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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2014	Apr. 24, 2014
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Trading Symbol	SPSC
Entity Registrant Name	SPS COMMERCE INC
Entity Central Index Key	0001092699
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		16,203,384

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013
CURRENT ASSETS
Cash and cash equivalents	$ 134,603	$ 131,294
Accounts receivable, less allowance for doubtful accounts of $233 and $237, respectively	12,166	11,611
Deferred costs, current	9,539	9,048
Deferred income taxes, current	1,272	1,272
Prepaid expenses and other current assets	2,797	2,850
Total current assets	160,377	156,075
PROPERTY AND EQUIPMENT, net	9,479	9,922
GOODWILL	25,487	25,487
INTANGIBLE ASSETS, net	16,365	17,082
OTHER ASSETS
Deferred costs, net of current portion	3,957	3,684
Deferred income taxes, net of current portion	10,697	10,870
Other non-current assets	197	210
Total assets	226,559	223,330
CURRENT LIABILITIES
Accounts payable	2,243	1,798
Accrued compensation and benefits	7,694	7,981
Accrued expenses and other current liabilities	3,069	2,801
Deferred revenue, current	6,493	6,335
Total current liabilities	19,499	18,915
OTHER LIABILITIES
Deferred revenue, less current portion	9,201	8,785
Deferred rent	2,762	2,857
Total liabilities	31,462	30,557
COMMITMENTS and CONTINGENCIES
STOCKHOLDERS' EQUITY
Preferred stock, $0.001 par value; 5,000,000 shares authorized; 0 shares issued and outstanding
Common stock, $0.001 par value; 55,000,000 shares authorized; 16,182,693 and 16,092,121 shares issued and outstanding, respectively	16	16
Additional paid-in capital	241,500	239,549
Accumulated deficit	(46,419)	(46,792)
Total stockholders' equity	195,097	192,773
Total liabilities and stockholder's equity	$ 226,559	$ 223,330

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 233	$ 237
Preferred stock, par value	$ 0.001	$ 0.001
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	$ 0.001	$ 0.001
Common stock, shares authorized	55,000,000	55,000,000
Common stock, shares issued	16,182,693	16,092,121
Common stock, shares outstanding	16,182,693	16,092,121

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Revenues	$ 28,939	$ 23,752
Cost of revenues	9,255	7,066
Gross profit	19,684	16,686
Operating expenses
Sales and marketing	10,884	9,225
Research and development	2,974	2,503
General and administrative	4,511	4,047
Amortization of intangible assets	717	717
Total operating expenses	19,086	16,492
Income from operations	598	194
Other income (expense)
Interest income	49	23
Other expense	(56)	(84)
Total other expense, net	(7)	(61)
Income before income taxes	591	133
Income tax (expense) benefit	(218)	66
Net income	$ 373	$ 199
Net income per share
Basic	$ 0.02	$ 0.01
Diluted	$ 0.02	$ 0.01
Weighted average common shares used to compute net income per share
Basic	16,155	14,884
Diluted	16,830	15,564

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net income	$ 373	$ 199
Reconciliation of net income to net cash provided by operating activities
Deferred income taxes	173	(72)
Depreciation and amortization of property and equipment	1,304	1,171
Amortization of intangible assets	717	717
Provision for doubtful accounts	157	80
Stock-based compensation	1,339	924
Changes in assets and liabilities
Accounts receivable	(712)	72
Deferred costs	(764)	(778)
Prepaid expenses and other current assets	66	2,831
Accounts payable	445	177
Accrued compensation and benefits	(287)	659
Accrued expenses and other current liabilities	255	214
Deferred rent	(82)
Deferred revenue	574	355
Net cash provided by operating activities	3,558	6,549
Cash flows from investing activities
Purchases of property and equipment	(861)	(1,089)
Net cash used in investing activities	(861)	(1,089)
Cash flows from financing activities
Net proceeds from exercise of options to purchase common stock	587	1,049
Excess tax benefit from exercise of options to purchase common stock	25
Net cash provided by financing activities	612	1,049
Net increase in cash and cash equivalents	3,309	6,509
Cash and cash equivalents at beginning of period	131,294	66,050
Cash and cash equivalents at end of period	$ 134,603	$ 72,559

General	3 Months Ended
General	Mar. 31, 2014
Accounting Policies [Abstract]
General	NOTE A – General Business Description We are a leading provider of cloud-based supply chain management solutions, providing prewired, proven integrations and comprehensive retail performance analytics to thousands of customers worldwide. We provide our solutions through the SPS Commerce platform, a cloud-based software suite that improves the way suppliers, retailers, distributors and other customers manage and fulfill orders. We derive the majority of our revenues from thousands of monthly recurring subscriptions from businesses that utilize our solutions. Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of SPS Commerce, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in the condensed consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, these condensed consolidated financial statements do not include all of the information and notes required by GAAP. We have included all normal recurring adjustments considered necessary to give a fair statement of our financial position, results of operations and cash flows for the interim periods shown. Operating results for these interim periods are not necessarily indicative of the results to be expected for the full year. The December 31, 2013 condensed consolidated balance sheet data was derived from our audited financial statements at that date. For further information, refer to the consolidated financial statements and accompanying notes for the year ended December 31, 2013 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on February 20, 2014. Use of Estimates Preparing financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Significant Accounting Policies During the three months ended March 31, 2014, there were no material changes in our significant accounting policies. See Note A to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2013, as filed with the Securities and Exchange Commission on February 20, 2014, for additional information regarding our significant accounting policies. Recent Accounting Pronouncements We have evaluated all recent accounting pronouncements and believe that none of them will have a material effect on our consolidated financial statements.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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+ Details

Goodwill and Intangible Assets, net

3 Months Ended

Mar. 31, 2014

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, net

NOTE B – Goodwill and Intangible Assets, net

There was no change in our goodwill for the three months ended March 31, 2014.

Intangible assets included the following (in thousands):


	March 31, 2014							December 31, 2013
	Carrying		Accumulated					Carrying		Accumulated
	Amount		Amortization			Net		Amount		Amortization			Net
Subscriber relationships	$	23,160	$	(7,007	)	$	16,153	$	23,160	$	(6,376	)	$	16,784
Non-competition agreements		1,710		(1,498	)		212		1,710		(1,412	)		298

	$	24,870	$	(8,505	)	$	16,365	$	24,870	$	(7,788	)	$	17,082

Amortization expense for intangible assets was $717,000 for each of the three months ended March 31, 2014 and 2013, respectively.

At March 31, 2014, future amortization expense for intangible assets was as follows (in thousands):


Remainder of 2014	$	1,970
2015		2,578
2016		2,578
2017		2,557
2018		2,062
Thereafter		4,620

	$	16,365

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Line of Credit	3 Months Ended
Line of Credit	Mar. 31, 2014
Debt Disclosure [Abstract]
Line of Credit	NOTE C – Line of Credit We have a revolving credit agreement with JPMorgan Chase Bank, N.A. which provides for a $20 million revolving credit facility that we may draw upon from time to time, subject to certain terms and conditions, and will mature on September 30, 2016. There were no borrowings outstanding at March 31, 2014 and we were in compliance with all covenants under the revolving credit agreement as of that date.

Stock-Based Compensation

3 Months Ended

Mar. 31, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

NOTE D – Stock-Based Compensation

Our equity compensation plans provide for the grant of incentive and nonqualified stock options, as well as other stock-based awards including restricted stock and restricted stock units, to employees, non-employee directors and other consultants who provide services to us. Restricted stock awards result in the issuance of new shares when granted. For other stock-based awards, new shares are issued when the award is exercised, vested or released according to the terms of the agreement. In January 2014, 965,527 additional shares were reserved for future issuance under our 2010 Equity Incentive Plan. At March 31, 2014, there were approximately 2.6 million shares available for grant under approved equity compensation plans.

We recorded non-cash stock-based compensation expense of $1.3 million and $924,000 for the three months ended March 31, 2014 and 2013, respectively. This expense was allocated as follows (in thousands):


	Three Months Ended
	March 31,
	2014		2013
Cost of revenues	$	153	$	103
Operating expenses
Sales and marketing		482		342
Research and development		93		61
General and administrative		611		418

Total stock-based compensation expense	$	1,339	$	924

As of March 31, 2014, there was approximately $11.5 million of unrecognized stock-based compensation expense under our equity compensation plans, which is expected to be recognized on a straight line basis over a weighted average period of 3.1 years.

Stock Options

Stock options generally vest over four years and have a contractual term of seven to ten years from the date of grant. Our stock option activity was as follows:


				Weighted Average
	Options			Exercise Price
	(#)			($/share)
Outstanding at December 31, 2013		1,097,223		$	19.62
Granted		119,143			65.95
Exercised		(65,077	)		8.95
Forfeited		(9,067	)		38.94

Outstanding at March 31, 2014		1,142,222			24.91

Of the total outstanding options at March 31, 2014, 684,071 were exercisable with a weighted average exercise price of $15.74 per share. The total outstanding options had a weighted average remaining contractual life of 5.9 years.

The weighted average fair value per share of options granted during the first three months of 2014 was $26.24 and this was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:


Weighted-average volatility	44.3	%
Expected dividend yield	0	%
Expected life (in years)	4.6
Weighted-average risk-free interest rate	1.43	%

Restricted Stock Units and Awards

Restricted stock units vest over four years and, upon vesting, the holder is entitled to receive shares of our common stock. With restricted stock awards, shares of our common stock are issued when the award is granted and the restrictions lapse over one year.

Our restricted stock units activity was as follows:


	Restricted Stock			Weighted Average
	Units			Grant Date Fair
	(#)			Value ($/share)
Outstanding at December 31, 2013		102,644		$	33.77
Granted		38,236			65.95
Vested and common stock issued		(25,732	)		32.46
Forfeited		(1,145	)		35.42

Outstanding at March 31, 2014		114,003			44.84

The number of restricted stock units outstanding at March 31, 2014 included 4,942 units that have vested but for which shares of common stock have not yet been issued pursuant to the terms of the agreement.

Our restricted stock awards activity was as follows:


	Restricted Stock			Weighted Average
	Awards			Grant Date Fair
	(#)			Value ($/share)
Outstanding at December 31, 2013		1,422		$	48.66
Restricted common stock issued		—			—
Restrictions lapsed		(1,185	)		48.66
Forfeited		(237	)		48.66

Outstanding at March 31, 2014		—			—

Employee Stock Purchase Plan

Our employee stock purchase plan allows participating employees to purchase shares of our common stock at a discount through payroll deductions. The plan is available to all employees subject to certain eligibility requirements. Participating employees may purchase common stock, on a voluntary after-tax basis, at a price that is the lower of 85% of the fair market value of one share of common stock at the beginning or end of each stock purchase period. The plan consists of two six-month offering periods, beginning on January 1 and July 1 of each calendar year. A total of 1.2 million shares of common stock are reserved for issuance under the plan.

For the offering period that began on January 1, 2014, we withheld approximately $369,000 from employees participating in the plan as of March 31, 2014.

For the three months ended March 31, 2014, we recorded approximately $106,000 of stock-based compensation expense associated with the employee stock purchase plan. The fair value was estimated based on the market price of our common stock at the beginning of each offering period and using the Black-Scholes option pricing model with the following assumptions:


Expected volatility	48.9	%
Expected dividend yield	0	%
Expected life (in years)	0.50
Risk-free interest rate	0.10	%

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	NOTE E – Income Taxes We record our interim provision for income taxes by applying our estimated annual effective tax rate to our year-to-date pretax income and adjust the provision for discrete tax items recorded in the period. Differences between our effective tax rate and statutory tax rates are primarily due to the impact of meals and entertainment expense, employee stock purchase plan expense, as well as the federal R&D credit. We recorded income tax expense of $218,000 for the three months ended March 31, 2014. We recorded an income tax benefit of $66,000 for the three months ended March 31, 2013. Our provisions for income taxes included current foreign and state income tax expense, as well as deferred tax expense. We are subject to U.S federal income tax as well as income tax in various state and international jurisdictions. We are generally subject to tax examinations for all prior years due to our net operating loss carryforwards. As of March 31, 2014, we were not under any income tax audits by tax authorities. As of March 31, 2014 we do not have any unrecognized tax benefits. It is our practice to recognize interest and penalties accrued on any unrecognized tax benefits as a component of income tax expense. We do not expect any material changes in our unrecognized tax positions over the next 12 months.

Net Income Per Share

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Net Income Per Share

NOTE F – Net Income Per Share

Basic net income per share has been computed using the weighted average number of shares of common stock outstanding during each period. Diluted net income per share also includes the impact of our outstanding potential common shares, including options and restricted stock units. Potential common shares that are anti-dilutive are excluded from the calculation of diluted net income per share.

The following table presents the components of the computation of basic and diluted net income per share for the periods indicated (in thousands, except per share amounts):


	Three Months Ended
	March 31,
	2014		2013
Numerator
Net income	$	373	$	199

Denominator
Weighted average common shares outstanding, basic		16,155		14,884
Options to purchase common stock		616		627
Restricted stock units		57		51
Employee stock purchase plan		2		2

Weighted average common shares outstanding, diluted		16,830		15,564

Net income per share
Basic	$	0.02	$	0.01

Diluted	$	0.02	$	0.01

The effect of approximately 120,000 and 201,000 outstanding potential common shares was excluded from the calculation of diluted net income per share for the three months ended March 31, 2014 and 2013, respectively.

General (Policies)	3 Months Ended
General (Policies)	Mar. 31, 2014
Accounting Policies [Abstract]
Business Description	Business Description We are a leading provider of cloud-based supply chain management solutions, providing prewired, proven integrations and comprehensive retail performance analytics to thousands of customers worldwide. We provide our solutions through the SPS Commerce platform, a cloud-based software suite that improves the way suppliers, retailers, distributors and other customers manage and fulfill orders. We derive the majority of our revenues from thousands of monthly recurring subscriptions from businesses that utilize our solutions.
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of SPS Commerce, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in the condensed consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, these condensed consolidated financial statements do not include all of the information and notes required by GAAP. We have included all normal recurring adjustments considered necessary to give a fair statement of our financial position, results of operations and cash flows for the interim periods shown. Operating results for these interim periods are not necessarily indicative of the results to be expected for the full year. The December 31, 2013 condensed consolidated balance sheet data was derived from our audited financial statements at that date. For further information, refer to the consolidated financial statements and accompanying notes for the year ended December 31, 2013 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on February 20, 2014.
Use of Estimates	Use of Estimates Preparing financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.
Significant Accounting Policies	Significant Accounting Policies During the three months ended March 31, 2014, there were no material changes in our significant accounting policies. See Note A to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2013, as filed with the Securities and Exchange Commission on February 20, 2014, for additional information regarding our significant accounting policies.
Recent Accounting Pronouncements	Recent Accounting Pronouncements We have evaluated all recent accounting pronouncements and believe that none of them will have a material effect on our consolidated financial statements.

Goodwill and Intangible Assets, net (Tables)

3 Months Ended

Mar. 31, 2014

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible assets included the following (in thousands):


	March 31, 2014							December 31, 2013
	Carrying		Accumulated					Carrying		Accumulated
	Amount		Amortization			Net		Amount		Amortization			Net
Subscriber relationships	$	23,160	$	(7,007	)	$	16,153	$	23,160	$	(6,376	)	$	16,784
Non-competition agreements		1,710		(1,498	)		212		1,710		(1,412	)		298

	$	24,870	$	(8,505	)	$	16,365	$	24,870	$	(7,788	)	$	17,082

Future Amortization Expense for Intangible Assets

At March 31, 2014, future amortization expense for intangible assets was as follows (in thousands):


Remainder of 2014	$	1,970
2015		2,578
2016		2,578
2017		2,557
2018		2,062
Thereafter		4,620

	$	16,365

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2014

Stock-Based Compensation Expense

This expense was allocated as follows (in thousands):


	Three Months Ended
	March 31,
	2014		2013
Cost of revenues	$	153	$	103
Operating expenses
Sales and marketing		482		342
Research and development		93		61
General and administrative		611		418

Total stock-based compensation expense	$	1,339	$	924

Stock Option Activity

Our stock option activity was as follows:


				Weighted Average
	Options			Exercise Price
	(#)			($/share)
Outstanding at December 31, 2013		1,097,223		$	19.62
Granted		119,143			65.95
Exercised		(65,077	)		8.95
Forfeited		(9,067	)		38.94

Outstanding at March 31, 2014		1,142,222			24.91

Weighted Average Fair Value Per Share of Options Granted, Assumptions


Weighted-average volatility	44.3	%
Expected dividend yield	0	%
Expected life (in years)	4.6
Weighted-average risk-free interest rate	1.43	%

Weighted Average Fair Value Per Share, Employee Stock Purchase Plan, Assumptions

The fair value was estimated based on the market price of our common stock at the beginning of each offering period and using the Black-Scholes option pricing model with the following assumptions:


Expected volatility	48.9	%
Expected dividend yield	0	%
Expected life (in years)	0.50
Risk-free interest rate	0.10	%

Restricted Stock Units [Member]

Restricted Stock Units and Restricted Stock Awards

Our restricted stock units activity was as follows:


	Restricted Stock			Weighted Average
	Units			Grant Date Fair
	(#)			Value ($/share)
Outstanding at December 31, 2013		102,644		$	33.77
Granted		38,236			65.95
Vested and common stock issued		(25,732	)		32.46
Forfeited		(1,145	)		35.42

Outstanding at March 31, 2014		114,003			44.84

Restricted Stock Award [Member]

Restricted Stock Units and Restricted Stock Awards

Our restricted stock awards activity was as follows:


	Restricted Stock			Weighted Average
	Awards			Grant Date Fair
	(#)			Value ($/share)
Outstanding at December 31, 2013		1,422		$	48.66
Restricted common stock issued		—			—
Restrictions lapsed		(1,185	)		48.66
Forfeited		(237	)		48.66

Outstanding at March 31, 2014		—			—

Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Components of Computation of Basic and Diluted Net Income Per Share

The following table presents the components of the computation of basic and diluted net income per share for the periods indicated (in thousands, except per share amounts):


	Three Months Ended
	March 31,
	2014		2013
Numerator
Net income	$	373	$	199

Denominator
Weighted average common shares outstanding, basic		16,155		14,884
Options to purchase common stock		616		627
Restricted stock units		57		51
Employee stock purchase plan		2		2

Weighted average common shares outstanding, diluted		16,830		15,564

Net income per share
Basic	$	0.02	$	0.01

Diluted	$	0.02	$	0.01

Goodwill and Intangible Assets, Net - Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	$ 24,870	$ 24,870
Accumulated Amortization	(8,505)	(7,788)
Net	16,365	17,082
Subscriber relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	23,160	23,160
Accumulated Amortization	(7,007)	(6,376)
Net	16,153	16,784
Non-competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	1,710	1,710
Accumulated Amortization	(1,498)	(1,412)
Net	$ 212	$ 298

Goodwill and Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 717	$ 717

Goodwill and Intangible Assets, Net - Future Amortization Expense for Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2014	$ 1,970
2015	2,578
2016	2,578
2017	2,557
2018	2,062
Thereafter	4,620
Net	$ 16,365	$ 17,082

Line of Credit - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2014 USD ($)
Line of Credit Facility [Line Items]
Revolving credit facility, amount	$ 20
Revolving credit facility, maturity date	Sep. 30, 2016
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowings outstanding revolving credit agreement	$ 0

Stock-Based Compensation - Additional Information (Detail)	1 Months Ended	3 Months Ended
	Jan. 31, 2014 shares	Mar. 31, 2014 USD ($) OfferingPeriods $ / shares shares	Mar. 31, 2013 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant		2,600,000
Stock-based compensation expense \| $		$ 1,339,000	$ 924,000
Unrecognized stock-based compensation expense \| $		$ 11,500,000
Unrecognized stock-based compensation, expected to be recognized, weighted average period		3 years 1 month 6 days
Stock options vest, period		4 years
Stock options contractual term, from the date of grant		Seven to ten years
Stock options exercisable		684,071
Weighted average exercise price \| $ / shares		$ 15.74
Weighted average remaining contractual life		5 years 10 months 24 days
Weighted average fair value per share of options granted \| $ / shares		$ 26.24
Number of RSU's vested and not issued during the period		4,942
Percentage of common stock on fair market value		85.00%
Number of offerings per year \| OfferingPeriods		2
Employee stock purchase plan, employees contribution \| $		$ 369,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 106,000
Common stock reserved for future issuance		1,200,000
Equity Incentive Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares were authorized under 2010 Equity Incentive Plan	965,527
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vest, period		4 years
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards units vest over, period		1 year
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options contractual term Range		10 years
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options contractual term Range		7 years

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,339	$ 924
Cost of revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	153	103
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	482	342
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	93	61
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 611	$ 418

Stock-Based Compensation - Stock Option Activity (Detail)	3 Months Ended
	Mar. 31, 2014 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, Beginning balance \| shares	1,097,223
Options, Granted \| shares	119,143
Options, Exercised \| shares	(65,077)
Options, Forfeited \| shares	(9,067)
Options Outstanding, Ending balance \| shares	1,142,222
Weighted Average Exercise Price, Outstanding, Beginning Balance \| $ / shares	$ 19.62
Weighted Average Exercise Price, Granted \| $ / shares	65.95
Weighted Average Exercise Price, Exercised \| $ / shares	8.95
Weighted Average Exercise Price, Forfeited \| $ / shares	38.94
Weighted Average Exercise Price, Outstanding, Ending Balance \| $ / shares	$ 24.91

Stock-Based Compensation - Weighted Average Fair Value Per Share of Options Granted, Assumptions (Detail) - Stock Options [Member]	3 Months Ended
	Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Weighted-average volatility	44.30%
Expected dividend yield	0.00%
Expected life (in years)	4 years 7 months 6 days
Weighted-average risk-free interest rate	1.43%

Stock-Based Compensation - Restricted Stock Units (Detail) - Restricted Stock Units [Member]	3 Months Ended
	Mar. 31, 2014 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding, Beginning Balance \| shares	102,644
Granted, stock units \| shares	38,236
Vested, stock units \| shares	(25,732)
Forfeited, stock units \| shares	(1,145)
Stock awards, Outstanding, Ending Balance \| shares	114,003
Weighted average grant date fair value, Outstanding, Beginning Balance \| $ / shares	$ 33.77
Granted, Weighted Average Grant Date Fair Value \| $ / shares	65.95
Vested, Weighted Average Grant Date Fair Value \| $ / shares	32.46
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	35.42
Weighted average grant date fair value, Outstanding, Ending Balance \| $ / shares	$ 44.84

Stock-Based Compensation - Restricted Stock Awards (Detail) - Restricted Stock Award [Member]	3 Months Ended
	Mar. 31, 2014 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding, Beginning Balance \| shares	1,422
Restricted common stock issued, stock awards \| shares
Restrictions lapsed, stock awards \| shares	(1,185)
Forfeited, stock awards \| shares	(237)
Weighted average grant date fair value, Outstanding, Beginning Balance	$ 48.66
Restricted common stock issued, Weighted Average Grant Date Fair Value
Restrictions lapsed, Weighted Average Grant Date Fair Value	48.66
Forfeited, Weighted Average Grant Date Fair Value	48.66
Weighted average grant date fair value, Outstanding, Ending Balance

Stock-Based Compensation - Fair Value Estimation of Common Stock Using Black-Scholes Option Pricing Model, Assumptions (Detail) - Employee Stock Purchase Plan [Member]	3 Months Ended
	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	48.90%
Expected dividend yield	0.00%
Expected life (in years)	6 months
Risk-free interest rate	0.10%

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Income tax benefit (expense)	$ (218,000)	$ 66,000
Unrecognized tax benefits	0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 0

Net Income Per Share - Components of Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator
Net income	$ 373	$ 199
Denominator
Weighted average common shares outstanding, basic	16,155	14,884
Options to purchase common stock	616	627
Restricted stock units	57	51
Employee stock purchase plan	2	2
Weighted average common shares outstanding, diluted	16,830	15,564
Net income per share
Basic	$ 0.02	$ 0.01
Diluted	$ 0.02	$ 0.01

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Outstanding potential common shares excluded from computation of net income per share	120,000	201,000