefits related to uncertain tax positions which have been or will be reflected in income tax filings that have not been recognized in the financial statements due to potential adjustments by taxing authorities in the applicable jurisdictions. As of December 31, 2013, 2012 and 2011, the Company had unrecognized tax benefits of $1.4 million all of which would affect the Company’s tax rate if recognized. The Company anticipates that approximately $0.1 million of unrecognized tax benefits will reverse during the next year due to the filing of related tax returns and the expiration of statutes of limitation. The changes in the liability for unrecognized income tax benefits as of December 31, 2013, 2012 and 2011 resulted from the following:



		December 31,
		2013				2012				2011
		(In thousands)
Unrecognized tax benefits beginning balance		$	1,418			$	1,386			$	2,376

Increase related to tax positions of prior years		36				69				1

Increase related to acquired tax positions recorded through purchase accounting		—				—				1

Increase related to tax positions of the current year		45				4				17

Decrease related to tax positions of prior years		(21		)		(27		)		(959		)
Decrease due to settlements		(4		)		—				(42		)

Decrease due to lapse in statutes of limitations		(31		)		(14		)		(8		)
Unrecognized tax benefits ending balance		$	1,443			$	1,418			$	1,386

The Company recognizes interest and penalties related to income tax matters in income tax expense. As of December 31, 2013 and 2012, the amount of accrued interest and penalties on unrecognized tax benefits was $0.7 million. The Company or one of its subsidiaries files income tax returns in the U.S. federal jurisdiction, and various states and foreign jurisdictions. For income tax returns filed by the Company, the Company is no longer subject to U.S. federal examinations by tax authorities for years before 2010 or state and local tax examinations by tax authorities for years before 2009, although tax attribute carryforwards generated prior to these years may still be adjusted upon examination by tax authorities.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity	'
	Stockholders’ Equity
	1999 Stock Option Plan and 2007 Equity Incentive Plan
	Prior to the effective date of the registration statement for the Company’s initial public offering (“IPO”) on June 26, 2007, eligible employees and non-employees were awarded options to purchase shares of the Company’s common stock, restricted stock or restricted stock units pursuant to the Company’s 1999 Stock Plan (the “1999 Plan”). Upon the effective date of the registration statement of the Company’s IPO, the Company ceased using the 1999 Plan for the issuance of new equity awards. Upon the closing of the Company’s IPO on July 2, 2007, the Company established its 2007 Equity Incentive Plan, as amended (the “2007 Plan” and together with the 1999 Plan, the “Plans”). The 1999 Plan will continue to govern the terms and conditions of outstanding awards granted thereunder, but no further shares are authorized for new awards under the 1999 Plan. As of December 31, 2013 and December 31, 2012, the Plans provided for the issuance of a maximum of approximately 9.9 million shares and 8.5 million shares, respectively, of common stock. In addition, the 2007 Plan provides for annual increases in the number of shares available for issuance thereunder on the first day of each fiscal year beginning with the 2008 fiscal year, equal to the lesser of: (i) 4% of the outstanding shares of the Company’s common stock on the last day of the immediately preceding fiscal year; (ii) 1,800,000 shares; or (iii) such other amount as the Company’s board of directors may determine. The vesting period of options granted under the Plans is determined by the Board of Directors, although, for service-based options the vesting has historically been generally ratably over a four-year period. Options generally expire 10 years from the date of the grant. Effective January 1, 2013, the shares available for grant increased by 1,427,177 pursuant to the automatic share reserve increase provision under the Plans. Accordingly, as of December 31, 2013, a total of 3,066,148 shares were available for future grant under the 2007 Plan.
	The Company determines the fair value of stock option awards using the Black-Scholes option-pricing formula and a single option award approach. The fair value of market-based stock options and restricted stock units is determined using a Monte Carlo simulation embedded in a lattice model. The fair value of restricted stock awards is based on the closing price of our common stock on the date of grant. The Company then amortizes the fair value of awards expected to vest on a ratable straight-line basis over the requisite service periods of the awards, which is generally the period from the grant date to the end of the vesting period.
	A summary of the Plans is presented below:


			Number of			Weighted-				Weighted			Aggregate
			Shares			Average				Average			Intrinsic
						Exercise				Remaining			Value (in
						Price				Contractual			thousands)
										Term
										(in years)
	Options outstanding at December 31, 2012		90,552			$	4.38			2.99			$	851

	Options granted		—			$	—			—			—

	Options exercised		(52,063	)		$	4.37			—			$	1,028

	Options forfeited		—			$	—			—			—

	Options expired		(255	)		$	9.73			—			—

	Options outstanding and exercisable at December 31, 2013		38,234			$	4.37			2.09			$	927


	During the three months ended March 31, 2012, the Company granted 210,000 time-based restricted stock awards to the Company's Chief Executive Officer that vest ratably over three years and 380,000 time-based restricted stock awards to members of executive management that vest ratably over four years. In addition, the Company granted its Chief Executive Officer 580,000 shares of the Company's common stock in the form of restricted stock and restricted stock units (the “Performance Award”). The Performance Award represents the maximum number of shares that can vest over a three year period. The Performance Awards vested and will vest based on achievement of revenue and adjusted EBITDA goals during 2012, 2013 and 2014, with the revenue and adjusted EBITDA milestones each carrying a 50% weight. Assuming achievement of 100% of the target performance metrics in each case over a three-year period, the Chief Executive Officer would be eligible to vest in 290,000 total shares, and in any given year 96,666 shares. Assuming achievement of 200% of the target performance metrics in each case over a three-year period, the maximum number permitted under the arrangement, the Chief Executive Officer would be eligible to vest in 580,000 total shares, and in any given year, 193,334 shares. During the year ended December 31, 2013, no stock options were granted.

	A summary of the Plans is presented below:



			Number of			Weighted-
			shares			Average
						Exercise
						Price
	Options outstanding December 31, 2010		1,713,165			$	11.68

	Options granted		—			—

	Options exercised		(203,894	)		1.82

	Options forfeited		(82	)		9.29

	Options expired		(1,670	)		5.91

	Options outstanding December 31, 2011		1,507,519			13.02

	Options granted		—			—

	Options exercised		(367,234	)		0.65

	Options forfeited		(1,048,478	)		18.12

	Options expired		(1,255	)		2.79

	Options outstanding December 31, 2012		90,552			4.38

	Options granted		—			—

	Options exercised		(52,063	)		4.37

	Options forfeited		—			—

Options expired		(255	)		9.73

Options outstanding and exercisable at December 31, 2013		38,234			$	4.37

The following table summarizes information about options outstanding at December 31, 2013:



		Options Outstanding and Exercisable
Range of Exercise Prices		Options			Weighted				Weighted
		Outstanding and Exercisable			Average				Average
					Exercise				Remaining
					Price				Contractual
									Life (Years)
$0.25 - $4.25		16,482			$	2.7			1.63

$4.26 - $7.50		17,248			$	4.74			2.14

$7.51 - $13.66		4,504			$	9.05			3.57

		38,234			$	4.37			2.09

The intrinsic value of exercised stock options is calculated based on the difference between the exercise price and the quoted market price of our common stock as of the close of the exercise date. The aggregate intrinsic value of options exercised for the years ended December 31, 2013, 2012 and 2011 was $1.0 million, $5.0 million and $3.6 million, respectively. The aggregate intrinsic value for all options outstanding and exercisable under the Company’s stock plans as of December 31, 2013 was $0.9 million. The weighted average remaining contractual life for all options outstanding and exercisable under the Company’s stock plans as of December 31, 2013 was 2.09 years. As of December 31, 2013, there is no unrecognized compensation expense related to non-vested stock options granted prior to that date.
Our nonvested stock awards are comprised of restricted stock and restricted stock units. The restricted stock only represents participating securities. The Company has a right of repurchase on such shares that lapse at a rate of twenty-five percent (25)% of the total shares awarded at each successive anniversary of the initial award date, provided that the employee continues to provide services to the Company. In the event that an employee terminates their employment with the Company, any shares that remain unvested and consequently subject to the right of repurchase shall be automatically reacquired by the Company at the original cash purchase price paid by the employee, if any. During the year ended December 31, 2013, 206,360 shares of restricted stock were forfeited and were subsequently retired. A summary of the status for nonvested stock awards as of December 31, 2013 is presented as follows:



Nonvested Stock Awards		Restricted			Restricted			Number of			Weighted
		Stock			Stock			Shares			Average
					Units			Underlying			Grant-
								Awards			Date Fair
											Value
Nonvested at December 31, 2010		1,591,522			405,071			1,996,593			$	15.43

Granted		681,674			243,983			925,657			25.39

Vested		(751,873	)		(116,863	)		(868,736	)		16.01

Forfeited		(135,903	)		(113,097	)		(249,000	)		19.02

Nonvested at December 31, 2011		1,385,420			419,094			1,804,514			$	19.75

Granted		1,706,900			445,368			2,152,268			20.84

Vested		(888,707	)		(168,215	)		(1,056,922	)		18.81

Forfeited		(233,903	)		(229,423	)		(463,326	)		21.34

Nonvested at December 31, 2012		1,969,710			466,824			2,436,534			$	20.82

Granted		484,052			1,025,065			1,509,117			19.95

Vested		(1,196,792	)		(200,651	)		(1,397,443	)		17.91

Forfeited		(206,360	)		(156,312	)		(362,672	)		20.71

Nonvested at December 31, 2013		1,050,610			1,134,926			2,185,536			$	22.1

The aggregate intrinsic value for all non-vested shares of restricted common stock and restricted stock units outstanding as of December 31, 2013 was $62.5 million. The weighted average remaining contractual life for all non-vested shares of restricted common stock and restricted stock units as of December 31, 2013 was 1.10 years.
We granted nonvested stock awards at no cost to recipients during the years ended December 31, 2013, 2012 and 2011. As of December 31, 2013, total unrecognized compensation expense related to non-vested restricted stock and restricted stock units was $27.1 million, which the Company expects to recognize over a weighted average period of approximately 1.18 years. Total unrecognized compensation expense may be increased or decreased in future periods for subsequent grants or forfeitures.
Of the 1,397,443 shares of the Company’s restricted stock and restricted stock units vesting during the year ended December 31, 2013, the Company repurchased 510,328 shares at an aggregate purchase price of approximately $9.3 million pursuant to the stockholder’s right under the Plans to elect to use common stock to satisfy tax withholding obligations. The repurchased shares were subsequently retired.
Common Stock Warrants
As of December 31, 2011, a warrant to purchase 24,375 shares of common stock was outstanding. During the quarter ended June 30, 2012, this warrant was completely exercised on a net basis. As a result, the Company issued 19,895 shares of common stock and received no cash upon the exercise of the warrant.
Shares Reserved for Issuance
At December 31, 2013, the Company had reserved for future issuance the following shares of common stock upon the exercise of options and warrants:



Common stock available for future issuances under the Plans	3,066,148

Common stock reserved for outstanding options and restricted stock units	1,173,160

	4,239,308

Unregistered Sales of Equity Securities
On December 20, 2011, in connection with the execution of the Settlement Documents, as more fully described in footnote 9, the Company issued a total of 974,358 unregistered shares of comScore common stock as consideration.
On August 11, 2011, in connection with its purchase of all the outstanding capital stock of AdXpose, the Company issued a total of 982,285 unregistered shares of comScore common stock as consideration for such acquisition.

Share_Repurchases

Share Repurchases	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Share Repurchases	'

		Share Repurchases

	On June 3, 2013 the Company announced that its board of directors had approved the repurchase of up to $50 million of the Company's common stock. Such repurchases may be made from time to time subject to pre-determined price and volume guidelines established by the Company's board of directors.

	As part of the share repurchase program, shares may be purchased in open market transactions or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Exchange Act. The timing, manner, price and amount of any repurchases will be determined at the Company's discretion, and the share repurchase program may be suspended, terminated or modified at any time for any reason. Shares repurchased are classified as Treasury Stock and presented as a deduction from Stockholders' Equity. Cash paid for share repurchases during 2013, under the announced share repurchase program, was as follows:



	(Amounts in millions, except share and per share data)
	Total number of shares repurchased	483,437
	Average price paid per share	$27.12
	Total share repurchases	$13.10

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]	'
Employee Benefit Plans	'
	Employee Benefit Plans
	The Company has a 401(k) Plan for the benefit of all U.S. employees who meet certain eligibility requirements. This plan covers substantially all of the Company’s full-time U.S. employees. The Company made approximately $0.5 million, $0.5 million and $0.4 million in contributions to the 401(k) Plan for the years ended December 31, 2013, 2012 and 2011, respectively.

Geographic_Information

Geographic Information	12 Months Ended
	Dec. 31, 2013
Segments, Geographical Areas [Abstract]	'
Geographic Information	'
	Geographic Information
	The Company attributes revenues to customers based on the location of the customer. The composition of the Company’s sales to unaffiliated customers between those in the United States and those in other locations for each year is set forth below:



		Year Ended December 31,
		2013		2012		2011
		(In thousands)
	United States	$	202,743	$	183,380	$	172,311

	Europe	49,480		43,456		35,797

	Canada	12,655		11,625		9,859

	Other	21,982		16,732		14,425

	Total Revenues	$	286,860	$	255,193	$	232,392

	The composition of the Company’s property and equipment between those in the United States and those in other countries as of the end of each year is set forth below:



		December 31,
		2013		2012
		(In thousands)
	United States	$	32,370	$	24,810

	Europe	4,655		5,477

	Canada	256		291

	Other	714		840

	Total	$	37,995	$	31,418

Quarterly_Financial_Informatio

Quarterly Financial Information	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Financial Information (Unaudited)	'
	Quarterly Financial Information (Unaudited)



			2013
			First				Second				Third				Fourth
			(In thousands, except share and per share data)
	Revenues		$	68,848			$	69,911			$	71,606			$	76,495

	Cost of revenues (1)		22,554				21,610				21,603				24,196

	Selling and marketing (1)		24,458				25,491				24,255				25,743

	Research and development (1)		10,223				9,803				10,441				10,558

	General and administrative (1)		9,012				11,238				12,492				13,707

	Amortization of intangible assets		2,151				1,936				1,956				1,914

	Gain on asset disposition		(210		)		—				(4		)		—

	Settlement of litigation		—				(1,160		)		—				(200		)

	Total expenses from operations		68,188				68,918				70,743				75,918

	Income from operations		660				993				863				577

	Interest and other (expense) income, net		(164		)		(168		)		(238		)		(368		)
	Gain (loss) from foreign currency transactions		(340		)		93				82				103

	Income before income taxes		156				918				707				312

	Provision for income taxes		(2,179		)		(1,316		)		(789		)		(142		)
	Net income (loss)		$	(2,023	)		$	(398	)		$	(82	)		$	170

	Net loss available to common stockholders per common share:
	Basic		$	(0.06	)		$	(0.01	)		$	—			$	—

	Diluted		$	(0.06	)		$	(0.01	)		$	—			$	—

	Weighted-average number of shares used in per share calculations:
	Basic		34,113,786				34,414,301				34,502,456				35,487,041

	Diluted		34,113,786				34,414,301				34,502,456				35,770,458


	(1) Amortization of stock-based compensation is included in the line items above as follows
	Cost of revenues		$	716			$	832			$	887			$	911

	Selling and marketing		2,813				3,219				2,487				2,543

	Research and development		614				602				947				858

	General and administrative		856				2,493				2,922				3,335




			2012
			First				Second				Third				Fourth
			(In thousands, except share and per share data)
	Revenues		$	62,275			$	60,291			$	64,273			$	68,354

Cost of revenues (1)		20,401				20,371				21,933				23,674

Selling and marketing (1)		21,345				22,235				22,928				25,341

Research and development (1)		8,036				8,267				8,963				8,728

General and administrative (1)		9,106				9,725				9,400				9,903

Amortization of intangible assets		2,320				2,302				2,385				2,282

Impairment of intangible assets		—				3,349				—				—

Total expenses from operations		61,208				66,249				65,609				69,928

Income (loss) from operations		1,067				(5,958		)		(1,336		)		(1,574		)

Interest and other (expense) income, net		(198		)		(169		)		(174		)		(329		)
Gain (loss) from foreign currency transactions		(263		)		(304		)		(205		)		28

Income (loss) before income taxes		606				(6,431		)		(1,715		)		(1,875		)

Benefit (provision) for income taxes		(1,077		)		(156		)		(1,403		)		262

Net loss		$	(471	)		$	(6,587	)		$	(3,118	)		$	(1,613	)
Net loss available to common stockholders per common share:
Basic		$	(0.01	)		$	(0.20	)		$	(0.09	)		$	(0.05	)
Diluted		$	(0.01	)		$	(0.20	)		$	(0.09	)		$	(0.05	)
Weighted-average number of shares used in per share calculations:
Basic		32,889,119				33,189,994				33,470,628				33,705,129

Diluted		32,889,119				33,189,994				33,470,628				33,705,129


(1) Amortization of stock-based compensation is included in the line items above as follows
Cost of revenues		$	551			$	653			$	636			$	641

Selling and marketing		2,183				3,001				3,113				3,986

Research and development		405				485				504				525

General and administrative		1,951				2,200				1,911				2,151

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Basis of Presentation and Consolidation

Use of Estimates

Fair Value Measurements

Level 1 — observable inputs such as quoted prices in active markets;

Level 2 — inputs other than the quoted prices in active markets that are observable either directly or indirectly;

Level 3 — unobservable inputs of which there is little or no market data, which require the Company to develop its own assumptions.

Fair Value Measurements Using

31-Mar-13

Quoted

Significant

Total Gains (Losses)

Prices in

Other

Unobservable

Active

Observable

Inputs

Markets for

Inputs

Identical

Assets

(Level 1)

(Level 2)

(Level 3)

Description

(In thousands)

Long-lived assets held and used

1,182

—

Fair Value Measurements Using

30-Jun-12

Quoted

Significant

Total Gains (Losses)

Prices in

Other

Unobservable

Active

Observable

Inputs

Markets for

Inputs

Identical

Assets

(Level 1)

(Level 2)

(Level 3)

Description

(In thousands)

Long-lived assets held and used

2,500

(3,349

)

Cash and Cash Equivalents and Investments

Cash and Cash Equivalents

Interest income on investments was $0.2 million, $0.1 million and $0.1 million for the years ended December 31, 2013, 2012 and 2011, respectively.

Accounts Receivable

Property and Equipment

Business Combinations

Goodwill and Intangible Assets

Intangible assets with finite lives are amortized using the straight-line method over the following useful lives:

Useful

Lives

(Years)

Acquired methodologies/technology

3 to 10

Customer relationships

3 to 12

Panel

Intellectual property

7 to 13

Trade names

2 to 10

Impairment of Long-Lived Assets

Lease Accounting

Foreign Currency

Operating Segment Information

Revenue Recognition

Cost of Revenues

Costs of Revenues

Selling And Marketing

Selling and Marketing

Research and Development

General and Administrative

Concentration of Credit Risk

Advertising Costs

Stock-Based Compensation

Income Taxes

Earnings Per Share

The following table provides a reconciliation of the numerators and denominators used in computing basic and diluted net (loss) income per common share:

Year Ended December 31,

2013

2012

2011

(In thousands, except share data)

Calculation of basic and diluted net income per share:

Net (loss) income

(2,333

)

(11,789

)

(15,790

)

Net (loss) income per common share:

Basic

(0.07

)

(0.35

)

(0.49

)

Diluted

(0.07

)

(0.35

)

(0.49

)

Weighted-average shares outstanding-common stock, basic

34,443,126

33,244,798

32,289,877

Dilutive effect of

Options to purchase common stock

—

Unvested restricted stock units

—

Warrants to purchase common stock

—

Weighted-average shares outstanding-common stock, diluted

34,443,126

33,244,798

32,289,877

Recent Pronouncements

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
Summary of Significant Accounting Policies (Tables)	Dec. 31, 2013
Accounting Policies [Abstract]	'
Fair value measurments on a nonrecurring basis	'
	During the first quarter of 2013, certain intangible assets acquired were measured at fair value using significant unobservable inputs (Level 3) as described in Note 4. During the year ended December 31, 2013, the Company recorded these assets as follows:


						Fair Value Measurements Using
			31-Mar-13			Quoted		Significant		Significant		Total Gains (Losses)
						Prices in		Other		Unobservable
						Active		Observable		Inputs
						Markets for		Inputs
						Identical
						Assets
						(Level 1)		(Level 2)		(Level 3)
	Description		(In thousands)
	Long-lived assets held and used		$	1,182						$	1,182	$	—
	Long-lived assets held and used		$	1,182						$	1,182	$	—
	During the second quarter of 2012, certain intangible assets were measured at fair value using significant unobservable inputs (Level 3) as described in Note 5. During the year ended December 31, 2012, the Company recorded an impairment charge of $3.3 million pertaining to these assets as follows:


						Fair Value Measurements Using
			30-Jun-12			Quoted		Significant		Significant		Total Gains (Losses)
						Prices in		Other		Unobservable
						Active		Observable		Inputs
						Markets for		Inputs
						Identical
						Assets
						(Level 1)		(Level 2)		(Level 3)
	Description		(In thousands)
	Long-lived assets held and used		$	2,500						$	2,500	$	(3,349	)
	Long-lived assets held and used		$	2,500						$	2,500	$	(3,349	)
Allowance for doubtful accounts	'
	The following is a summary of activities in the allowance for doubtful accounts for the fiscal years indicated:



		Year Ended December 31,
		2013			2012				2011
		(In thousands)
	Allowance for Doubtful Accounts
	Beginning Balance	$	(1,117	)	$	(903	)		$	(725	)
	Additions	(1,248		)	(1,429		)		(220		)
	Reductions, (recoveries) and write-offs	698			1,215				42
	Reductions, (recoveries) and write-offs	698			1,215				42
	Ending Balance	$	(1,667	)	$	(1,117	)		$	(903	)
Schedule of intangible assets with finite lives	'
	Intangible assets with finite lives are amortized using the straight-line method over the following useful lives:



		Useful
		Lives
		(Years)
	Acquired methodologies/technology	3 to 10
	Acquired methodologies/technology	3 to 10
	Customer relationships	3 to 12
	Customer relationships	3 to 12
	Panel	7
	Panel	7
	Intellectual property	7 to 13
	Intellectual property	7 to 13
	Trade names	2 to 10
	Trade names	2 to 10
Reconciliation of basic and diluted net (loss) income per common share	'
	The following table provides a reconciliation of the numerators and denominators used in computing basic and diluted net (loss) income per common share:



		Year Ended December 31,
		2013			2012				2011
		(In thousands, except share data)
	Calculation of basic and diluted net income per share:
	Net (loss) income	$	(2,333	)	$	(11,789	)		$	(15,790	)
	Net (loss) income per common share:
	Basic	(0.07		)	(0.35		)		(0.49		)
	Diluted	(0.07		)	(0.35		)		(0.49		)
	Weighted-average shares outstanding-common stock, basic	34,443,126			33,244,798				32,289,877
	Weighted-average shares outstanding-common stock, basic	34,443,126			33,244,798				32,289,877
	Dilutive effect of
	Options to purchase common stock	—			—				—
	Options to purchase common stock	—			—				—
	Unvested restricted stock units	—			—				—
	Unvested restricted stock units	—			—				—
	Warrants to purchase common stock	—			—				—
	Warrants to purchase common stock	—			—				—
	Weighted-average shares outstanding-common stock, diluted	34,443,126			33,244,798				32,289,877
	Weighted-average shares outstanding-common stock, diluted	34,443,126			33,244,798				32,289,877

Asset_Disposition_Tables

Asset Disposition (Tables)	12 Months Ended
	Dec. 31, 2013
Asset Disposition Table [Abstract]	'
Asset Disposition	'
	As a result of the disposition, during the three months ended March 31, 2013, the Company recorded a gain on the Disposition of $0.2 million, determined as follows (in thousands):


	Cash proceeds received at closing, net	$	160

	Proceeds receivable (placed in escrow)	750

	Fair value of licensed intellectual property	1,182

		2,092

	Carrying value of assets disposed	(1,436		)
	Goodwill allocated to disposition	(289		)
	Fair value of accelerated equity awards	(157		)
	Gain on disposition	$	210

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property and Equipment Under Capital Lease Obligation	'
	Property and equipment, including equipment under capital lease obligations, consists of the following:



		December 31,
		2013			2012
		(In thousands)
	Computer equipment	$	60,673		$	39,570

	Computer software	5,764			10,773

	Office equipment and furniture	5,156			4,570

	Automobiles	1,644			1,329

	Leasehold improvements	15,785			14,119

	Total, including capital leases of $43,776 and $25,786, respectively	89,022			70,361

	Less: accumulated depreciation and amortization, including capital leases of $22,430 and $12,668, respectively	(51,027		)	(38,943		)
		$	37,995		$	31,418

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
Goodwill and Intangible Assets (Tables)	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Carrying Value of Goodwill	'
	The change in the carrying value of goodwill for the year ended December 31, 2013 is as follows (in thousands):



	Balance as of December 31, 2012	$	102,900
	Balance as of December 31, 2012	$	102,900
	Goodwill allocated to ARS disposition	(289		)
	Translation adjustments	703
	Translation adjustments	703
	Balance as of December 31, 2013	$	103,314
	Balance as of December 31, 2013	$	103,314
Schedule of Acquired Intangible Assets	'
	The carrying values of the Company’s amortized acquired intangible assets are as follows (in thousands):



			31-Dec-13							31-Dec-12
			Gross		Accumulated			Net		Gross		Accumulated			Net
			Carrying		Amortization			Carrying		Carrying		Amortization			Carrying
			Amount					Amount		Amount					Amount
	Acquired methodologies/technology		$	7,770	$	(5,471	)	$	2,299	$	8,412	$	(4,372	)	$	4,040
	Acquired methodologies/technology		$	7,770	$	(5,471	)	$	2,299	$	8,412	$	(4,372	)	$	4,040
	Customer relationships		35,774		(15,346		)	20,428		35,766		(11,230		)	24,536
	Customer relationships		35,774		(15,346		)	20,428		35,766		(11,230		)	24,536
	Panel		1,650		(1,316		)	334		1,639		(1,073		)	566
	Panel		1,650		(1,316		)	334		1,639		(1,073		)	566
	Intellectual property		13,576		(3,999		)	9,577		13,571		(2,459		)	11,112
	Intellectual property		13,576		(3,999		)	9,577		13,571		(2,459		)	11,112
	Trade names		2,904		(2,604		)	300		4,153		(3,648		)	505
	Trade names		2,904		(2,604		)	300		4,153		(3,648		)	505
			$	61,674	$	(28,736	)	$	32,938	$	63,541	$	(22,782	)	$	40,759
			$	61,674	$	(28,736	)	$	32,938	$	63,541	$	(22,782	)	$	40,759
Weighted Average Remaining Amortization Period	'
	The weighted average remaining amortization period by major asset class as of December 31, 2013, is as follows:



		(In years)
	Acquired methodologies/technology	1.8
	Customer relationships	6
	Panel	1.4
	Intellectual property	7.5
	Trade names	1.5
Estimated Future Amortization of Acquired Intangible Assets	'
	The estimated future amortization of acquired intangible assets as of December 31, 2013 is as follows:



		(In thousands)
	2014	$	7,704
	2014	$	7,704
	2015	6,689
	2015	6,689
	2016	5,385
	2016	5,385
	2017	4,316
	2017	4,316
	2018	2,169
	2018	2,169
	Thereafter	6,675
	Thereafter	6,675
		$	32,938
		$	32,938

Accrued_Expenses_Tables

Accrued Expenses (Tables)	12 Months Ended
	Dec. 31, 2013
Accrued Liabilities [Abstract]	'
Schedule of Accrued Expenses	'
	Accrued expenses consist of the following:



		December 31,
		2013		2012
		(In thousands)

	Payroll and related	$	9,213	$	5,556

	Stock-based compensation	6,061		6,652

	Cost of revenues	5,641		4,892

	Income, sales and other taxes	4,716		2,733

	Professional fees	3,066		1,333

	Other	4,775		3,243

		$	33,472	$	24,409

LongTerm_Debt_and_Other_Financ1

Long-Term Debt and Other Financing Arrangement (Tables)	12 Months Ended
	Dec. 31, 2013
Long-term Debt and Capital Lease Obligations [Abstract]	'
Schedule of Future Minimum Lease Payments for Capital Leases	'
	Future minimum payments under capital leases with initial terms of one year or more are as follows:



		(In thousands)
	2014	$	11,254

	2015	9,133

	2016	4,652

	2017	58

	2018	—

	Total minimum lease payments	25,097

	Less amount representing interest	(1,416		)
	Present value of net minimum lease payments	23,681

	Less current portion	10,351

	Capital lease obligations, long-term	$	13,330

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Payments under Noncancelable Lease Agreements	'
	Future minimum payments under noncancelable lease agreements with initial terms of one year or more are as follows:



		(In thousands)
	2014	$	10,107

	2015	10,079

	2016	9,997

	2017	9,766

	2018	8,929

	Thereafter	28,637

	Total minimum lease payments	$	77,515

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Component of (Loss) Income Before Income Tax	'
	The components of (loss) income before income tax for the years ended December 31, 2013, 2012 and 2011 are as follows:



		2013				2012				2011
		(In thousands)
	Domestic	$	1,943			$	(6,350	)		$	(10,106	)

	Foreign	150				(3,065		)		(8,658		)

	Total	$	2,093			$	(9,415	)		$	(18,764	)

Income Tax (Benefit) Provision	'
	Income tax (benefit) provision is comprised of the following:



		Year Ended
		December 31,
		2013				2012				2011
		(In thousands)
	Current:
	Federal	$	152			$	(70	)		$	140

	State	373				114				182

	Foreign	1,520				1,434				1,060

	Total	2,045				1,478				1,382

	Deferred:
	Federal	3,518				1,278				(3,492		)

	State	392				(635		)		(832		)

	Foreign	(1,529		)		253				(32		)

	Total	2,381				896				(4,356		)

	Income tax (benefit) provision	$	4,426			$	2,374			$	(2,974	)

Effective Income Tax Rate Reconciliation	'
	A reconciliation of the statutory United States income tax rate to the effective income tax rate is as follows:



		Year Ended
		December 31,
		2013			2012			2011
	Statutory federal tax rate	35	%		35	%		35	%
	State taxes, net of federal benefit	23.8			3.6			2.3

	Nondeductible items	56.9			(15.5	)		(5.7	)

	Foreign rate differences	96.5			(2.9	)		(5.4	)

	Change in statutory tax rates	4.3			(0.9	)		(0.6	)

	Change in valuation allowance	(144.8	)		(10.6	)		(8.9	)
	Stock compensation shortfalls	41.2			(4.3	)		—

	True-ups and other adjustments	(5.7	)		(0.4	)		0.1

	Subpart F income recapture	96.3			—			—

	Market-based stock awards	—			(27.8	)		—

	Foreign tax withholding	4.3			(0.8	)		(0.6	)

	Uncertain tax positions	3.7			(0.6	)		(0.3	)

	Effective tax rate	211.5	%		(25.2	)%		15.9	%
Components of Net Deferred Income Taxes	'
	Significant components of the Company’s net deferred income taxes are as follows:



		December 31,
		2013				2012
		(In thousands)
	Deferred tax assets:
	Net operating loss carryforwards	$	6,658			$	13,352

	Capital loss carryforwards	778				769

	Tax credits	1,817				1,671

	Allowance for doubtful accounts	506				722

	Accrued salaries and benefits	724				256

	Deferred revenues	922				717

	Capital leases	8,955				4,853

	Deferred compensation	7,170				6,082

	Deferred rent	4,937				4,210

	Other	1,018				707

	Gross deferred tax assets	33,485				33,339

	Valuation allowance	(1,197		)		(4,045		)
	Net deferred tax assets	32,288				29,294

	Deferred tax liabilities:
	Intangible assets	(752		)		(1,535		)
	Property and equipment	(9,387		)		(5,577		)
	Subpart F income recapture	(2,310		)		—

	Prepaid maintenance	(317		)		(156		)
	Other	(81		)		(168		)
	Total deferred tax liabilities	(12,847		)		(7,436		)
	Net deferred tax asset	$	19,441			$	21,858

Deferred Tax Asset Valuation Allowance	'
	The following is a summary of activities in the deferred tax asset valuation allowance for the fiscal years indicated:



		December 31,
		2013				2012
		(In thousands)
	Deferred Tax Valuation Allowance
	Beginning Balance	$	(4,045	)		$	(2,741	)
	Additions	(132		)		(1,511		)
	Reductions	2,980				207

	Ending Balance	$	(1,197	)		$	(4,045	)
Unrecognized Income Tax Benefits	'
	The changes in the liability for unrecognized income tax benefits as of December 31, 2013, 2012 and 2011 resulted from the following:



		December 31,
		2013				2012				2011
		(In thousands)
	Unrecognized tax benefits beginning balance	$	1,418			$	1,386			$	2,376

	Increase related to tax positions of prior years	36				69				1

	Increase related to acquired tax positions recorded through purchase accounting	—				—				1

	Increase related to tax positions of the current year	45				4				17

	Decrease related to tax positions of prior years	(21		)		(27		)		(959		)
	Decrease due to settlements	(4		)		—				(42		)

	Decrease due to lapse in statutes of limitations	(31		)		(14		)		(8		)
	Unrecognized tax benefits ending balance	$	1,443			$	1,418			$	1,386

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Weighted-Average Assumptions	'
	A summary of the Plans is presented below:


			Number of		Weighted-			Weighted		Aggregate
			Shares		Average			Average		Intrinsic
					Exercise			Remaining		Value (in
					Price			Contractual		thousands)
								Term
								(in years)
	Options outstanding at December 31, 2012		90,552		$	4.38		2.99		$	851

	Options granted		—		$	—		—		—

	Options exercised		(52,063	)	$	4.37		—		$	1,028

	Options forfeited		—		$	—		—		—

	Options expired		(255	)	$	9.73		—		—

	Options outstanding and exercisable at December 31, 2013		38,234		$	4.37		2.09		$	927

Stock Option Activity	'
	A summary of the Plans is presented below:



			Number of		Weighted-
			shares		Average
					Exercise
					Price
	Options outstanding December 31, 2010		1,713,165		$	11.68

	Options granted		—		—

	Options exercised		(203,894	)	1.82

	Options forfeited		(82	)	9.29

	Options expired		(1,670	)	5.91

	Options outstanding December 31, 2011		1,507,519		13.02

	Options granted		—		—

	Options exercised		(367,234	)	0.65

	Options forfeited		(1,048,478	)	18.12

	Options expired		(1,255	)	2.79

	Options outstanding December 31, 2012		90,552		4.38

	Options granted		—		—

	Options exercised		(52,063	)	4.37

	Options forfeited		—		—

	Options expired		(255	)	9.73

	Options outstanding and exercisable at December 31, 2013		38,234		$	4.37

Options Outstanding Range of Exercise Price	'
	The following table summarizes information about options outstanding at December 31, 2013:



			Options Outstanding and Exercisable
	Range of Exercise Prices		Options		Weighted			Weighted
			Outstanding and Exercisable		Average			Average
					Exercise			Remaining
					Price			Contractual
								Life (Years)
	$0.25 - $4.25		16,482		$	2.7		1.63

	$4.26 - $7.50		17,248		$	4.74		2.14

	$7.51 - $13.66		4,504		$	9.05		3.57

			38,234		$	4.37		2.09

Nonvested Stock Awards	'
	A summary of the status for nonvested stock awards as of December 31, 2013 is presented as follows:



	Nonvested Stock Awards		Restricted		Restricted		Number of		Weighted
			Stock		Stock		Shares		Average
					Units		Underlying		Grant-
							Awards		Date Fair
									Value
	Nonvested at December 31, 2010		1,591,522		405,071		1,996,593		$	15.43

	Granted		681,674		243,983		925,657		25.39

	Vested		(751,873	)	(116,863	)	(868,736	)	16.01

	Forfeited		(135,903	)	(113,097	)	(249,000	)	19.02

	Nonvested at December 31, 2011		1,385,420		419,094		1,804,514		$	19.75

	Granted		1,706,900		445,368		2,152,268		20.84

	Vested		(888,707	)	(168,215	)	(1,056,922	)	18.81

	Forfeited		(233,903	)	(229,423	)	(463,326	)	21.34

	Nonvested at December 31, 2012		1,969,710		466,824		2,436,534		$	20.82

	Granted		484,052		1,025,065		1,509,117		19.95

	Vested		(1,196,792	)	(200,651	)	(1,397,443	)	17.91

	Forfeited		(206,360	)	(156,312	)	(362,672	)	20.71

	Nonvested at December 31, 2013		1,050,610		1,134,926		2,185,536		$	22.1

Shares Reserved for Issuance	'
	At December 31, 2013, the Company had reserved for future issuance the following shares of common stock upon the exercise of options and warrants:



	Common stock available for future issuances under the Plans	3,066,148

	Common stock reserved for outstanding options and restricted stock units	1,173,160

		4,239,308

Share_Repurchases_Tables

Share Repurchases (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Schedule of cash paid for share repurchases	'
	Cash paid for share repurchases during 2013, under the announced share repurchase program, was as follows:



	(Amounts in millions, except share and per share data)
	Total number of shares repurchased	483,437
	Average price paid per share	$27.12
	Total share repurchases	$13.10

Geographic_Information_Tables

Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segments, Geographical Areas [Abstract]	'
Schedule of Revenues Based on Customer Location	'
	The composition of the Company’s sales to unaffiliated customers between those in the United States and those in other locations for each year is set forth below:



		Year Ended December 31,
		2013		2012		2011
		(In thousands)
	United States	$	202,743	$	183,380	$	172,311

	Europe	49,480		43,456		35,797

	Canada	12,655		11,625		9,859

	Other	21,982		16,732		14,425

	Total Revenues	$	286,860	$	255,193	$	232,392

Schedule of Composition of the Company's Property and Equipment	'
	The composition of the Company’s property and equipment between those in the United States and those in other countries as of the end of each year is set forth below:



		December 31,
		2013		2012
		(In thousands)
	United States	$	32,370	$	24,810

	Europe	4,655		5,477

	Canada	256		291

	Other	714		840

	Total	$	37,995	$	31,418

Quarterly_Financial_Informatio1

Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of Quarterly Financial Information	'


			2013
			First				Second				Third				Fourth
			(In thousands, except share and per share data)
	Revenues		$	68,848			$	69,911			$	71,606			$	76,495

	Cost of revenues (1)		22,554				21,610				21,603				24,196

	Selling and marketing (1)		24,458				25,491				24,255				25,743

	Research and development (1)		10,223				9,803				10,441				10,558

	General and administrative (1)		9,012				11,238				12,492				13,707

	Amortization of intangible assets		2,151				1,936				1,956				1,914

	Gain on asset disposition		(210		)		—				(4		)		—

	Settlement of litigation		—				(1,160		)		—				(200		)

	Total expenses from operations		68,188				68,918				70,743				75,918

	Income from operations		660				993				863				577

	Interest and other (expense) income, net		(164		)		(168		)		(238		)		(368		)
	Gain (loss) from foreign currency transactions		(340		)		93				82				103

	Income before income taxes		156				918				707				312

	Provision for income taxes		(2,179		)		(1,316		)		(789		)		(142		)
	Net income (loss)		$	(2,023	)		$	(398	)		$	(82	)		$	170

	Net loss available to common stockholders per common share:
	Basic		$	(0.06	)		$	(0.01	)		$	—			$	—

	Diluted		$	(0.06	)		$	(0.01	)		$	—			$	—

	Weighted-average number of shares used in per share calculations:
	Basic		34,113,786				34,414,301				34,502,456				35,487,041

	Diluted		34,113,786				34,414,301				34,502,456				35,770,458


	(1) Amortization of stock-based compensation is included in the line items above as follows
	Cost of revenues		$	716			$	832			$	887			$	911

	Selling and marketing		2,813				3,219				2,487				2,543

	Research and development		614				602				947				858

	General and administrative		856				2,493				2,922				3,335




			2012
			First				Second				Third				Fourth
			(In thousands, except share and per share data)
	Revenues		$	62,275			$	60,291			$	64,273			$	68,354

	Cost of revenues (1)		20,401				20,371				21,933				23,674

Selling and marketing (1)		21,345				22,235				22,928				25,341

Research and development (1)		8,036				8,267				8,963				8,728

General and administrative (1)		9,106				9,725				9,400				9,903

Amortization of intangible assets		2,320				2,302				2,385				2,282

Impairment of intangible assets		—				3,349				—				—

Total expenses from operations		61,208				66,249				65,609				69,928

Income (loss) from operations		1,067				(5,958		)		(1,336		)		(1,574		)

Interest and other (expense) income, net		(198		)		(169		)		(174		)		(329		)
Gain (loss) from foreign currency transactions		(263		)		(304		)		(205		)		28

Income (loss) before income taxes		606				(6,431		)		(1,715		)		(1,875		)

Benefit (provision) for income taxes		(1,077		)		(156		)		(1,403		)		262

Net loss		$	(471	)		$	(6,587	)		$	(3,118	)		$	(1,613	)
Net loss available to common stockholders per common share:
Basic		$	(0.01	)		$	(0.20	)		$	(0.09	)		$	(0.05	)
Diluted		$	(0.01	)		$	(0.20	)		$	(0.09	)		$	(0.05	)
Weighted-average number of shares used in per share calculations:
Basic		32,889,119				33,189,994				33,470,628				33,705,129

Diluted		32,889,119				33,189,994				33,470,628				33,705,129


(1) Amortization of stock-based compensation is included in the line items above as follows
Cost of revenues		$	551			$	653			$	636			$	641

Selling and marketing		2,183				3,001				3,113				3,986

Research and development		405				485				504				525

General and administrative		1,951				2,200				1,911				2,151

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Narrative) (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of Significant Accounting Policies [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Impairment charges	'	'	'	'	'	'	'	'	$3,300,000	'	'
Percentage of holdings for consolidation	'	'	'	'	'	'	'	'	50.00%	'	'
Interest income on investments and excess cash balances nominal value	'	'	'	'	'	'	'	'	200,000	100,000	100,000
Impairment of intangible assets	'	'	'	'	0	0	3,349,000	0	0	3,349,000	0
Foreign Currency Transaction Gain (Loss), before Tax	103,000	82,000	93,000	-340,000	28,000	-205,000	-304,000	-263,000	-62,000	-744,000	-410,000
Revenue recognized under new revenue recognition guidance	'	'	'	'	'	'	'	'	'	2,400,000	'
Expense incurred under new revenue recognition guidance	'	'	'	'	'	'	'	'	'	1,400,000	'
Deferred revenue under the amended guidance	'	'	'	'	900,000	'	'	'	'	900,000	'
Deferred cost of revenue under the amended guidance	'	'	'	'	300,000	'	'	'	'	300,000	'
Revenue recognized in nonmonetary transactions	'	'	'	'	'	'	'	'	3,200,000	'	'
Revenue recognized related party	'	'	'	'	'	'	'	'	1,800,000	'	'
Expense related to nonmonetary transactions	'	'	'	'	'	'	'	'	1,800,000	'	'
Percentage of revenue accounted for account receivables	10.00%	'	'	'	10.00%	'	'	'	10.00%	10.00%	'
Advertising expense	'	'	'	'	'	'	'	'	$200,000	$100,000	$100,000
Dilutive effect of stock options and restricted shares	'	'	'	'	'	'	'	'	688,659	1,547,077	627,147
Minimum [Member]	'	'	'	'	'	'	'	'	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Property and equipment, estimated useful life, maximum (in years)	'	'	'	'	'	'	'	'	'3 years	'	'
Revenue recognition period	'	'	'	'	'	'	'	'	'3 months	'	'
Maximum [Member]	'	'	'	'	'	'	'	'	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Property and equipment, estimated useful life, maximum (in years)	'	'	'	'	'	'	'	'	'5 years	'	'
Revenue recognition period	'	'	'	'	'	'	'	'	'24 months	'	'
Service Arrangements [Member] \| Minimum [Member]	'	'	'	'	'	'	'	'	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue recognition period	'	'	'	'	'	'	'	'	'2 months	'	'
Service Arrangements [Member] \| Maximum [Member]	'	'	'	'	'	'	'	'	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue recognition period	'	'	'	'	'	'	'	'	'1 year	'	'
Microsoft [Member]	'	'	'	'	'	'	'	'	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Percentage of revenue accounted for by customer	'	'	'	'	'	'	'	'	7.00%	8.00%	10.00%

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Schedule of Measured At Fair Value On Non-recurring Basis) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Long-lived assets held and used	$1,182	$2,500
Total Gains (Losses)	0	-3,349
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Long-lived assets held and used	1,182	'
Total Gains (Losses)	'	$2,500

Summary_of_Significant_Account5

Summary of Significant Accounting Policies (Schedule of Allowance For Doubtful Accounts) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]	'	'	'
Beginning Balance	($1,117)	($903)	($725)
Additions	-1,248	-1,429	-220
Reductions, (recoveries) and write-offs	698	1,215	42
Ending Balance	($1,667)	($1,117)	($903)

Summary_of_Significant_Account6

Summary of Significant Accounting Policies (Schedule of Useful Lives of Finite Lived Intangible Assets) (Detail)	0 Months Ended	12 Months Ended
	Mar. 18, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
		Acquired methodologies/technology [Member]	Acquired methodologies/technology [Member]	Customer relationships [Member]	Customer relationships [Member]	Panel [Member]	Intellectual property [Member]	Intellectual property [Member]	Trade names [Member]	Trade names [Member]
		Minimum [Member]	Maximum [Member]	Minimum [Member]	Maximum [Member]		Minimum [Member]	Maximum [Member]	Minimum [Member]	Maximum [Member]
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'	'	'	'	'	'
Finite-lived intangible assets useful life (in years)	'3 years	'3 years	'10 years	'3 years	'12 years	'7 years	'7 years	'13 years	'2 years	'10 years

Summary_of_Significant_Account7

Summary of Significant Accounting Policies (Schedule of Computing Basic and Diluted Net (Loss) Income Per Common Share) (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net loss	$170	($82)	($398)	($2,023)	($1,613)	($3,118)	($6,587)	($471)	($2,333)	($11,789)	($15,790)
Net income per share - common stock: Basic (in dollars per share)	$0	$0	($0.01)	($0.06)	($0.05)	($0.09)	($0.20)	($0.01)	($0.07)	($0.35)	($0.49)
Net income per share - common stock: Diluted (in dollars per share)	$0	$0	($0.01)	($0.06)	($0.05)	($0.09)	($0.20)	($0.01)	($0.07)	($0.35)	($0.49)
Weighted-average shares outstanding-common stock, basic	35,487,041	34,502,456	34,414,301	34,113,786	33,705,129	33,470,628	33,189,994	32,889,119	34,443,126	33,244,798	32,289,877
Options to purchase common stock	'	'	'	'	'	'	'	'	0	0	0
Unvested restricted stock units	'	'	'	'	'	'	'	'	0	0	0
Warrants to purchase common stock	'	'	'	'	'	'	'	'	0	0	0
Weighted-average shares outstanding-common stock, diluted	35,770,458	34,502,456	34,414,301	34,113,786	33,705,129	33,470,628	33,189,994	32,889,119	34,443,126	33,244,798	32,289,877

Business_Combinations_Narrativ

Business Combinations (Narrative) (Detail) (USD $)

0 Months Ended

4 Months Ended

12 Months Ended

5 Months Ended

12 Months Ended

5 Months Ended

In Millions, except Share data, unless otherwise specified

Mar. 18, 2013

Dec. 20, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Aug. 11, 2011

Dec. 31, 2011

Aug. 11, 2010

Dec. 31, 2013

Dec. 31, 2011

Aug. 11, 2011

Dec. 31, 2013

Dec. 31, 2011

Aug. 11, 2011

Dec. 31, 2011

Aug. 11, 2011

Adxpose Inc [Member]

Customer relationships [Member]

Trade names [Member]

Developed Technology [Member]

Minimum [Member]

Maximum [Member]

Adxpose Inc [Member]

Minimum [Member]

Maximum [Member]

Adxpose Inc [Member]

Business Acquisition [Line Items]

Transaction related costs

$0.70

Acquisition resulted in goodwill

Total purchase price

19.4

Finite-lived intangible assets

0.9

0.1

0.7

Finite-lived intangible assets useful life (in years)

'3 years

'12 years

'3 years

'2 years

'10 years

'1 year 6 months

'5 years

Revenue related to acquiree

1.5

Cash paid to acquired entity

4.4

Number of shares issued as consideration

974,358

982,285

Value of shares issued as consideration

$15

Asset_Disposition_Details

Asset Disposition (Details) (USD $)	0 Months Ended	3 Months Ended				12 Months Ended
Asset Disposition (Details) (USD $)	Mar. 18, 2013	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Asset Disposition [Abstract]	'	'	'	'	'	'	'	'
Percentage of discount rate	18.50%	'	'	'	'	'	'	'
Percentage of royalty rate	3.00%	'	'	'	'	'	'	'
Finite-lived intangible assets useful life (in years)	'3 years	'	'	'	'	'	'	'
Proceeds from Divestiture of Businesses	$1,000,000	'	'	'	'	'	'	'
Proceeds from Divestiture of Businesses	'	'	'	'	160,000	'	'	'
Proceeds Held In Escrow	'	'	'	'	750,000	'	'	'
ARS Intangible Asset	'	'	'	'	1,182,000	'	'	'
Total Asset Disposition Fair Value	'	'	'	'	2,092,000	'	'	'
Assets of Disposal Group, Including Discontinued Operation	'	'	'	'	-1,436,000	'	'	'
Goodwill Allocated To ARS	'	-289,000	'	'	-289,000	-289,000	'	'
FV Accelerated Equity Awards	'	'	'	'	-157,000	'	'	'
Gain on disposition	'	$0	$4,000	$0	$210,000	$214,000	$0	$0

Property_and_Equipment_Narrati

Property and Equipment (Narrative) (Detail) (USD $)	12 Months Ended
Property and Equipment (Narrative) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]	'	'	'
Property, plant and equipment, lease rent capitalized	$2,300,000	$1,300,000	'
Depreciation expense	$16,777,000	$14,159,000	$13,352,000

Property_and_Equipment_Capital

Property and Equipment (Capital Lease Obligations) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$89,022	$70,361
Less: accumulated depreciation and amortization	-51,027	-38,943
Property and equipment, net	37,995	31,418
Capital leases	41,321	24,242
Accumulated depreciation, capital leases	21,066	11,982
Computer equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	60,673	39,570
Computer software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	5,764	10,773
Office equipment and furniture [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	5,156	4,570
Automobiles [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	1,644	1,329
Leasehold improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$15,785	$14,119

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Carrying Value of Goodwill) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Goodwill [Roll Forward]	'	'
Balance as of December 31, 2012	$102,900	'
Goodwill allocated to ARS disposition	-289	-289
Translation adjustments	703	'
Balance as of December 31, 2013	$103,314	'

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets (Narrative) (Detail) (USD $)

0 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

Mar. 18, 2013

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Goodwill [Line Items]

Goodwill allocated to ARS disposition

$289,000

Percentage of discount rate

18.50%

Percentage of royalty rate

3.00%

Estimated fair value of intangible assets

2,500,000

Impairment of intangible assets

3,349,000

Income from continuing operations and net income

3,300,000

Impact on earnings per share (in dollars per share)

$0.10

Estimated useful life, intangible assets (in months)

'18 months

Amortization of intangible assets

1,914,000

1,956,000

1,936,000

2,151,000

2,282,000

2,385,000

2,302,000

2,320,000

7,957,000

9,289,000

9,301,000

Amount allocated to acquired patents

$11,000,000

ARS group [Member]

Goodwill [Line Items]

Percentage of discount rate

18.50%

Percentage of royalty rate

3.00%

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets (Schedule of Acquired Intangible Assets) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]	'	'
Gross Carrying Amount	$61,674	$63,541
Accumulated Amortization	-28,736	-22,782
Net Carrying Amount	32,938	40,759
Acquired methodologies/technology [Member]	'	'
Goodwill [Line Items]	'	'
Gross Carrying Amount	7,770	8,412
Accumulated Amortization	-5,471	-4,372
Net Carrying Amount	2,299	4,040
Customer relationships [Member]	'	'
Goodwill [Line Items]	'	'
Gross Carrying Amount	35,774	35,766
Accumulated Amortization	-15,346	-11,230
Net Carrying Amount	20,428	24,536
Panel [Member]	'	'
Goodwill [Line Items]	'	'
Gross Carrying Amount	1,650	1,639
Accumulated Amortization	-1,316	-1,073
Net Carrying Amount	334	566
Intellectual property [Member]	'	'
Goodwill [Line Items]	'	'
Gross Carrying Amount	13,576	13,571
Accumulated Amortization	-3,999	-2,459
Net Carrying Amount	9,577	11,112
Trade names [Member]	'	'
Goodwill [Line Items]	'	'
Gross Carrying Amount	2,904	4,153
Accumulated Amortization	-2,604	-3,648
Net Carrying Amount	$300	$505

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets (Weighted Average Remaining Amortization Period) (Detail)	12 Months Ended
	Dec. 31, 2013
Acquired methodologies/technology [Member]	'
Intangible Assets [Line Items]	'
Weighted average remaining amortization period	'1 year 9 months 18 days
Customer relationships [Member]	'
Intangible Assets [Line Items]	'
Weighted average remaining amortization period	'6 years
Panel [Member]	'
Intangible Assets [Line Items]	'
Weighted average remaining amortization period	'1 year 4 months 24 days
Intellectual property [Member]	'
Intangible Assets [Line Items]	'
Weighted average remaining amortization period	'7 years 6 months
Trade names [Member]	'
Intangible Assets [Line Items]	'
Weighted average remaining amortization period	'1 year 6 months

Goodwill_and_Intangible_Assets6

Goodwill and Intangible Assets (Estimated Future Amortization of Acquired Intangible Assets) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]	'	'
2014	$7,704	'
2015	6,689	'
2016	5,385	'
2017	4,316	'
2018	2,169	'
Thereafter	6,675	'
Net Carrying Amount	$32,938	$40,759

Accrued_Expenses_Schedule_of_A

Accrued Expenses (Schedule of Accrued Expenses) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued Liabilities [Abstract]	'	'
Payroll and related	$9,213	$5,556
Cost of revenues	5,641	4,892
Stock-based compensation	6,061	6,652
Other	4,775	3,243
Income, sales and other taxes	4,716	2,733
Professional fees	3,066	1,333
Total accrued expenses	$33,472	$24,409

LongTerm_Debt_and_Other_Financ2

Long-Term Debt and Other Financing Arrangement (Narrative) (Detail) (USD $)

12 Months Ended

0 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Sep. 26, 2013

Computer equipment [Member]

Revolving Credit Facility [Member]

Standby Letters of Credit [Member]

Swing Line [Member]

Alternative Currency Lending [Member]

Fed Funds Rate [Member]

Eurocurrency Rate [Member]

Applicable Rate [Member]

Line of Credit [Member]

Revolving Credit Facility [Member]

Base Rate and Swing Lines [Member]

Eurocurrency Rate Loan [Member]

Bank of America [Member]

Line of Credit [Member]

Bank of America [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Schedule of Capitalization, Long-term Debt [Line Items]

Capital lease obligations

$10

Utilization of capital lease

8.6

Asset acquired through issuance of capital leases

14.4

7.8

5.4

Revolving credit facility, maximum borrowing capacity

100

Letters of credit outstanding

Line of credit facility additional borrowings available

Line of Credit Facility, Higher Borrowing Capacity Option

Line of Credit Facility, Maximum Borrowing Capacity Over Five Year Term

$50

Debt Instrument, Basis Spread on Variable Rate

0.50%

1.00%

0.50%

1.50%

2.50%

Line of Credit Facility, Commitment Fee Percentage

0.20%

0.35%

LongTerm_Debt_and_Other_Financ3

Long-Term Debt and Other Financing Arrangement (Schedule of Future Minimum Payments for Capital Leases) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Long-term Debt and Capital Lease Obligations [Abstract]	'	'
2014	$11,254	'
2015	9,133	'
2016	4,652	'
2017	58	'
2018	0	'
Total minimum lease payments	25,097	'
Less amount representing interest	-1,416	'
Present value of net minimum lease payments	23,681	'
Less current portion	10,351	8,020
Capital lease obligations, long-term	$13,330	$6,478

Commitments_and_Contingencies_1

Commitments and Contingencies (Narrative) (Detail) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended			3 Months Ended		1 Months Ended
	Dec. 20, 2011	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2012	Jun. 30, 2013
	Dec. 20, 2011	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Patents [Member]	Patents [Member]	Patent Litigation [Member]
Commitments And Contingencies [Line Items]	'	'	'	'	'	'	'	'
Total rent expense, under non-cancellable operating leases	'	$8,900,000	$8,400,000	'	$6,700,000	'	'	'
Deferred rent and capitalized assets	'	'	2,300,000	1,300,000	'	'	'	'
Number of shares issued under patent purchase	974,358	'	'	'	'	'	'	'
Restricted common stock	'	'	'	16,200,000	'	'	'	'
Amount allocated to acquired patents	'	'	11,000,000	11,000,000	'	'	26,000,000	'
Amount allocated to litigation settlement	'	'	'	5,200,000	'	12,200,000	'	'
Percentage of acquired patents	'	'	'	50.00%	'	'	'	'
Date of patents amortized	'	'	'	'July 2018	'	'	'	'
Percentage of acquired patents in different period	'	'	'	50.00%	'	'	'	'
Date of patents amortized in different period	'	'	'	'September 2024	'	'	'	'
Settlement of litigation	'	'	$1,360,000	$0	($5,175,000)	'	'	$1,400,000

Commitments_and_Contingencies_2

Commitments and Contingencies (Schedule of Future Minimum Payments under Noncancelable Lease Agreements) (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
2014	$10,107
2015	10,079
2016	9,997
2017	9,766
2018	8,929
Thereafter	28,637
Total minimum lease payments	$77,515

Income_Taxes_Narrative_Detail

Income Taxes (Narrative) (Detail) (USD $)

3 Months Ended

12 Months Ended

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Income Taxes [Line Items]

Benefit (provision) for income taxes

($142,000)

($789,000)

($1,316,000)

($2,179,000)

$262,000

($1,403,000)

($156,000)

($1,077,000)

($4,426,000)

($2,374,000)

$2,974,000

Current federal alternative minimum tax and state income tax liabilities

500,000

100,000

300,000

Current foreign income tax expense

1,520,000

1,434,000

1,060,000

Federal statutory rate

35.00%

Deferred tax assets, valuation allowance

1,197,000

4,045,000

1,197,000

4,045,000

2,741,000

Increase in deferred tax assets valuation allowance

100,000

200,000

Net deferred tax asset

19,441,000

21,858,000

19,441,000

21,858,000

Operating loss carryforwards

32,500,000

28,900,000

32,500,000

28,900,000

Alternative minimum tax credit carryforwards

1,500,000

Research and development credit carryforwards

700,000

Excess tax benefits from stock based compensation, net

-51,000

103,000

Undistributed foreign earnings

6,500,000

Unrecognized tax benefits

1,443,000

1,418,000

1,443,000

1,418,000

1,386,000

2,376,000

Unrecognized tax benefits to be reversed in next year due to filing of related tax returns and expiration of statute of limitations

100,000

Accrued interest expense on unrecognized tax benefits

700,000

Deferred tax (benefit) provision

-2,381,000

-896,000

4,356,000

Write off of deferred tax asset

2,300,000

2,600,000

Deferred income tax liability to be recognized in future years related to subpart F income

2,900,000

Foreign [Member]

Income Taxes [Line Items]

Benefit (provision) for income taxes

-1,100,000

Deferred tax assets, valuation allowance

100,000

Increase in deferred tax assets valuation allowance

2,900,000

1,200,000

Operating loss carryforwards

20,800,000

Federal [Member]

Income Taxes [Line Items]

Operating loss carryforwards

37,200,000

46,800,000

37,200,000

46,800,000

State [Member]

Income Taxes [Line Items]

Deferred tax assets, valuation allowance

300,000

Operating loss carryforwards

38,300,000

43,100,000

38,300,000

43,100,000

State and Foreign [Member]

Income Taxes [Line Items]

Excess tax benefits from stock based compensation, net

100,000

Additional Paid-in Capital [Member]

Income Taxes [Line Items]

Excess tax benefits from stock based compensation, net

-51,000

103,000

Changes In Excess Tax Benefit From Share Based Compensation Financing Activities

$900,000

$200,000

Income_Taxes_Component_Of_Loss

Income Taxes (Component Of (Loss) Income Before Income Tax) (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Domestic	'	'	'	'	'	'	'	'	$1,943	($6,350)	($10,106)
Foreign	'	'	'	'	'	'	'	'	150	-3,065	-8,658
Income (loss) before income tax benefit (provision)	$312	$707	$918	$156	($1,875)	($1,715)	($6,431)	$606	$2,093	($9,415)	($18,764)

Income_Taxes_Income_Tax_Benefi

Income Taxes (Income Tax (Benefit) Provision) (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Current, Federal	'	'	'	'	'	'	'	'	$152	($70)	$140
Current, State	'	'	'	'	'	'	'	'	373	114	182
Current, Foreign	'	'	'	'	'	'	'	'	1,520	1,434	1,060
Current Total	'	'	'	'	'	'	'	'	2,045	1,478	1,382
Deferred, Federal	'	'	'	'	'	'	'	'	3,518	1,278	-3,492
Deferred, State	'	'	'	'	'	'	'	'	392	-635	-832
Deferred, Foreign	'	'	'	'	'	'	'	'	-1,529	253	-32
Deferred Total	'	'	'	'	'	'	'	'	2,381	896	-4,356
Income tax (benefit) provision	$142	$789	$1,316	$2,179	($262)	$1,403	$156	$1,077	$4,426	$2,374	($2,974)

Income_Taxes_Effective_Income_

Income Taxes (Effective Income Tax Rate Reconciliation) (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Statutory federal tax rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	23.80%	3.60%	2.30%
Nondeductible items	56.90%	-15.50%	-5.70%
Foreign rate differences	96.50%	-2.90%	-5.40%
Change in statutory tax rates	4.30%	-0.90%	-0.60%
Change in valuation allowance	-144.80%	-10.60%	-8.90%
Stock compensation shortfalls	41.20%	-4.30%	0.00%
True-ups and other adjustments	-5.70%	-0.40%	0.10%
Effective Income Tax Rate Reconciliation, Subpart F Income Recapture	96.30%	0.00%	0.00%
Market-based stock awards	0.00%	-27.80%	0.00%
Foreign tax withholding	4.30%	-0.80%	-0.60%
Uncertain tax positions	3.70%	-0.60%	-0.30%
Effective tax rate	211.50%	-25.20%	15.90%

Income_Taxes_Components_of_Net

Income Taxes (Components of Net Deferred Income Taxes) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Net operating loss carryforwards	$6,658	$13,352	'
Capital loss carryforwards	778	769	'
Tax credits	1,817	1,671	'
Allowance for doubtful accounts	506	722	'
Accrued salaries and benefits	724	256	'
Deferred revenues	922	717	'
Capital leases	8,955	4,853	'
Deferred compensation	7,170	6,082	'
Deferred rent	4,937	4,210	'
Other	1,018	707	'
Gross deferred tax assets	33,485	33,339	'
Valuation allowance	-1,197	-4,045	-2,741
Net deferred tax assets	32,288	29,294	'
Intangible assets	-752	-1,535	'
Property and equipment	-9,387	-5,577	'
Subpart F income recapture	-2,310	0	'
Prepaid maintenance	-317	-156	'
Other	-81	-168	'
Total deferred tax liabilities	-12,847	-7,436	'
Net deferred tax asset	$19,441	$21,858	'

Income_Taxes_Deferred_Tax_Asse

Income Taxes (Deferred Tax Asset Valuation Allowance) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]	'	'
Beginning Balance	($4,045)	($2,741)
Additions	-132	-1,511
Reductions	2,980	207
Ending Balance	($1,197)	($4,045)

Income_Taxes_Unrecognized_Inco

Income Taxes (Unrecognized Income Tax Benefits) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Unrecognized tax benefits beginning balance	$1,418	$1,386	$2,376
Increase related to tax positions of prior years	36	69	1
Increase related to acquired tax positions recorded through purchase accounting	0	0	1
Increase related to tax positions of the current year	45	4	17
Decrease related to tax positions of prior years	-21	-27	-959
Decrease due to settlements	-4	0	-42
Decrease due to lapse in statutes of limitations	-31	-14	-8
Unrecognized tax benefits ending balance	$1,443	$1,418	$1,386

Stockholders_Equity_Narrative_

Stockholders' Equity (Narrative) (Detail) (USD $)

0 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

Dec. 20, 2011

Dec. 31, 2013

Sep. 30, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Aug. 11, 2011

Sep. 30, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Sep. 30, 2012

Dec. 31, 2013

Sep. 30, 2012

Adxpose Inc [Member]

Upon Achievement Of 100%[Member]

Upon Achievement Of 200%[Member]

Chief Executive Officer [Member]

Executive Management [Member]

1999 Stock Option Plan And 2007 Equity Incentive Plan [Member]

2007 Equity Incentive Plan [Member]

Restricted Stock [Member]

Time Based Restricted Stock Awards [Member]

Restricted Stock And Restricted Stock Units [Member]

Chief Executive Officer [Member]

Executive Management [Member]

Chief Executive Officer [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares authorized (in shares)

1,800,000

9,900,000

8,500,000

Percentage common stock outstanding shares

4.00%

Vesting period of options granted, in years

'4 years

'3 years

'4 years

'3 years

Options expiration period from date of grant, in years

'10 years

Increase in number of shares available for grant (in shares)

1,427,177

Shares available for grant (in shares)

3,066,148

Number of shares eligible to vest for three years (in shares)

1,509,117

2,152,268

925,657

290,000

484,052

1,706,900

681,674

210,000

380,000

580,000

Number of shares eligible to vest for three years (in shares)

580,000

Weighted percentage of revenue and adjusted EDITDA goals

50.00%

Target Performance Metric, Percentage

100.00%

200.00%

Number of shares eligible to vest for given years (in shares)

96,666

193,334

Aggregate intrinsic value of options exercised

$1,028,000

$5,000,000

$3,600,000

Aggregate intrinsic value of options outstanding

927,000

851,000

Option Outstanding, Weighted Average Remaining Contractual Life (Years)

'2 years 1 month 2 days

Weighted-average remaining contractual term for options outstanding (in years)

'2 years 1 month 2 days

'2 years 11 months 27 days

Right of repurchase of shares awarded, lapse rate

-25.00%

Restricted stock forfeited (in shares)

206,360

Aggregate intrinsic value for non-vested shares

62,500,000

Weighted average remaining contractual term for non-vested shares (in years)

'1 year 1 month 6 days

Weighted-average period expected to recognize compensation expense (in years)

'1 year 2 months 5 days

Total unrecognized compensation expense

27,100,000

Restricted stock units vested (in shares)

1,397,443

1,056,922

868,736

1,196,792

888,707

751,873

Repurchase of common stock (in shares)

483,437

510,328

Aggregate purchase price of shares repurchased

$9,300,000

Common stock outstanding (in shares)

24,375

Common stock issued for warrant exercised (in shares)

19,895

Number of shares issued as consideration

974,358

982,285

Stockholders_Equity_Stock_Opti

Stockholders' Equity (Stock Option Activity) (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'	'	'
Number of Shares, Options outstanding beginning balance (in shares)	90,552	1,507,519	1,713,165
Number of Shares, Options granted (in shares)	0	0	0
Number of Shares, Options exercised (in shares)	-52,063	-367,234	-203,894
Number of Shares, Options forfeited (in shares)	0	-1,048,478	-82
Number of Shares, Options expired (in shares)	-255	-1,255	-1,670
Number of Shares, Options outstanding ending balance (in shares)	38,234	90,552	1,507,519
Weighted-average remaining contractual term for options outstanding (in years)	'2 years 1 month 2 days	'2 years 11 months 27 days	'
Aggregate intrinsic value of options outstanding, Beginning Balance	$851	'	'
Aggregate intrinsic value of options exercised	1,028	5,000	3,600
Aggregate intrinsic value of options outstanding, Ending Balance	$927	$851	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]	'	'	'
Weighted-Average Exercise Price, Options outstanding beginning balance (in dollars per share)	$4.38	$13.02	$11.68
Weighted-Average Exercise Price, Options granted (in dollars per share)	$0	$0	$0
Weighted-Average Exercise Price, Options exercised (in dollars per share)	$4.37	$0.65	$1.82
Weighted-Average Exercise Price, Options forfeited (in dollars per share)	$0	$18.12	$9.29
Weighted-Average Exercise Price, Options expired (in dollars per share)	$9.73	$2.79	$5.91
Weighted-Average Exercise Price, Options outstanding ending balance (in dollars per share)	$4.37	$4.38	$13.02

Stockholders_Equity_Option_Out

Stockholders' Equity (Option Outstanding Range of Exercise Price) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Option Outstanding, Numbers	38,234
Option Outstanding, Weighted Average Exercise Price	$4.37
Option Outstanding, Weighted Average Remaining Contractual Life (Years)	'2 years 1 month 2 days
$.25 - $2.50 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$4.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$0.25
Option Outstanding, Numbers	16,482
Option Outstanding, Weighted Average Exercise Price	$2.70
Option Outstanding, Weighted Average Remaining Contractual Life (Years)	'1 year 7 months 17 days
$4.26 - $7.50 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$7.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$4.26
Option Outstanding, Numbers	17,248
Option Outstanding, Weighted Average Exercise Price	$4.74
Option Outstanding, Weighted Average Remaining Contractual Life (Years)	'2 years 1 month 21 days
$2.51 - $13.66 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$13.66
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$7.51
Option Outstanding, Numbers	4,504
Option Outstanding, Weighted Average Exercise Price	$9.05
Option Outstanding, Weighted Average Remaining Contractual Life (Years)	'3 years 6 months 26 days

Stockholders_Equity_Nonvested_

Stockholders' Equity (Nonvested Stock Awards) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]	'	'	'
Nonvested Stock Awards, Beginning balance (in shares)	2,436,534	1,804,514	1,996,593
Nonvested Stock Awards, Shares Granted (in shares)	1,509,117	2,152,268	925,657
Nonvested Stock Awards, Shares Vested (in shares)	-1,397,443	-1,056,922	-868,736
Nonvested Stock Awards, Shares Forfeited (in shares)	-362,672	-463,326	-249,000
Nonvested Stock Awards Shares, Ending balance (in shares)	2,185,536	2,436,534	1,804,514
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Weighted Average Grant-Date Fair Value, Beginning balance (in dollars per share)	$20.82	$19.75	$15.43
Weighted Average Grant-Date Fair Value, Granted (in dollars per share)	$19.95	$20.84	$25.39
Weighted Average Grant-Date Fair Value, Vested (in dollars per share)	$17.91	$18.81	$16.01
Weighted Average Grant-Date Fair Value, Forfeited (in dollars per share)	$20.71	$21.34	$19.02
Weighted Average Grant-Date Fair Value, Ending balance (in dollars per share)	$22.10	$20.82	$19.75
Restricted Stock [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]	'	'	'
Nonvested Stock Awards, Beginning balance (in shares)	1,969,710	1,385,420	1,591,522
Nonvested Stock Awards, Shares Granted (in shares)	484,052	1,706,900	681,674
Nonvested Stock Awards, Shares Vested (in shares)	-1,196,792	-888,707	-751,873
Nonvested Stock Awards, Shares Forfeited (in shares)	-206,360	-233,903	-135,903
Nonvested Stock Awards Shares, Ending balance (in shares)	1,050,610	1,969,710	1,385,420
Restricted Stock Unit [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]	'	'	'
Nonvested Stock Awards, Beginning balance (in shares)	466,824	419,094	405,071
Nonvested Stock Awards, Shares Granted (in shares)	1,025,065	445,368	243,983
Nonvested Stock Awards, Shares Vested (in shares)	-200,651	-168,215	-116,863
Nonvested Stock Awards, Shares Forfeited (in shares)	-156,312	-229,423	-113,097
Nonvested Stock Awards Shares, Ending balance (in shares)	1,134,926	466,824	419,094

Stockholders_Equity_Shares_Res

Stockholders' Equity (Shares Reserved for Issuance) (Detail)	Dec. 31, 2013
Schedule Of Stock Options [Line Items]	'
Common stock reserved for future issuance	4,239,308
Stock Under Plans [Member]	'
Schedule Of Stock Options [Line Items]	'
Common stock reserved for future issuance	3,066,148
Stock Options And Restricted Stock Units [Member]	'
Schedule Of Stock Options [Line Items]	'
Common stock reserved for future issuance	1,173,160

Share_Repurchases_Details

Share Repurchases (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 03, 2013
Equity [Abstract]	'	'	'	'	'
Stock authorized for repurchase	'	'	'	'	50,000,000
Total number of shares repurchased	483,437	'	'	'	'
Average price paid per share	$27.12	'	'	'	'
Total share repurchases	$13,100	$13,109	$0	$0	'

Employee_Benefit_Plans_Detail

Employee Benefit Plans (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]	'	'	'
Employer contributions	$0.50	$0.50	$0.40

Geographic_Information_Detail

Geographic Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Geographical Information [Line Items]	'	'	'
Total Revenues	$286,860	$255,193	$232,392
Property and equipment, net	37,995	31,418	'
United States [Member]	'	'	'
Schedule Of Geographical Information [Line Items]	'	'	'
Total Revenues	202,743	183,380	172,311
Property and equipment, net	32,370	24,810	'
Europe [Member]	'	'	'
Schedule Of Geographical Information [Line Items]	'	'	'
Total Revenues	49,480	43,456	35,797
Property and equipment, net	4,655	5,477	'
Canada [Member]	'	'	'
Schedule Of Geographical Information [Line Items]	'	'	'
Total Revenues	12,655	11,625	9,859
Property and equipment, net	256	291	'
Other [Member]	'	'	'
Schedule Of Geographical Information [Line Items]	'	'	'
Total Revenues	21,982	16,732	14,425
Property and equipment, net	$714	$840	'

Quarterly_Financial_Informatio2

Quarterly Financial Information (Schedule Of Quarterly Financial Information) (Detail) (USD $)	3 Months Ended												12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]	'	'	'	'	'		'		'		'		'		'		'
Revenues	$76,495	$71,606	$69,911	$68,848	$68,354		$64,273		$60,291		$62,275		$286,860		$255,193		$232,392
Cost of revenues	24,196	21,603	21,610	22,554	23,674	[1]	21,933	[1]	20,371	[1]	20,401	[1]	89,963	[2]	86,379	[2]	75,103	[2]
Selling and marketing	25,743	24,255	25,491	24,458	25,341	[1]	22,928	[1]	22,235	[1]	21,345	[1]	99,947	[2]	91,849	[2]	78,289	[2]
Research and development	10,558	10,441	9,803	10,223	8,728	[1]	8,963	[1]	8,267	[1]	8,036	[1]	41,025	[2]	33,994	[2]	34,050	[2]
General and administrative	13,707	12,492	11,238	9,012	9,903	[1]	9,400	[1]	9,725	[1]	9,106	[1]	46,449	[2]	38,134	[2]	48,514	[2]
Amortization of intangible assets	1,914	1,956	1,936	2,151	2,282		2,385		2,302		2,320		7,957		9,289		9,301
Impairment of intangible assets	'	'	'	'	0		0		3,349		0		0		3,349		0
Gain on asset disposition	0	-4	0	-210	'		'		'		'		-214		0		0
Settlement of litigation	-200	0	-1,160	0	'		'		'		'		0		0		-5,175
Total expenses from operations	75,918	70,743	68,918	68,188	69,928		65,609		66,249		61,208		283,767		262,994		250,432
Loss from operations	577	863	993	660	-1,574		-1,336		-5,958		1,067		3,093		-7,801		-18,040
Interest and other (expense) income, net	-368	-238	-168	-164	-329		-174		-169		-198		-938		-870		-525
Gain (loss) from foreign currency transactions	103	82	93	-340	28		-205		-304		-263		-62		-744		-410
Gain on sale of marketable securities	'	'	'	'	'		'		'		'		0		0		211
Loss before income taxes	312	707	918	156	-1,875		-1,715		-6,431		606		2,093		-9,415		-18,764
Benefit (provision) for income taxes	-142	-789	-1,316	-2,179	262		-1,403		-156		-1,077		-4,426		-2,374		2,974
Net loss	$170	($82)	($398)	($2,023)	($1,613)		($3,118)		($6,587)		($471)		($2,333)		($11,789)		($15,790)
Net loss available to common stockholders per common share:	'	'	'	'	'		'		'		'		'		'		'
Basic (in dollars per share)	$0	$0	($0.01)	($0.06)	($0.05)		($0.09)		($0.20)		($0.01)		($0.07)		($0.35)		($0.49)
Diluted (in dollars per share)	$0	$0	($0.01)	($0.06)	($0.05)		($0.09)		($0.20)		($0.01)		($0.07)		($0.35)		($0.49)
Weighted-average number of shares used in per share calculations:	'	'	'	'	'		'		'		'		'		'		'
Basic (in shares)	35,487,041	34,502,456	34,414,301	34,113,786	33,705,129		33,470,628		33,189,994		32,889,119		34,443,126		33,244,798		32,289,877
Diluted (in shares)	35,770,458	34,502,456	34,414,301	34,113,786	33,705,129		33,470,628		33,189,994		32,889,119		34,443,126		33,244,798		32,289,877

[1]	Amortization of stock-based compensation is included in the line items above as follows
[2]	Amortization of stock-based compensation is included in the line items above as follows Cost of revenues $3,346 $2,481 $1,976 Selling and marketing $11,062 $12,283 $8,512 Research and development $3,021 $1,919 $1,988 General and administrative $9,606 $8,213 $8,784

Quarterly_Financial_Informatio3

Quarterly Financial Information (Amortization Of Stock-Based Compensation) (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cost of revenues [Member]	'	'	'	'	'	'	'	'	'	'	'
Quarterly Financial Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Allocated Share-based Compensation Expense	$911	$887	$832	$716	$641	$636	$653	$551	$3,346	$2,481	$1,976
Selling and marketing [Member]	'	'	'	'	'	'	'	'	'	'	'
Quarterly Financial Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Allocated Share-based Compensation Expense	2,543	2,487	3,219	2,813	3,986	3,113	3,001	2,183	11,062	12,283	8,512
Research and development [Member]	'	'	'	'	'	'	'	'	'	'	'
Quarterly Financial Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Allocated Share-based Compensation Expense	858	947	602	614	525	504	485	405	3,021	1,919	1,988
General and administrative [Member]	'	'	'	'	'	'	'	'	'	'	'
Quarterly Financial Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Allocated Share-based Compensation Expense	$3,335	$2,922	$2,493	$856	$2,151	$1,911	$2,200	$1,951	$9,606	$8,213	$8,784