Constant Contact (CTCT) 10-Q 6 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	1-May-15
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	CTCT
Entity Registrant Name	Constant Contact, Inc.
Entity Central Index Key	1405277
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		32,158,044

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets
Cash and cash equivalents	$123,078	$104,301
Marketable securities	56,019	58,321
Accounts receivable, net of allowance for doubtful accounts	195	265
Prepaid expenses and other current assets	11,785	10,723
Total current assets	191,077	173,610
Property and equipment, net	44,320	43,739
Restricted cash	1,300	1,300
Goodwill	95,505	95,505
Acquired intangible assets, net	1,676	2,160
Deferred taxes	4,658	4,658
Other assets	1,550	1,893
Total assets	340,086	322,865
Current liabilities
Accounts payable	8,377	4,703
Accrued expenses	14,435	12,230
Deferred revenue	40,148	37,838
Total current liabilities	62,960	54,771
Other long-term liabilities	3,681	3,783
Total liabilities	66,641	58,554
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock; $0.01 par value; 5,000,000 shares authorized; no shares issued or outstanding at March 31, 2015 and December 31, 2014
Common stock; $0.01 par value; 100,000,000 shares authorized; 32,152,030 and 31,908,622 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively	322	319
Additional paid-in capital	255,164	249,599
Accumulated other comprehensive income (loss)	6	-10
Retained earnings	17,953	14,403
Total stockholders' equity	273,445	264,311
Total liabilities and stockholders' equity	$340,086	$322,865

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	32,152,030	31,908,622
Common stock, shares outstanding	32,152,030	31,908,622

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$90,417	$78,874
Cost of revenue	24,431	21,727
Gross profit	65,986	57,147
Operating expenses
Research and development	13,825	13,074
Sales and marketing	36,068	32,800
General and administrative	11,793	10,120
Total operating expenses	61,686	55,994
Income from operations	4,300	1,153
Interest income and other income (expense), net	-57	23
Income before income taxes	4,243	1,176
Income tax expense	-693	-328
Net income	$3,550	$848
Net income per share:
Basic	$0.11	$0.03
Diluted	$0.11	$0.03
Weighted average shares outstanding used in computing per share amounts:
Basic	32,091	31,289
Diluted	33,658	32,442

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$3,550	$848
Other comprehensive income (loss):
Net unrealized gains (losses) on marketable securities, net of tax	25	-3
Translation adjustment	-9	1
Total other comprehensive income (loss)	16	-2
Comprehensive income	$3,566	$846

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income	$3,550	$848
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,053	5,911
Amortization of premium on investments	84	55
Stock-based compensation expense	4,304	3,914
Provision for (recovery of) bad debts	-1	5
Income tax benefit from the exercise of stock options	-1,180	-226
Taxes paid related to net share settlement of restricted stock units	-373	-751
Changes in operating assets and liabilities:
Accounts receivable	71	39
Prepaid expenses and other current assets	115	-1,463
Other assets	343	-13
Accounts payable	1,977	-264
Accrued expenses	3,070	1,064
Deferred revenue	2,310	2,070
Other long-term liabilities	-102	-98
Net cash provided by operating activities	20,221	11,091
Cash flows from investing activities
Purchases of marketable securities	-16,014	-15,963
Proceeds from maturities of marketable securities	18,250	12,865
Acquisition of property and equipment, including costs capitalized for development of internal use software	-5,250	-5,929
Net cash used in investing activities	-3,014	-9,027
Cash flows from financing activities
Proceeds from issuance of common stock pursuant to the exercise of stock options	9,396	2,290
Income tax benefit from the exercise of stock options	1,180	226
Repurchase of common stock	-9,000
Net cash provided by financing activities	1,576	2,516
Effects of exchange rates on cash and cash equivalents	-6	1
Net increase in cash and cash equivalents	18,777	4,581
Cash and cash equivalents, beginning of period	104,301	82,478
Cash and cash equivalents, end of period	123,078	87,059
Supplemental disclosure of noncash investing and financing activities:
Capitalization of stock-based compensation	68	50
Acquisition of property and equipment included in accounts payable	$2,755

Nature_of_the_Business

Nature of the Business	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Nature of the Business	1. Nature of the Business
	Constant Contact, Inc. (the “Company”) was incorporated as a Massachusetts corporation in 1995 and was reincorporated in the State of Delaware in 2000. The Company is a leading provider of online marketing tools that are designed for small organizations, including small businesses, associations and non-profits. The Company seeks to help customers succeed by creating and growing their customer and member relationships through easy-to-use products combined with education, support, KnowHow® and coaching. In April 2014, the Company formally launched Constant Contact Toolkit™, an integrated online marketing platform that simplifies small business marketing by bringing together the tools needed to drive repeat customers and reach new ones. The Company also offers a suite of online marketing tools, including Email Marketing, EventSpot®, Social Campaigns™, SaveLocal™, SinglePlatform and Survey, that enables customers to launch and monitor marketing campaigns across multiple channels, including email, social media, events, local deals, online listings and surveys. These products are marketed and sold directly by the Company and through a wide variety of partners primarily in the United States of America.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies
	Basis of Presentation
	The accompanying condensed consolidated financial statements include those of the Company and its subsidiaries, after elimination of all intercompany accounts and transactions. The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”).
	The condensed consolidated balance sheet at December 31, 2014 was derived from audited financial statements, but does not include all disclosures required by GAAP. The accompanying unaudited condensed consolidated financial statements as of March 31, 2015 and for the three months ended March 31, 2015 and 2014 have been prepared by the Company, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto for the year ended December 31, 2014 included in the Company’s Annual Report on Form 10-K, File Number 001-33707, on file with the SEC.
	In the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the Company’s consolidated financial position as of March 31, 2015 and consolidated results of operations and of cash flows for the three months ended March 31, 2015 and 2014, have been made. The results of operations for the three months ended March 31, 2015 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2015.
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. On an ongoing basis, management evaluates these estimates, judgments and assumptions, including those related to revenue recognition, stock-based compensation, goodwill and acquired intangible assets, capitalization of software and website development costs and income taxes. The Company bases these estimates on historical and anticipated results and trends and on various other assumptions that the Company believes are reasonable under the circumstances, including assumptions as to future events. These estimates form the basis for making judgments about the carrying values of assets and liabilities and recorded revenue and expenses that are not readily apparent from other sources. Actual results could differ from these estimates.
	Marketable Securities
	The Company’s marketable securities are classified as available-for-sale and are carried at fair value with the unrealized gains and losses reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity. Realized gains and losses and declines in value judged to be other than temporary are included as a component of interest and other income (expense) based on the specific identification method.
	At March 31, 2015, marketable securities by security type consisted of:
			Amortized		Gross		Gross			Estimated
			Cost		Unrealized		Unrealized			Fair
					Gains		Losses			Value
	United States Treasury Notes		$	11,796	$	6	$	—		$	11,802
	Corporate and Agency Bonds			43,213		11		(7	)		43,217
	Commercial Paper			1,000		—		—			1,000
	Total		$	56,009	$	17	$	(7	)	$	56,019
	At March 31, 2015, marketable securities consisted of investments that mature within one year with the exception of government treasuries and corporate and agency bonds with a fair value of $19,172, which have maturities within two years.
	At December 31, 2014, marketable securities by security type consisted of:
			Amortized		Gross		Gross			Estimated
			Cost		Unrealized		Unrealized			Fair
					Gains		Losses			Value
	United States Treasury Notes		$	20,000	$	6	$	—		$	20,006
	Corporate and Agency Bonds			37,330		2		(16	)		37,316
	Commercial Paper			999		—		—			999
	Total		$	58,329	$	8	$	(16	)	$	58,321
	Fair Value of Financial Instruments
	Certain assets and liabilities are carried at fair value under GAAP. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. A fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last is considered unobservable, is used to measure fair value:
		•		Level 1 — Quoted prices in active markets for identical assets or liabilities.
		•		Level 2 — Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
		•		Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	The following tables present the Company’s fair value hierarchy for its cash equivalents and marketable securities, which are measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014:
			Fair Value Measurements at March 31, 2015 Using
			Level 1		Level 2		Level 3			Total
	Financial Assets:
	Money Market Instruments		$	8,183	$	—	$	—		$	8,183
	United States Treasury Notes			11,802		—		—			11,802
	Corporate and Agency Bonds			—		43,217		—			43,217
	Commercial Paper			—		1,000		—			1,000
	Total		$	19,985	$	44,217	$	—		$	64,202
			Fair Value Measurements at December 31, 2014 Using
			Level 1		Level 2		Level 3			Total
	Financial Assets:
	Money Market Instruments		$	5,885	$	—	$	—		$	5,885
	United States Treasury Notes			20,006		—		—			20,006
	Corporate and Agency Bonds			—		37,316		—			37,316
	Commercial Paper			—		999		—			999
	Total		$	25,891	$	38,315	$	—		$	64,206
	Net Income Per Share
	Basic net income per share is computed by dividing net income by the weighted average number of unrestricted common shares outstanding for the period.
	Diluted net income per share is computed by dividing net income by the sum of the weighted average number of unrestricted common shares outstanding during the period and the weighted average number of potential common shares from the assumed exercise of stock options and the vesting of shares of restricted stock units using the “treasury stock” method when the effect is not anti-dilutive.
	The following is a summary of the shares used in computing diluted net income per share:
	(in thousands)
			Three months ended
			March 31,
			2015		2014
	Weighted average shares used in calculating basic net income per share			32,091		31,289
	Stock options			1,397		1,029
	Warrants			—		1
	Restricted stock units			170		123
	Shares used in computing diluted net income per share			33,658		32,442
	The following common stock equivalents were excluded from the computation of diluted net income per share because they had an anti-dilutive impact as the proceeds under the treasury stock method were in excess of the average fair market value for the period:
	(in thousands)
			Three months ended
March 31,
		2015		2014
Options to purchase common stock			269		1,031
Restricted stock units			79		268
Total options exercisable into common stock and restricted stock units issuable in common stock			348		1,299
Recently Issued Accounting Pronouncements
In May 2014, the Financial Accounting Standards Board (the “FASB”) issued new guidance, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. This guidance will replace most existing revenue recognition guidance in GAAP when it becomes effective. The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The new guidance is effective for the Company commencing January 1, 2017. Early application is not permitted. The guidance permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that this guidance will have on its consolidated financial statements.
In August 2014, the FASB issued new guidance, Presentation of Financial Statements — Going Concern. The new guidance addresses management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures. Management’s evaluation should be based on relevant conditions and events that are known and reasonably knowable at the date that the financial statements are issued. The guidance will be effective for the first interim period within annual reporting periods beginning after December 15, 2016. Early adoption is permitted. The Company is evaluating the effect that this guidance will have on its consolidated financial statements.
In April 2015, the FASB issued new guidance, Intangibles—Goodwill and Other—Internal-Use Software: Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. The guidance clarifies the circumstances under which a cloud computing customer would account for the arrangement as a license of internal-use software. The guidance will be effective for the first interim period within annual reporting periods beginning after December 15, 2016. Early adoption is permitted. The Company does not believe the guidance will have a material impact on its consolidated financial statements.

Goodwill_and_Acquired_Intangib

Goodwill and Acquired Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Acquired Intangible Assets	3. Goodwill and Acquired Intangible Assets
	The carrying amount of goodwill was $95,505 at March 31, 2015 and December 31, 2014. Goodwill is not amortized, but instead is reviewed for impairment at least annually in the fourth quarter or more frequently when events and circumstances occur indicating that the recorded goodwill may be impaired.
	Intangible assets consist of the following:
				March 31, 2015						December 31, 2014
		Estimated		Gross		Accumulated		Net Carrying		Gross		Accumulated		Net Carrying
		Useful Life		Carrying		Amortization		Amount		Carrying		Amortization		Amount
				Amount						Amount
	Developed technology		3 years	$	4,357	$	3,710	$	647	$	4,357	$	3,465	$	892
	Customer relationships		3.75 years		3,315		2,841		474		3,315		2,666		649
	Publisher relationships		5 years		710		402		308		710		367		343
	Trade name		5 years		570		323		247		570		294		276
				$	8,952	$	7,276	$	1,676	$	8,952	$	6,792	$	2,160
	The Company amortizes the intangible assets over the estimated useful lives noted above. Amortization of the developed technology and publisher relationships assets is on a straight-line basis as the pattern of consumption of the economic benefits of the intangible assets cannot be reliably determined. The Company also amortizes the trade name asset over its estimated useful life on a straight-line basis as the straight-line basis is not materially different than the pattern of consumption of economic benefit basis. Customer relationships are amortized over their useful life based on the pattern of consumption of economic benefit of the asset. Amortization commences once the asset has been placed in service. Amortization expense for intangible assets was $484 and $567 for the three months ended March 31, 2015 and 2014, respectively. Amortization relating to developed technology and publisher relationships is recorded within cost of revenue and amortization of customer relationships and trade name is recorded within sales and marketing expense. Future estimated amortization expense for intangible assets as of March 31, 2015 is as follows:
	Remainder of 2015	$	1,099
	2016		470
	2017		107
	Total	$	1,676

Stockholders_Equity_and_StockB

Stockholders' Equity and Stock-Based Compensation	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stockholders' Equity and Stock-Based Compensation	4. Stockholders’ Equity and Stock-Based Compensation
	Stock Repurchase Program
	In the second quarter of 2014, the Board of Directors authorized the repurchase of up to $30,000 of its common stock through July 31, 2015. Under the authorization, the Company can repurchase shares in the open market, which may include the use of 10b5-1 trading plans, or through privately negotiated transactions. The timing and amount of repurchases, if any, will depend upon several factors, including market and business conditions. Stock repurchases may be suspended or discontinued at any time. The Company intends to fund repurchases from its cash and cash equivalents.
	During the three months ended March 31, 2015, the Company repurchased 228,671 shares of its common stock at an average price of $39.36 per share. These shares were retired and returned to authorized but unissued shares and accounted for as a reduction to stockholders’ equity in the Company’s condensed consolidated balance sheet.
	Stock-Based Compensation Expense
	The Company grants stock-based awards under its existing 2011 Stock Incentive Plan and its 2007 Employee Stock Purchase Plan. The Company also has outstanding stock-based awards under its 1999 Stock Option/Stock Issuance Plan and 2012 Inducement Award Plan but is no longer granting awards under these plans. As of March 31, 2015, 1,740,896 shares of common stock are available for issuance under the 2011 Stock Incentive Plan. As of March 31, 2015, 312,026 shares of common stock are available for issuance to participating employees under the 2007 Employee Stock Purchase Plan. The Company applies the fair value recognition provisions for all stock-based awards granted or modified in accordance with authoritative guidance. Under this guidance the Company records compensation costs over the requisite service period of the award based on the grant-date fair value. The straight-line method is applied to all grants with service conditions, while the graded vesting method is applied to all grants with both service and performance conditions.
	The Company recognized stock-based compensation expense on all awards in cost of revenue and operating expense categories as follows:
		Three months ended
		March 31,
		2015		2014
	Cost of revenue	$	499	$	442
	Research and development		867		1,020
	Sales and marketing		1,191		1,032
	General and administrative		1,747		1,420
		$	4,304	$	3,914
	Additionally, the Company capitalized $68 and $50 of stock-based compensation related to the development of internal-use software for the three months ended March 31, 2015 and 2014, respectively.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	5. Income Taxes
	For the three months ended March 31, 2015 and 2014, the Company recorded income tax expense of $693 and $328, respectively. Income tax is related to federal, state, and to a lesser extent, foreign tax obligations. The Company’s effective tax rate may vary from period to period based on changes in estimated taxable income or loss, changes to federal, state or foreign tax laws, deductibility of certain costs and expenses, and as a result of acquisitions.
	The Company’s estimated effective tax rate for 2015 and 2014, which has been applied to the Company’s income before income taxes for the three months ended March 31, 2015 and 2014, varies from the statutory rate primarily due to non-deductible stock-based compensation expense, that increases the effective tax rate, partially offset by state research and development credits that decrease the effective tax rate. The federal research and development credit has not yet been enacted for 2015 and had not yet been enacted in the first quarter of 2014 and therefore was not included in the Company’s estimated effective tax rate for either 2015 or 2014. The income tax expense for the first quarters of 2015 and 2014 was further reduced by the impact of disqualifying dispositions of incentive stock options during the periods.
	The Company had net deferred tax assets of $6,443 at December 31, 2014, which did not change at March 31, 2015.
	The Company has not recorded any amounts for unrecognized tax benefits as of March 31, 2015 or December 31, 2014. As of March 31, 2015 and December 31, 2014, the Company had no accrued interest or tax penalties recorded.

Accrued_Expenses

Accrued Expenses	3 Months Ended
	Mar. 31, 2015
Payables and Accruals [Abstract]
Accrued Expenses	6. Accrued Expenses
		March 31,		December 31,
		2015		2014
	Payroll and payroll-related	$	5,627	$	4,430
	Licensed software and maintenance		1,197		1,197
	Marketing programs		1,968		490
	Other accrued expenses		5,643		6,113
		$	14,435	$	12,230

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	7. Commitments and Contingencies
	Office Leases
	The Company has a lease for its headquarters space in Waltham, Massachusetts (the “Lease”) that is effective through September 2022 with one ten-year extension option. The Lease includes space the Company is currently occupying as well as space that will be made available at various points in time during the term.
	The Company leases office space for a sales and support office in Colorado under a lease agreement effective through April 2019 with three three-year extension options. The Company also leases small amounts of general office space in Florida, New York, California and the United Kingdom under lease agreements that expire at various dates through 2018.
	Lease incentives, payment escalations and rent holidays specified in the lease agreements are accrued or deferred as appropriate such that rent expense per square foot is recognized on a straight-line basis over the terms of occupancy.
	At March 31, 2015 and December 31, 2014, the Company had both prepaid rent and accrued rent balances related to its office leases. The prepaid rent balance was $52 as of March 31, 2015, of which $13 was included in prepaid expenses and other current assets and $39 was included in other assets. The accrued rent balance was $4,268 as of March 31, 2015, of which $705 was included in accrued expenses and $3,563 was included in other long-term liabilities. The prepaid rent balance was $51 at December 31, 2014, of which $3 was included in prepaid expenses and other current assets and $48 was included in other assets. The accrued rent balance was $4,232 at December 31, 2014, of which $577 was included in accrued expenses and $3,655 was included in other long-term liabilities.
	As of March 31, 2015, future minimum lease payments under non-cancelable office leases are as follows:
	Remainder of 2015	$	7,176
	2016		10,061
	2017		10,005
	2018		9,604
	2019		8,492
	Thereafter		22,462
			67,800
	Less: Sublease income		628
		$	67,172
	Total rent expense under office leases was $2,409 and $2,320 for the three months ended March 31, 2015 and 2014, respectively. Total rent expense for the three months ended March 31, 2015 is net of sublease income of $47.
	Third-Party Hosting Agreements
	The Company has agreements with two affiliated vendors to provide specialized space and equipment and related services from which the Company hosts its software applications. Payment escalations and rent holidays specified in these agreements are accrued or deferred as appropriate such that rent expense per square foot is recognized on a straight-line basis over the terms of occupancy. As of March 31, 2015 and December 31, 2014, the Company had both prepaid rent and accrued rent balances related to these agreements. As of March 31, 2015, the Company had prepaid rent of $429, of which $277 was included in prepaid expenses and other current assets and $152 was included in other assets. Of the accrued rent balance of $166, $47 was included in accrued expenses and $119 was included in other long-term liabilities. At December 31, 2014, the Company had prepaid rent of $501, of which $295 was included in prepaid expenses and other current assets and $206 was included in other assets. The accrued rent balance was $172 of which $38 was included in accrued expense and other current liabilities and $134 was included in other long-term liabilities.
	The agreements include payment commitments that expire at various dates through 2017. As of March 31, 2015, future minimum payments under the agreements are as follows:
	Remainder of 2015	$	2,958
	2016		4,049
	2017		775
	Total	$	7,782
	Total rent expense under hosting agreements was $1,105 and $1,063 for the three months ended March 31, 2015 and 2014, respectively.
	Vendor Commitments
	As of March 31, 2015, the Company had issued both cancellable and non-cancellable purchase orders to various vendors and entered into contractual commitments with various vendors totaling $27,901 related to marketing programs and other non-marketing goods and services to be delivered principally during 2015.
	Letters of Credit and Restricted Cash
	As of March 31, 2015 and December 31, 2014, the Company maintained a letter of credit totaling $1,300 for the benefit of the landlord of the Lease. The landlord can draw against the letter of credit in the event of default by the Company. The Company was required to maintain a cash balance of at least $1,300 as of March 31, 2015 and December 31, 2014 to secure the letter of credit. These amounts were classified as restricted cash in the balance sheet at March 31, 2015 and December 31, 2014.
	Indemnification Obligations
	The Company enters into standard indemnification agreements with the Company’s channel partners and certain other third parties in the ordinary course of business. Pursuant to these agreements, the Company indemnifies and agrees to reimburse the indemnified party for losses incurred by the indemnified party in connection with certain intellectual property infringement and other claims by any third party with respect to the Company’s business and technology. Based on historical information and information known as of March 31, 2015, the Company does not expect it will incur any significant liabilities under these indemnification agreements.
	Legal Matters
	In September 2012, RPost Holdings, Inc., RPost Communications Limited and RMail Limited (collectively, “RPost”) filed a complaint in the United States District Court for the Eastern District of Texas that named the Company as a defendant in a lawsuit. The complaint alleged that certain elements of the Company’s email marketing technology infringe five patents held by RPost. RPost seeks an award for damages in an unspecified amount and injunctive relief. In February 2013, RPost amended its complaint to name five of the Company’s marketing partners as defendants. Under the Company’s contractual agreements with these marketing partners, the Company is obligated to indemnify them for claims related to patent infringement. The Company filed a motion to sever and stay the claims against its partners and multiple motions to dismiss the claims against the Company. In January 2014, the case was stayed pending the resolution of certain state court and bankruptcy court actions involving RPost, to which the Company is not a party. The stay was extended by agreement of the parties in December 2014. This litigation is in its very early stages. As a result, neither the ultimate outcome of this litigation nor an estimate of a probable loss or any reasonably possible losses can be assessed at this time. Nevertheless, the Company believes that it has meritorious defenses to any claim of infringement and intends to defend itself vigorously.
	In March 2013, CreateAds LLC (“CreateAds”) filed a complaint in the United States District Court for the District of Delaware that named the Company as a defendant in a lawsuit. The complaint, which was served on the Company on March 8, 2013, alleged that certain elements of the Company’s email marketing technology infringe a patent held by CreateAds. CreateAds seeks an award for damages in an unspecified amount and injunctive relief. In February 2014, the case was stayed pending a decision by the United States Supreme Court in the appeal of a patent case with issues very similar to the ones pending in the Company’s motion to dismiss. Following the Supreme Court’s decision in June 2014, the Company filed a motion for summary judgment seeking to invalidate the patent for lack of patent-eligible subject matter. By agreement of the parties, the case was dismissed with prejudice as to the claims raised by CreateAds in February 2015.
	The Company is from time to time subject to various other legal proceedings and claims, either asserted or unasserted, which arise in the ordinary course of its business. While the outcome of these other claims cannot be predicted with certainty, management does not believe that the outcome of any of these other legal matters will have a material adverse effect on the Company’s results of operations or financial condition.

401k_Savings_Plan

401(k) Savings Plan	3 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
401(k) Savings Plan	8. 401(k) Savings Plan
	The Company has a defined contribution savings plan under Section 401(k) of the Internal Revenue Code of 1986. This plan covers substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. Company contributions to the plan may be made at the discretion of the Board of Directors. The Company elected to make matching contributions for the plan years ending December 31, 2015 and 2014 at a rate of 100% of each employee’s contribution up to a maximum matching contribution of 3% of the employee’s compensation and at a rate of 50% of each employee’s contribution in excess of 3% up to a maximum of 5% of the employee’s compensation.
	Through March 31, 2015 and 2014, the Company made matching contributions of $1,068 and $863 for the plan years ended December 31, 2015 and 2014, respectively.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	The accompanying condensed consolidated financial statements include those of the Company and its subsidiaries, after elimination of all intercompany accounts and transactions. The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”).
	The condensed consolidated balance sheet at December 31, 2014 was derived from audited financial statements, but does not include all disclosures required by GAAP. The accompanying unaudited condensed consolidated financial statements as of March 31, 2015 and for the three months ended March 31, 2015 and 2014 have been prepared by the Company, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto for the year ended December 31, 2014 included in the Company’s Annual Report on Form 10-K, File Number 001-33707, on file with the SEC.
	In the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the Company’s consolidated financial position as of March 31, 2015 and consolidated results of operations and of cash flows for the three months ended March 31, 2015 and 2014, have been made. The results of operations for the three months ended March 31, 2015 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2015.
Use of Estimates	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. On an ongoing basis, management evaluates these estimates, judgments and assumptions, including those related to revenue recognition, stock-based compensation, goodwill and acquired intangible assets, capitalization of software and website development costs and income taxes. The Company bases these estimates on historical and anticipated results and trends and on various other assumptions that the Company believes are reasonable under the circumstances, including assumptions as to future events. These estimates form the basis for making judgments about the carrying values of assets and liabilities and recorded revenue and expenses that are not readily apparent from other sources. Actual results could differ from these estimates.
Marketable Securities	Marketable Securities
	The Company’s marketable securities are classified as available-for-sale and are carried at fair value with the unrealized gains and losses reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity. Realized gains and losses and declines in value judged to be other than temporary are included as a component of interest and other income (expense) based on the specific identification method.
	At March 31, 2015, marketable securities by security type consisted of:
			Amortized		Gross		Gross			Estimated
			Cost		Unrealized		Unrealized			Fair
					Gains		Losses			Value
	United States Treasury Notes		$	11,796	$	6	$	—		$	11,802
	Corporate and Agency Bonds			43,213		11		(7	)		43,217
	Commercial Paper			1,000		—		—			1,000
	Total		$	56,009	$	17	$	(7	)	$	56,019
	At March 31, 2015, marketable securities consisted of investments that mature within one year with the exception of government treasuries and corporate and agency bonds with a fair value of $19,172, which have maturities within two years.
	At December 31, 2014, marketable securities by security type consisted of:
			Amortized		Gross		Gross			Estimated
			Cost		Unrealized		Unrealized			Fair
					Gains		Losses			Value
	United States Treasury Notes		$	20,000	$	6	$	—		$	20,006
	Corporate and Agency Bonds			37,330		2		(16	)		37,316
	Commercial Paper			999		—		—			999
	Total		$	58,329	$	8	$	(16	)	$	58,321
Fair Value of Financial Instruments	Fair Value of Financial Instruments
	Certain assets and liabilities are carried at fair value under GAAP. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. A fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last is considered unobservable, is used to measure fair value:
		•		Level 1 — Quoted prices in active markets for identical assets or liabilities.
		•		Level 2 — Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
		•		Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	The following tables present the Company’s fair value hierarchy for its cash equivalents and marketable securities, which are measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014:
			Fair Value Measurements at March 31, 2015 Using
			Level 1		Level 2		Level 3			Total
	Financial Assets:
	Money Market Instruments		$	8,183	$	—	$	—		$	8,183
	United States Treasury Notes			11,802		—		—			11,802
	Corporate and Agency Bonds			—		43,217		—			43,217
	Commercial Paper			—		1,000		—			1,000
	Total		$	19,985	$	44,217	$	—		$	64,202
			Fair Value Measurements at December 31, 2014 Using
			Level 1		Level 2		Level 3			Total
	Financial Assets:
	Money Market Instruments		$	5,885	$	—	$	—		$	5,885
	United States Treasury Notes			20,006		—		—			20,006
	Corporate and Agency Bonds			—		37,316		—			37,316
	Commercial Paper			—		999		—			999
	Total		$	25,891	$	38,315	$	—		$	64,206
Net Income Per Share	Net Income Per Share
	Basic net income per share is computed by dividing net income by the weighted average number of unrestricted common shares outstanding for the period.
	Diluted net income per share is computed by dividing net income by the sum of the weighted average number of unrestricted common shares outstanding during the period and the weighted average number of potential common shares from the assumed exercise of stock options and the vesting of shares of restricted stock units using the “treasury stock” method when the effect is not anti-dilutive.
	The following is a summary of the shares used in computing diluted net income per share:
			Three months ended
			March 31,
	(in thousands)		2015		2014
	Weighted average shares used in calculating basic net income per share			32,091		31,289
	Stock options			1,397		1,029
	Warrants			—		1
	Restricted stock units			170		123
	Shares used in computing diluted net income per share			33,658		32,442
	The following common stock equivalents were excluded from the computation of diluted net income per share because they had an anti-dilutive impact as the proceeds under the treasury stock method were in excess of the average fair market value for the period:
			Three months ended
			March 31,
	(in thousands)		2015		2014
	Options to purchase common stock			269		1,031
	Restricted stock units			79		268
	Total options exercisable into common stock and restricted stock units issuable in common stock			348		1,299
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (the “FASB”) issued new guidance, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. This guidance will replace most existing revenue recognition guidance in GAAP when it becomes effective. The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The new guidance is effective for the Company commencing January 1, 2017. Early application is not permitted. The guidance permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that this guidance will have on its consolidated financial statements.
	In August 2014, the FASB issued new guidance, Presentation of Financial Statements — Going Concern. The new guidance addresses management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures. Management’s evaluation should be based on relevant conditions and events that are known and reasonably knowable at the date that the financial statements are issued. The guidance will be effective for the first interim period within annual reporting periods beginning after December 15, 2016. Early adoption is permitted. The Company is evaluating the effect that this guidance will have on its consolidated financial statements.
	In April 2015, the FASB issued new guidance, Intangibles—Goodwill and Other—Internal-Use Software: Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. The guidance clarifies the circumstances under which a cloud computing customer would account for the arrangement as a license of internal-use software. The guidance will be effective for the first interim period within annual reporting periods beginning after December 15, 2016. Early adoption is permitted. The Company does not believe the guidance will have a material impact on its consolidated financial statements.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Summary of Marketable Securities by Security Type	At March 31, 2015, marketable securities by security type consisted of:
		Amortized		Gross		Gross			Estimated
		Cost		Unrealized		Unrealized			Fair
				Gains		Losses			Value
	United States Treasury Notes	$	11,796	$	6	$	—		$	11,802
	Corporate and Agency Bonds		43,213		11		(7	)		43,217
	Commercial Paper		1,000		—		—			1,000
	Total	$	56,009	$	17	$	(7	)	$	56,019
	At March 31, 2015, marketable securities consisted of investments that mature within one year with the exception of government treasuries and corporate and agency bonds with a fair value of $19,172, which have maturities within two years.
	At December 31, 2014, marketable securities by security type consisted of:
		Amortized		Gross		Gross			Estimated
		Cost		Unrealized		Unrealized			Fair
				Gains		Losses			Value
	United States Treasury Notes	$	20,000	$	6	$	—		$	20,006
	Corporate and Agency Bonds		37,330		2		(16	)		37,316
	Commercial Paper		999		—		—			999
	Total	$	58,329	$	8	$	(16	)	$	58,321
Fair Value Hierarchy for Cash Equivalents and Marketable Securities Measured at Fair Value on Recurring Basis	The following tables present the Company’s fair value hierarchy for its cash equivalents and marketable securities, which are measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014:
		Fair Value Measurements at March 31, 2015 Using
		Level 1		Level 2		Level 3			Total
	Financial Assets:
	Money Market Instruments	$	8,183	$	—	$	—		$	8,183
	United States Treasury Notes		11,802		—		—			11,802
	Corporate and Agency Bonds		—		43,217		—			43,217
	Commercial Paper		—		1,000		—			1,000
	Total	$	19,985	$	44,217	$	—		$	64,202
		Fair Value Measurements at December 31, 2014 Using
		Level 1		Level 2		Level 3			Total
	Financial Assets:
	Money Market Instruments	$	5,885	$	—	$	—		$	5,885
	United States Treasury Notes		20,006		—		—			20,006
	Corporate and Agency Bonds		—		37,316		—			37,316
	Commercial Paper		—		999		—			999
	Total	$	25,891	$	38,315	$	—		$	64,206
Summary of Shares Used in Computing Diluted Net Income Per Share	The following is a summary of the shares used in computing diluted net income per share:
	(in thousands)
		Three months ended
		March 31,
		2015		2014
	Weighted average shares used in calculating basic net income per share		32,091		31,289
	Stock options		1,397		1,029
	Warrants		—		1
	Restricted stock units		170		123
	Shares used in computing diluted net income per share		33,658		32,442
Common Stock Equivalents Excluded from Computation of Diluted Net Income Per Share	The following common stock equivalents were excluded from the computation of diluted net income per share because they had an anti-dilutive impact as the proceeds under the treasury stock method were in excess of the average fair market value for the period:
	(in thousands)
		Three months ended
		March 31,
		2015		2014
	Options to purchase common stock		269		1,031
	Restricted stock units		79		268
	Total options exercisable into common stock and restricted stock units issuable in common stock		348		1,299

Goodwill_and_Acquired_Intangib1

Goodwill and Acquired Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible assets consist of the following:
				March 31, 2015						December 31, 2014
		Estimated		Gross		Accumulated		Net Carrying		Gross		Accumulated		Net Carrying
		Useful Life		Carrying		Amortization		Amount		Carrying		Amortization		Amount
				Amount						Amount
	Developed technology		3 years	$	4,357	$	3,710	$	647	$	4,357	$	3,465	$	892
	Customer relationships		3.75 years		3,315		2,841		474		3,315		2,666		649
	Publisher relationships		5 years		710		402		308		710		367		343
	Trade name		5 years		570		323		247		570		294		276
				$	8,952	$	7,276	$	1,676	$	8,952	$	6,792	$	2,160
Future Estimated Amortization Expense for Intangible Assets	Future estimated amortization expense for intangible assets as of March 31, 2015 is as follows:
	Remainder of 2015	$	1,099
	2016		470
	2017		107
	Total	$	1,676

Stockholders_Equity_and_StockB1

Stockholders' Equity and Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Recognized Stock-Based Compensation Expense	The Company recognized stock-based compensation expense on all awards in cost of revenue and operating expense categories as follows:
		Three months ended
		March 31,
		2015		2014
	Cost of revenue	$	499	$	442
	Research and development		867		1,020
	Sales and marketing		1,191		1,032
	General and administrative		1,747		1,420
		$	4,304	$	3,914

Accrued_Expenses_Tables

Accrued Expenses (Tables)	3 Months Ended
	Mar. 31, 2015
Payables and Accruals [Abstract]
Components of Accrued Expenses
		March 31,		December 31,
		2015		2014
	Payroll and payroll-related	$	5,627	$	4,430
	Licensed software and maintenance		1,197		1,197
	Marketing programs		1,968		490
	Other accrued expenses		5,643		6,113
		$	14,435	$	12,230

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2015
Office Leases [Member]
Future Minimum Lease Payments under Leases and Agreements	As of March 31, 2015, future minimum lease payments under non-cancelable office leases are as follows:
	Remainder of 2015	$	7,176
	2016		10,061
	2017		10,005
	2018		9,604
	2019		8,492
	Thereafter		22,462
			67,800
	Less: Sublease income		628
		$	67,172
Third-Party Hosting Agreements [Member]
Future Minimum Lease Payments under Leases and Agreements	As of March 31, 2015, future minimum payments under the agreements are as follows:
	Remainder of 2015	$	2,958
	2016		4,049
	2017		775
	Total	$	7,782

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Summary of Marketable Securities by Security Type (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$56,009	$58,329
Gross Unrealized Gains	17	8
Gross Unrealized Losses	-7	-16
Estimated Fair Value	56,019	58,321
Corporate and Agency Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	43,213	37,330
Gross Unrealized Gains	11	2
Gross Unrealized Losses	-7	-16
Estimated Fair Value	43,217	37,316
United States Treasury Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,796	20,000
Gross Unrealized Gains	6	6
Estimated Fair Value	11,802	20,006
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,000	999
Estimated Fair Value	$1,000	$999

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Maturity period for marketable securities classified as available-for-sale	1 year
Corporate and Agency Bonds [Member]
Summary Of Significant Accounting Policies [Line Items]
Fair value of agency bonds and treasury notes classified as available-for-sale securities	19,172
Corporate and Agency Bonds [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Maturity period for marketable securities classified as available-for-sale	2 years

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Fair Value Hierarchy for Cash Equivalents and Marketable Securities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financial Assets:
Available for sale securities fair value disclosure	$56,019	$58,321
United States Treasury Notes [Member]
Financial Assets:
Available for sale securities fair value disclosure	11,802	20,006
Commercial Paper [Member]
Financial Assets:
Available for sale securities fair value disclosure	1,000	999
Recurring [Member]
Financial Assets:
Total	64,202	64,206
Recurring [Member] | Money Market Instruments [Member]
Financial Assets:
Cash and cash equivalents fair value disclosure	8,183	5,885
Recurring [Member] | United States Treasury Notes [Member]
Financial Assets:
Available for sale securities fair value disclosure	11,802	20,006
Recurring [Member] | Corporate and Agency Bonds [Member]
Financial Assets:
Available for sale securities fair value disclosure	43,217	37,316
Recurring [Member] | Commercial Paper [Member]
Financial Assets:
Available for sale securities fair value disclosure	1,000	999
Level 2 [Member] | Recurring [Member]
Financial Assets:
Total	44,217	38,315
Level 2 [Member] | Recurring [Member] | Corporate and Agency Bonds [Member]
Financial Assets:
Available for sale securities fair value disclosure	43,217	37,316
Level 2 [Member] | Recurring [Member] | Commercial Paper [Member]
Financial Assets:
Available for sale securities fair value disclosure	1,000	999
Level 1 [Member] | Recurring [Member]
Financial Assets:
Total	19,985	25,891
Level 1 [Member] | Recurring [Member] | Money Market Instruments [Member]
Financial Assets:
Cash and cash equivalents fair value disclosure	8,183	5,885
Level 1 [Member] | Recurring [Member] | United States Treasury Notes [Member]
Financial Assets:
Available for sale securities fair value disclosure	$11,802	$20,006

Summary_of_Significant_Account6

Summary of Significant Accounting Policies - Summary of Shares used in Computing Diluted Net Income Per Share (Detail)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average shares used in calculating basic net income per share	32,091	31,289
Shares used in computing diluted net income per share	33,658	32,442
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Restricted stock units	1,397	1,029
Restricted Stock Units [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Restricted stock units	170	123
Warrants [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Warrants		1

Summary_of_Significant_Account7

Summary of Significant Accounting Policies - Common Stock Equivalents Excluded from Computation of Diluted Net Income Per Share (Detail)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total options exercisable into common stock and restricted stock units issuable in common stock	348	1,299
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total options exercisable into common stock and restricted stock units issuable in common stock	269	1,031
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total options exercisable into common stock and restricted stock units issuable in common stock	79	268

Goodwill_and_Acquired_Intangib2

Goodwill and Acquired Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Carrying amount of goodwill	$95,505		$95,505
Amortization expense for intangible assets	$484	$567

Goodwill_and_Acquired_Intangib3

Goodwill and Acquired Intangible Assets - Intangible Assets (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$8,952	$8,952
Accumulated Amortization	7,276	6,792
Net Carrying Amount	1,676	2,160
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Gross Carrying Amount	4,357	4,357
Accumulated Amortization	3,710	3,465
Net Carrying Amount	647	892
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years 9 months
Gross Carrying Amount	3,315	3,315
Accumulated Amortization	2,841	2,666
Net Carrying Amount	474	649
Publisher Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Gross Carrying Amount	710	710
Accumulated Amortization	402	367
Net Carrying Amount	308	343
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Gross Carrying Amount	570	570
Accumulated Amortization	323	294
Net Carrying Amount	$247	$276

Goodwill_and_Acquired_Intangib4

Goodwill and Acquired Intangible Assets - Future Estimated Amortization Expense for Intangible Assets (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2015	$1,099
2016	470
2017	107
Net Carrying Amount	$1,676	$2,160

Stockholders_Equity_and_StockB2

Stockholders' Equity and Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program number of shares authorized to be repurchased	228,671
Stock repurchase program average purchase price per share	$39.36
Capitalized stock-based compensation expense	$68	$50
2011 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for issuance	1,740,896
2007 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for issuance	312,026
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program authorized amount of shares repurchased			$30,000

Stockholders_Equity_and_StockB3

Stockholders' Equity and Stock-Based Compensation - Recognized Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$4,304	$3,914
Cost of Revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	499	442
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	867	1,020
Sales and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,191	1,032
General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$1,747	$1,420

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$693,000	$328,000
Net deferred tax assets	6,443,000		6,443,000
Unrecognized tax benefits	0		0
Unrecognized tax benefits, accrued interest or tax penalties	$0		$0

Accrued_Expenses_Components_of

Accrued Expenses - Components of Accrued Expenses (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Payables and Accruals [Abstract]
Payroll and payroll-related	$5,627	$4,430
Licensed software and maintenance	1,197	1,197
Marketing programs	1,968	490
Other accrued expenses	5,643	6,113
Accrued expenses, total	$14,435	$12,230

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Operating Leased Assets [Line Items]
Expiration of lease agreement	Various dates through 2017
Prepaid expenses and other current assets	$11,785		$10,723
Other assets	1,550		1,893
Amount of contractual commitments with various vendors for 2015	27,901
Letter of credit for the benefit of the landlord	1,300		1,300
Cash balance to secure the letter of credit	1,300		1,300
Office Leases [Member]
Operating Leased Assets [Line Items]
Prepaid rent	52		51
Prepaid expenses and other current assets	13		3
Other assets	39		48
Accrued rent balance	4,268		4,232
Rent expense	2,409	2,320
Income on sublease	47
Office Leases [Member] | Accrued Expenses [Member]
Operating Leased Assets [Line Items]
Accrued rent balance included in accrued expenses	705		577
Office Leases [Member] | Other Long-Term Liabilities [Member]
Operating Leased Assets [Line Items]
Accrued rent balance included in other long-term liabilities	3,563		3,655
Third-Party Hosting Agreements [Member]
Operating Leased Assets [Line Items]
Prepaid rent	429		501
Prepaid expenses and other current assets	277		295
Other assets	152		206
Accrued rent balance	166		172
Rent expense	1,105	1,063
Number of vendors provide for related services	2
Third-Party Hosting Agreements [Member] | Accrued Expenses [Member]
Operating Leased Assets [Line Items]
Accrued rent balance included in accrued expenses	47		38
Third-Party Hosting Agreements [Member] | Other Long-Term Liabilities [Member]
Operating Leased Assets [Line Items]
Accrued rent balance included in other long-term liabilities	$119		$134
Headquarters Space [Member]
Operating Leased Assets [Line Items]
Lease expiration date	22-Sep-22
Time period for extension option	10 years
Number of extension option	1
Sales and Support Office [Member]
Operating Leased Assets [Line Items]
Time period for extension option	3 years
Number of extension option	3
Expiration of lease agreement	Apr-19
General Office [Member]
Operating Leased Assets [Line Items]
Expiration of lease agreement	Various dates through 2018

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments under Leases and Agreements (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Office Leases [Member]
Operating Leased Assets [Line Items]
Remainder of 2015	$7,176
2016	10,061
2017	10,005
2018	9,604
2019	8,492
Thereafter	22,462
Total	67,800
Less: Sublease income	628
Net operating lease obligation	67,172
Third-Party Hosting Agreements [Member]
Operating Leased Assets [Line Items]
Remainder of 2015	2,958
2016	4,049
2017	775
Total	$7,782

401k_Savings_Plan_Additional_I

401(k) Savings Plan - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Defined Contribution Plan Disclosure [Line Items]
Contribution by employer to 401 (k) Savings Plan	$1,068	$863
Employee's Contributions up to 3% [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent	100.00%	100.00%
Employee's Contributions Between 3% and 5% [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent	50.00%	50.00%
100% of Matching Contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of the employee's compensation	3.00%	3.00%
50% of Matching Contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of the employee's compensation	5.00%	5.00%
50% of Matching Contribution [Member] | Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of the employee's compensation	3.00%	3.00%