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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2013	Oct. 22, 2013
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Trading Symbol	SPSC
Entity Registrant Name	SPS COMMERCE INC
Entity Central Index Key	0001092699
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		15,273,370

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 80,813	$ 66,050
Accounts receivable, less allowance for doubtful accounts of $243 and $227, respectively	11,148	10,940
Deferred costs, current	8,699	7,346
Deferred income taxes, current	1,732	1,732
Prepaid expenses and other current assets	2,848	5,443
Total current assets	105,240	91,511
PROPERTY AND EQUIPMENT, net	10,557	7,670
GOODWILL	25,487	25,487
INTANGIBLE ASSETS, net	17,799	20,240
OTHER ASSETS
Deferred costs, net of current portion	3,619	3,202
Deferred income taxes, net of current portion	10,698	10,853
Other non-current assets	190	238
Total assets	173,590	159,201
CURRENT LIABILITIES
Accounts payable	1,685	1,857
Accrued compensation and benefits	8,404	6,038
Accrued expenses and other current liabilities	2,665	1,077
Deferred revenue, current	6,452	5,499
Total current liabilities	19,206	14,471
OTHER LIABILITIES
Deferred revenue, less current portion	8,765	8,312
Deferred rent	3,239	1,601
Total liabilities	31,210	24,384
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; 15,271,191 and 14,812,759 shares issued and outstanding, respectively	15	15
Additional paid-in capital	189,451	182,645
Accumulated deficit	(47,086)	(47,843)
Total stockholders' equity	142,380	134,817
Total liabilities and stockholder's equity	$ 173,590	$ 159,201

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 243	$ 227
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	15,271,191	14,812,759
Common stock, shares outstanding	15,271,191	14,812,759

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Revenues	$ 27,008	$ 20,267	$ 76,418	$ 54,622
Cost of revenues	8,249	5,945	23,258	15,236
Gross profit	18,759	14,322	53,160	39,386
Operating expenses
Sales and marketing	10,291	7,840	29,163	21,259
Research and development	2,806	2,088	7,966	5,650
General and administrative	4,284	3,726	12,542	10,079
Amortization of intangible assets	1,007	530	2,441	1,050
Total operating expenses	18,388	14,184	52,112	38,038
Income from operations	371	138	1,048	1,348
Other income (expense)
Interest expense		(27)		(27)
Interest income	31	6	76	34
Other income (expense)	37	(67)	(95)	(170)
Total other income (expense), net	68	(88)	(19)	(163)
Income before income taxes	439	50	1,029	1,185
Income tax (expense) benefit	(169)	124	(272)	(329)
Net income	$ 270	$ 174	$ 757	$ 856
Net income per share
Basic	$ 0.02	$ 0.01	$ 0.05	$ 0.07
Diluted	$ 0.02	$ 0.01	$ 0.05	$ 0.06
Weighted average common shares used to compute net income per share
Basic	15,223	13,042	15,064	12,500
Diluted	15,986	13,894	15,781	13,373

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities
Net income	$ 757	$ 856
Reconciliation of net income to net cash provided by operating activities
Deferred income taxes	155	220
Depreciation and amortization of property and equipment	3,586	2,117
Amortization of intangible assets	2,441	1,050
Provision for doubtful accounts	315	295
Stock-based compensation	3,120	2,042
Changes in assets and liabilities
Accounts receivable	(523)	(1,184)
Deferred costs	(1,770)	(1,675)
Prepaid expenses and other current assets	2,643	(484)
Accounts payable	(172)	1,328
Accrued compensation and benefits	2,366	1,516
Accrued expenses and other current liabilities	145	179
Deferred rent	1,638
Deferred revenue	1,406	2,006
Net cash provided by operating activities	16,107	8,266
Cash flows from investing activities
Purchases of property and equipment	(5,030)	(2,845)
Business acquisitions, net of cash acquired		(26,262)
Net cash used in investing activities	(5,030)	(29,107)
Cash flows from financing activities
Net proceeds from exercise of options to purchase common stock	3,095	1,137
Excess tax benefit from exercise of options to purchase common stock	40	24
Net proceeds from employee stock purchase plan	551
Payments of capital lease obligations		(410)
Proceeds from common stock offering		57,940
Stock offering costs		(120)
Net cash provided by financing activities	3,686	58,571
Net increase in cash and cash equivalents	14,763	37,730
Cash and cash equivalents at beginning of period	66,050	31,985
Cash and cash equivalents at end of period	$ 80,813	$ 69,715

General	9 Months Ended
General	Sep. 30, 2013
Accounting Policies [Abstract]
General	NOTE A – General Business Description We are a leading provider of on-demand 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 deliver our solutions to our customers over the Internet using a Software-as-a-Service model and 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 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, 2012 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, 2012 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on March 6, 2013. 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 nine months ended September 30, 2013, 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, 2012, as filed with the Securities and Exchange Commission on March 6, 2013, 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

Intangible Assets, net

9 Months Ended

Sep. 30, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets, net

NOTE B – Intangible Assets, net

Intangible assets included the following (in thousands):


	September 30, 2013							December 31, 2012
	Carrying		Accumulated					Carrying		Accumulated
	Amount		Amortization			Net		Amount		Amortization			Net
Subscriber relationships	$	23,160	$	(5,744	)	$	17,416	$	23,160	$	(3,850	)	$	19,310
Non-competition agreements		1,710		(1,327	)		383		1,710		(780	)		930

	$	24,870	$	(7,071	)	$	17,799	$	24,870	$	(4,630	)	$	20,240

Amortization expense for intangible assets was $1.0 million and $2.4 million for the three and nine months ended September 30, 2013, and $530,000 and $1.1 million for the three and nine months ended September 30, 2012, respectively.

Amortization expense for the three and nine months ended September 30, 2013 included $290,000 for the impairment of a certain non-competition agreement.

At September 30, 2013, future amortization expense for intangible assets was as follows (in thousands):


Remainder of 2013	$	717
2014		2,688
2015		2,578
2016		2,577
2017		2,557
Thereafter		6,682

	$	17,799

Line of Credit	9 Months Ended
Line of Credit	Sep. 30, 2013
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 September 30, 2013 and we were in compliance with all covenants under the revolving credit agreement as of that date.

Accrued Expenses and Other Current Liabilities	9 Months Ended
Accrued Expenses and Other Current Liabilities	Sep. 30, 2013
Payables And Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	NOTE D – Accrued Expenses and Other Current Liabilities In the second quarter of 2013, we entered into an agreement to purchase software licenses. At September 30, 2013, our future payments under this agreement, which are included in accrued expenses and other current liabilities in our consolidated balance sheets, were approximately $1.4 million for 2014.

Stock-Based Compensation

9 Months Ended

Sep. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

NOTE E – 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, 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 2013, 888,765 additional shares were reserved for future issuance under our 2010 Equity Incentive Plan. At September 30, 2013, there were approximately 1.8 million shares available for grant under approved equity compensation plans.

We recorded non-cash stock-based compensation expense of $1.1 million and $3.1 million for the three and nine months ended September 30, 2013, respectively, and $715,000 and $2.0 million for the three and nine months ended September 30, 2012, respectively. This expense was allocated as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Cost of revenues	$	128	$	122	$	353	$	336
Operating expenses
Sales and marketing		378		232		1,106		627
Research and development		71		39		195		90
General and administrative		508		322		1,466		989

Total stock-based compensation expense	$	1,085	$	715	$	3,120	$	2,042

As of September 30, 2013, there was approximately $8.2 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 2.7 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:


	Options (#)			Weighted Average Exercise Price ($/share)
Outstanding at December 31, 2012		1,370,141		$	12.41
Granted		224,276			40.45
Exercised		(413,023	)		7.46
Forfeited		(28,052	)		30.77

Outstanding at September 30, 2013		1,153,342			19.19

Of the total outstanding options at September 30, 2013, 640,625 were exercisable with a weighted average exercise price of $12.27 per share. The total outstanding options had a weighted average remaining contractual life of 6.1 years.

The weighted average fair value per share of options granted during the first nine months of 2013 was $14.53 and this was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:


Weighted-average volatility	41.1	%
Expected dividend yield	0	%
Expected life (in years)	4.75
Weighted-average risk-free interest rate	0.86	%

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 Units (#)			Weighted Average Grant Date Fair Value ($/share)
Outstanding at December 31, 2012		68,241		$	26.35
Granted		59,309			39.83
Vested and common stock issued		(17,060	)		26.11
Forfeited		(8,232	)		33.85

Outstanding at September 30, 2013		102,258			34.14

The number of restricted stock units outstanding at September 30, 2013 included 7,142 units that have vested but 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 Awards (#)			Weighted Average Grant Date Fair Value ($/share)
Outstanding at December 31, 2012		5,275		$	27.55
Restricted common stock issued		5,688			48.66
Restrictions lapsed		(8,119	)		34.94
Forfeited		—			—

Outstanding at September 30, 2013		2,844			48.66

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, 2013 and ended June 30, 2013, we withheld approximately $551,000 from employees participating in the plan. On June 30, 2013, 17,386 shares were purchased on behalf of the employees participating in the plan and approximately 1.2 million shares were available for future purchases. For the offering period that began on July 1, 2013 and will end on December 31, 2013, we have withheld approximately $337,000 from employees participating in the plan as of September 30, 2013.

For the three and nine months ended September 30, 2013, we recorded approximately $116,000 and $299,000 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	41.1	%
Expected dividend yield	0	%
Expected life (in years)	0.50
Risk-free interest rate	0.12	%

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	NOTE F – Income Taxes We recorded income tax expense of $169,000 and $272,000 for the three and nine months ended September 30, 2013. We recorded an income tax benefit of $124,000 and income tax expense of $329,000 for the three and nine months ended September 30, 2012, respectively. We record our interim provision for income taxes based on our estimated annual effective tax rate for the year. 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 and the federal R&D credit. Our provisions for income taxes included current foreign and state income tax expense, as well as deferred tax expense. Income tax expense for the nine months ended September 30, 2013 included a discrete tax benefit of $117,000 in 2013 for the retroactive benefit of the 2012 federal R&D credit. The American Taxpayer Relief Act of 2012 was enacted on January 2, 2013 and extended the federal R&D credit from January 1, 2012 through December 31, 2013. We are subject to income taxes in the U.S. federal and various state and international jurisdictions. As of September 30, 2013, we are generally subject to tax examinations for all prior years due to our net operating loss carryforwards. As of September 30, 2013, 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

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Net Income Per Share

NOTE G – 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 September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Numerator
Net income	$	270	$	174	$	757	$	856

Denominator
Weighted average common shares outstanding, basic		15,223		13,042		15,064		12,500
Options to purchase common stock		706		821		666		846
Restricted stock units		54		29		48		26
Employee stock purchase plan		3		2		3		1

Weighted average common shares outstanding, diluted		15,986		13,894		15,781		13,373

Net income per share
Basic	$	0.02	$	0.01	$	0.05	$	0.07

Diluted	$	0.02	$	0.01	$	0.05	$	0.06

For each of the three and nine months ended September 30, 2013 and September 30, 2012, the effect of all outstanding potential common shares was included in the calculation of diluted net income per share.

General (Policies)	9 Months Ended
General (Policies)	Sep. 30, 2013
Accounting Policies [Abstract]
Business Description	Business Description We are a leading provider of on-demand 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 deliver our solutions to our customers over the Internet using a Software-as-a-Service model and 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 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, 2012 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, 2012 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on March 6, 2013.
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 nine months ended September 30, 2013, 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, 2012, as filed with the Securities and Exchange Commission on March 6, 2013, 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.

Intangible Assets, net (Tables)

9 Months Ended

Sep. 30, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible assets included the following (in thousands):


	September 30, 2013							December 31, 2012
	Carrying		Accumulated					Carrying		Accumulated
	Amount		Amortization			Net		Amount		Amortization			Net
Subscriber relationships	$	23,160	$	(5,744	)	$	17,416	$	23,160	$	(3,850	)	$	19,310
Non-competition agreements		1,710		(1,327	)		383		1,710		(780	)		930

	$	24,870	$	(7,071	)	$	17,799	$	24,870	$	(4,630	)	$	20,240

Future Amortization Expense for Intangible Assets

At September 30, 2013, future amortization expense for intangible assets was as follows (in thousands):


Remainder of 2013	$	717
2014		2,688
2015		2,578
2016		2,577
2017		2,557
Thereafter		6,682

	$	17,799

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

Stock-Based Compensation Expense

This expense was allocated as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Cost of revenues	$	128	$	122	$	353	$	336
Operating expenses
Sales and marketing		378		232		1,106		627
Research and development		71		39		195		90
General and administrative		508		322		1,466		989

Total stock-based compensation expense	$	1,085	$	715	$	3,120	$	2,042

Stock Option Activity

Our stock option activity was as follows:


	Options (#)			Weighted Average Exercise Price ($/share)
Outstanding at December 31, 2012		1,370,141		$	12.41
Granted		224,276			40.45
Exercised		(413,023	)		7.46
Forfeited		(28,052	)		30.77

Outstanding at September 30, 2013		1,153,342			19.19

Weighted Average Fair Value Per Share of Options Granted, Assumptions


Weighted-average volatility	41.1	%
Expected dividend yield	0	%
Expected life (in years)	4.75
Weighted-average risk-free interest rate	0.86	%

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	41.1	%
Expected dividend yield	0	%
Expected life (in years)	0.50
Risk-free interest rate	0.12	%

Restricted Stock Units [Member]

Restricted Stock Units and Restricted Stock Awards

Our restricted stock units activity was as follows:


	Restricted Stock Units (#)			Weighted Average Grant Date Fair Value ($/share)
Outstanding at December 31, 2012		68,241		$	26.35
Granted		59,309			39.83
Vested and common stock issued		(17,060	)		26.11
Forfeited		(8,232	)		33.85

Outstanding at September 30, 2013		102,258			34.14

Restricted Stock Award [Member]

Restricted Stock Units and Restricted Stock Awards

Our restricted stock awards activity was as follows:


	Restricted Stock Awards (#)			Weighted Average Grant Date Fair Value ($/share)
Outstanding at December 31, 2012		5,275		$	27.55
Restricted common stock issued		5,688			48.66
Restrictions lapsed		(8,119	)		34.94
Forfeited		—			—

Outstanding at September 30, 2013		2,844			48.66

Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2013

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 September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Numerator
Net income	$	270	$	174	$	757	$	856

Denominator
Weighted average common shares outstanding, basic		15,223		13,042		15,064		12,500
Options to purchase common stock		706		821		666		846
Restricted stock units		54		29		48		26
Employee stock purchase plan		3		2		3		1

Weighted average common shares outstanding, diluted		15,986		13,894		15,781		13,373

Net income per share
Basic	$	0.02	$	0.01	$	0.05	$	0.07

Diluted	$	0.02	$	0.01	$	0.05	$	0.06

Intangible Assets, Net - Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	$ 24,870	$ 24,870
Accumulated Amortization	(7,071)	(4,630)
Net	17,799	20,240
Subscriber relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	23,160	23,160
Accumulated Amortization	(5,744)	(3,850)
Net	17,416	19,310
Non-competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	1,710	1,710
Accumulated Amortization	(1,327)	(780)
Net	$ 383	$ 930

Intangible Assets, Net - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 1,007,000	$ 530,000	$ 2,441,000	$ 1,050,000
Impairment of non-competition agreements	$ 290,000		$ 290,000

Intangible Assets, Net - Future Amortization Expense for Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2013	$ 717
2014	2,688
2015	2,578
2016	2,577
2017	2,557
Thereafter	6,682
Net	$ 17,799	$ 20,240

Line of Credit - Additional Information (Detail)	9 Months Ended
Line of Credit - Additional Information (Detail)	Sep. 30, 2013 USD ($)
Debt Disclosure [Abstract]
Revolving credit facility, amount	$ 20,000,000
Revolving credit facility, maturity date	Sep. 30, 2016
Borrowings outstanding revolving credit agreement	$ 0

Accrued Expenses and Other Current Liabilities - Additional Information (Detail) $ in Millions	Sep. 30, 2013 USD ($)
Software And Licenses [Member]
Accrued Expenses And Other Current Liabilities [Line Items]
Future payments for next fiscal year	$ 1.4

Stock-Based Compensation - Additional Information (Detail)	1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended
	Jan. 31, 2013 shares	Sep. 30, 2013 USD ($) $ / shares shares	Sep. 30, 2012 USD ($)	Jun. 30, 2013 USD ($) shares	Sep. 30, 2013 USD ($) OfferingPeriods $ / shares shares	Sep. 30, 2012 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant		1,800,000			1,800,000
Stock-based compensation expense \| $		$ 1,085,000	$ 715,000		$ 3,120,000	$ 2,042,000
Unrecognized stock-based compensation expense \| $		$ 8,200,000			$ 8,200,000
Unrecognized stock-based compensation, expected to be recognized, weighted average period					2 years 8 months 12 days
Stock options vest, period					4 years
Stock options contractual term, from the date of grant					Seven to ten years
Stock options exercisable		640,625			640,625
Weighted average exercise price \| $ / shares		$ 12.27			$ 12.27
Weighted average remaining contractual life					6 years 1 month 6 days
Weighted average fair value per share of options granted \| $ / shares					$ 14.53
Percentage of common stock on fair market value					85.00%
Number of offerings per year \| OfferingPeriods					2
Employee stock purchase plan, employees contribution \| $		$ 337,000		$ 551,000	$ 337,000
Employee stock purchase plan, shares purchased				17,386
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units vest over, period					4 years
Number of RSU's vested and not issued during the period					7,142
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
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 116,000			$ 299,000
Common stock reserved for future issuance		1,200,000			1,200,000
Common stock available for future purchases				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	888,765

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,085	$ 715	$ 3,120	$ 2,042
Cost of revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	128	122	353	336
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	378	232	1,106	627
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	71	39	195	90
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 508	$ 322	$ 1,466	$ 989

Stock-Based Compensation - Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2013 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding at December 31, 2012 \| shares	1,370,141
Options, Granted \| shares	224,276
Options, Exercised \| shares	(413,023)
Options, Forfeited \| shares	(28,052)
Options Outstanding at September 30, 2013 \| shares	1,153,342
Weighted Average Exercise Price, Outstanding at December 31, 2012 \| $ / shares	$ 12.41
Weighted Average Exercise Price, Granted \| $ / shares	40.45
Weighted Average Exercise Price, Exercised \| $ / shares	7.46
Weighted Average Exercise Price, Forfeited \| $ / shares	30.77
Weighted Average Exercise Price, Outstanding at September 30, 2013 \| $ / shares	$ 19.19

Stock-Based Compensation - Weighted Average Fair Value Per Share of Options Granted (Detail) - Stock Options [Member]	9 Months Ended
	Sep. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Weighted-average volatility	41.10%
Expected dividend yield	0.00%
Expected life (in years)	4 years 9 months
Weighted-average risk-free interest rate	0.86%

Stock-Based Compensation - Restricted Stock Units (Detail) - Restricted Stock Units [Member]	9 Months Ended
	Sep. 30, 2013 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding at December 31, 2012 \| shares	68,241
Granted, stock units \| shares	59,309
Vested, stock units \| shares	(17,060)
Forfeited, stock units \| shares	(8,232)
Stock awards, Outstanding at September 30, 2013 \| shares	102,258
Weighted average grant date fair value, Outstanding at December 31, 2012 \| $ / shares	$ 26.35
Granted, Weighted Average Grant Date Fair Value \| $ / shares	39.83
Vested, Weighted Average Grant Date Fair Value \| $ / shares	26.11
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	33.85
Weighted average grant date fair value, Outstanding at September 30, 2013 \| $ / shares	$ 34.14

Stock-Based Compensation - Restricted Stock Awards (Detail) - Restricted Stock Award [Member]	9 Months Ended
	Sep. 30, 2013 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding at December 31, 2012 \| shares	5,275
Restricted common stock issued, stock awards \| shares	5,688
Restrictions lapsed, stock awards \| shares	(8,119)
Forfeited, stock awards \| shares
Stock awards, Outstanding at September 30, 2013 \| shares	2,844
Weighted average grant date fair value, Outstanding at December 31, 2012 \| $ / shares	$ 27.55
Restricted common stock issued, Weighted Average Grant Date Fair Value \| $ / shares	48.66
Restrictions lapsed, Weighted Average Grant Date Fair Value \| $ / shares	34.94
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares
Weighted average grant date fair value, Outstanding at September 30, 2013 \| $ / shares	$ 48.66

Stock-Based Compensation - Fair Value Estimation of Common Stock Using Black-Scholes Option Pricing Model, Assumptions (Detail) - Employee Stock Purchase Plan [Member]	9 Months Ended
	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	41.10%
Expected dividend yield	0.00%
Expected life (in years)	6 months
Risk-free interest rate	0.12%

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income tax benefit (expense)	$ (169,000)	$ 124,000	$ (272,000)	$ (329,000)
State deferred tax	117,000		117,000
Unrecognized tax benefits	0		0
Material changes in our unrecognized tax positions over the next 12 months	$ 0		$ 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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator
Net income	$ 270	$ 174	$ 757	$ 856
Denominator
Weighted average common shares outstanding, basic	15,223	13,042	15,064	12,500
Options to purchase common stock	706	821	666	846
Restricted stock units	54	29	48	26
Employee stock purchase plan	3	2	3	1
Weighted average common shares outstanding, diluted	15,986	13,894	15,781	13,373
Net income per share
Basic	$ 0.02	$ 0.01	$ 0.05	$ 0.07
Diluted	$ 0.02	$ 0.01	$ 0.05	$ 0.06