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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2012	Jul. 26, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	SPS COMMERCE INC
Entity Central Index Key	0001092699
Document Type	10-Q
Document Period End Date	Jun. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		12,402,001

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
CURRENT ASSETS
Cash and cash equivalents	$ 35,501	$ 31,985
Accounts receivable, less allowance for doubtful accounts of $288 and $222, respectively	9,029	7,958
Deferred costs, current	6,509	5,748
Deferred income taxes, current	782	783
Prepaid expenses and other current assets	1,604	1,765
Total current assets	53,425	48,239
PROPERTY AND EQUIPMENT, net	4,028	3,382
GOODWILL	5,853	5,853
INTANGIBLE ASSETS, net	5,247	5,767
OTHER ASSETS
Deferred costs, net of current portion	2,885	2,510
Deferred income taxes, net of current portion	11,424	11,787
Other non-current assets	84	80
Total assets	82,946	77,618
CURRENT LIABILITIES
Accounts payable	1,944	1,411
Accrued compensation and benefits	4,806	5,118
Accrued expenses and other current liabilities	1,560	1,097
Deferred revenue, current	4,366	3,840
Total current liabilities	12,676	11,466
OTHER LIABILITIES
Deferred revenue, less current portion	7,873	6,599
Total liabilities	20,549	18,065
COMMITMENTS and CONTINGENCIES
STOCKHOLDER'S 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; 12,386,417 and 12,138,858 shares issued and outstanding, respectively	12	12
Additional paid-in capital	110,768	108,606
Accumulated deficit	(48,383)	(49,065)
Total stockholders' equity	62,397	59,553
Total liabilities and stockholder's equity	$ 82,946	$ 77,618

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, less allowance for doubtful accounts	$ 288	$ 222
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	12,386,417	12,138,858
Common stock, shares outstanding	12,386,417	12,138,858

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]
Revenues	$ 17,821	$ 13,937	$ 34,355	$ 26,586
Cost of revenues	4,843	3,750	9,291	7,071
Gross profit	12,978	10,187	25,064	19,515
Operating expenses
Sales and marketing	6,972	5,852	13,419	10,978
Research and development	1,830	1,414	3,562	2,654
General and administrative	3,165	2,839	6,353	5,294
Amortization of intangible assets	260	123	520	123
Total operating expenses	12,227	10,228	23,854	19,049
Income (loss) from operations	751	(41)	1,210	466
Other income (expense)
Interest income	13	26	28	58
Other expense	(38)	(16)	(103)	(34)
Total other income (expense), net	(25)	10	(75)	24
Income (loss) before income taxes	726	(31)	1,135	490
Income tax expense	(300)	(78)	(453)	(107)
Net income (loss)	$ 426	$ (109)	$ 682	$ 383
Net income (loss) per share
Basic	$ 0.03	$ (0.01)	$ 0.06	$ 0.03
Diluted	$ 0.03	$ (0.01)	$ 0.05	$ 0.03
Weighted average common shares used to compute net income (loss) per share
Basic	12,284	11,919	12,224	11,892
Diluted	13,026	11,919	13,106	12,659

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities
Net income	$ 682	$ 383
Reconciliation of net income to net cash provided by operating activities
Deferred income taxes	364
Depreciation and amortization of property and equipment	1,244	895
Amortization of intangible assets	520	123
Provision for doubtful accounts	164	120
Stock-based compensation	1,327	799
Changes in assets and liabilities, net of effect of acquisition
Accounts receivable	(1,235)	(1,799)
Deferred costs	(1,136)	(708)
Prepaid expenses and other current assets	157	(593)
Accounts payable	533	823
Accrued compensation and benefits	(312)	259
Accrued expenses and other current liabilities	463	216
Deferred revenue	1,800	608
Net cash provided by operating activities	4,571	1,126
Cash flows from investing activities
Purchases of property and equipment	(1,890)	(989)
Acquisition of Direct EDI		(10,865)
Net cash used in investing activities	(1,890)	(11,854)
Cash flows from financing activities
Payments of capital lease obligations		(122)
Net proceeds from exercise of options to purchase common stock	811	273
Excess tax benefit from exercise of options to purchase common stock	24
Stock offering costs		(108)
Net cash provided by financing activities	835	43
Net increase (decrease) in cash and cash equivalents	3,516	(10,685)
Cash and cash equivalents at beginning of period	31,985	40,473
Cash and cash equivalents at end of period	$ 35,501	$ 29,788

General

6 Months Ended

Jun. 30, 2012

General and Financial Statement Components [Abstract]

General

NOTE A – General

Business Description

We are a leading provider of on-demand supply chain management solutions and the Retail Universe community, providing integration, collaboration, connectivity, visibility and data analytics to thousands of customers worldwide. We provide our solutions through SPSCommerce.net, a hosted 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 footnotes 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, 2011 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, 2011 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on March 9, 2012.

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 six months ended June 30, 2012, 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, 2011, as filed with the Securities and Exchange Commission on March 9, 2012, 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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-Name Statement of Position (SOP)
-Number 94-6
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-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
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+ Details

Financial Statement Components

6 Months Ended

Jun. 30, 2012

General and Financial Statement Components [Abstract]

Financial Statement Components

NOTE B – Financial Statement Components

Intangible Assets, net

Intangible assets included the following (in thousands):


	June 30, 2012							December 31, 2011
	Carrying Amount		Accumulated Amortization			Net		Carrying Amount		Accumulated Amortization			Net

Subscriber relationships	$	7,180	$	(2,769	)	$	4,411	$	7,180	$	(2,394	)	$	4,786
Non-competition agreements		1,450		(614	)		836		1,450		(469	)		981

	$	8,630	$	(3,383	)	$	5,247	$	8,630	$	(2,863	)	$	5,767

Amortization expense for intangible assets was $260,000 and $520,000 for the three and six months ended June 30, 2012, and $123,000 for each of the three and six months ended June 30, 2011.

Line of Credit

6 Months Ended

Jun. 30, 2012

Line of Credit [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 June 30, 2012 and we were in compliance with all covenants under the revolving credit agreement as of that date.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Commitments and Contingencies

6 Months Ended

Jun. 30, 2012

Commitments and Contingencies [Abstract]

Commitments and Contingencies

NOTE D – Commitments and Contingencies

Operating Leases

On February 14, 2012, we executed a new lease agreement for our current headquarters location which commences on November 1, 2012 and expires on April 30, 2020. The lease includes additional square footage upon commencement, an automatic expansion of space on or about September 1, 2013, a right of first offer to lease certain additional space, and two options to extend the term of the lease for three years at a market rate determined in accordance with the lease. We will also have a rent holiday from November 2012 to October 2013 which will be incorporated into our deferred rent calculation upon commencement of the lease. In connection with this new lease, we delivered to the landlord cash or an irrevocable letter of credit for approximately $172,000, subject to increase based on square footage expansion, as security for performance of our obligations under the lease.

At June 30, 2012, our future minimum payments under operating leases were as follows (in thousands):


Remainder of 2012	$	473
2013		306
2014		2,283
2015		2,391
2016		2,500
Thereafter		9,246

	$	17,199

- Definition

The entire disclosure for commitments and contingencies.

+ References

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+ Details

Stock-Based Compensation

6 Months Ended

Jun. 30, 2012

Stock-Based Compensation [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, to employees, non-employee directors and other consultants who provide services to us. Stock options generally vest over four years and have a contractual term of seven to ten years from the date of grant. At June 30, 2012, there were approximately 1.1 million shares available for grant under approved equity compensation plans.

We recorded stock-based compensation expense of $715,000 and $1.3 million for the three and six months ended June 30, 2012, respectively. We recorded stock-based compensation expense of $487,000 and $799,000 for the three and six months ended June 30, 2011, respectively. This expense was allocated as follows (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Cost of revenues	$	116	$	72	$	214	$	118
Operating expenses
Sales and marketing		217		137		395		226
Research and development		29		16		51		23
General and administrative		353		262		667		432

Total stock-based compensation expense	$	715	$	487	$	1,327	$	799

As of June 30, 2012, there was approximately $6.8 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 2.3 years.

Stock Options

Our stock option activity was as follows:


	Options (#)			Weighted Average Exercise Price ($/share)
Outstanding at December 31, 2011		1,669,409		$	8.14
Granted		210,001			25.59
Exercised		(247,559	)		3.11
Forfeited		(16,301	)		19.33

Outstanding at June 30, 2012		1,615,550			11.07

Of the total outstanding options at June 30, 2012, 922,469 were exercisable with a weighted average exercise price of $5.85 per share. The total outstanding options had a weighted average remaining contractual life of 6.7 years.

The weighted average fair value per share of options granted during the first six months of 2012 was $10.13 and this was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:


Weighted-average volatility	46.2	%
Expected dividend yield	0	%
Expected life (in years)	4.75
Weighted-average risk-free interest rate	0.81	%

Restricted Stock Units

During the six months ended June 30, 2012, we granted 65,510 restricted stock units with a weighted average grant date fair value of $25.43 per share. These restricted stock units vest over a four year period and, upon vesting, the holder is entitled to receive shares of our common stock.

Restricted Stock Awards

During the six months ended June 30, 2012, we granted 6,330 restricted stock awards with a weighted average grant date fair value of $27.55 per share. These restricted stock units vest over a one year period and, upon vesting, the holder is entitled to receive shares of our common stock.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

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+ Details

Income Taxes

6 Months Ended

Jun. 30, 2012

Income Taxes [Abstract]

Income Taxes

NOTE F – Income Taxes

We recorded a provision for income taxes of $300,000 and $453,000 for the three and six months ended June 30, 2012, respectively. We recorded a provision for income taxes of $78,000 and $107,000 for the three and six months ended June 30, 2011, respectively. We record our interim provision for income taxes based on our estimated annual effective tax rate for the year. Our provisions for income taxes included current federal alternative minimum tax expense and current foreign and state income tax expense. In addition, our provision for income taxes for the three and six months ended June 30, 2012 included deferred tax expense.

For periods prior to the fourth quarter of 2011, a full valuation allowance was recorded against all of our deferred tax assets as it was more-likely-than-not that we would not realize these deferred tax assets, largely due to our history of taxable losses since inception. Based on our assessment during the fourth quarter of 2011, we determined that it was more-likely-than-not that we would be able to realize approximately $12.8 million of our deferred tax assets, which enabled us to release a substantial portion of the valuation allowance previously recorded. This determination was based on weighing both the positive and negative evidence available including, but not limited to, our earnings history, our projected future taxable income, our business strategy and the nature of each of our deferred tax assets.

We are subject to income taxes in the U.S. federal and various state and international jurisdictions. As of June 30, 2012, we are generally subject to tax examinations for all prior years due to our net operating loss carryforwards.

As of June 30, 2012, 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.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

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-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Net Income (Loss) per Share

6 Months Ended

Jun. 30, 2012

Net Income (Loss) per Share [Abstract]

Net Income (Loss) per Share

NOTE G – Net Income (Loss) per Share

Basic net income (loss) per share has been computed using the weighted average number of shares of common stock outstanding during each period. Diluted net income (loss) 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 (loss) per share.

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


	Three Months Ended June 30,					Six Months Ended June 30,
	2012		2011			2012		2011

Numerator
Net income (loss)	$	426	$	(109	)	$	682	$	383


Denominator
Weighted average common shares outstanding, basic		12,284		11,919			12,224		11,892
Options to purchase common stock		728		—			858		767
Restricted stock units and awards		14		—			24		—

Weighted average common shares outstanding, diluted		13,026		11,919			13,106		12,659


Net income (loss) per share
Basic	$	0.03	$	(0.01	)	$	0.06	$	0.03

Diluted	$	0.03	$	(0.01	)	$	0.05	$	0.03

For the three and six months ended June 30, 2012, the effect of approximately 22,000 outstanding potential common shares was excluded from the calculation of diluted net income per share. For the three and six months ended June 30, 2011, the effect of approximately 420,000 outstanding potential common shares was excluded from the calculation of diluted net income (loss) per share because they were anti-dilutive.

General (Policies)	6 Months Ended
General (Policies)	Jun. 30, 2012
General and Financial Statement Components [Abstract]
Business Description	Business Description We are a leading provider of on-demand supply chain management solutions and the Retail Universe community, providing integration, collaboration, connectivity, visibility and data analytics to thousands of customers worldwide. We provide our solutions through SPSCommerce.net, a hosted 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 footnotes 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, 2011 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, 2011 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on March 9, 2012.
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 six months ended June 30, 2012, 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, 2011, as filed with the Securities and Exchange Commission on March 9, 2012, 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.

Financial Statement Components (Tables)

6 Months Ended

Jun. 30, 2012

General and Financial Statement Components [Abstract]

Components of intangible assets


	June 30, 2012							December 31, 2011
	Carrying Amount		Accumulated Amortization			Net		Carrying Amount		Accumulated Amortization			Net

Subscriber relationships	$	7,180	$	(2,769	)	$	4,411	$	7,180	$	(2,394	)	$	4,786
Non-competition agreements		1,450		(614	)		836		1,450		(469	)		981

	$	8,630	$	(3,383	)	$	5,247	$	8,630	$	(2,863	)	$	5,767

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2012

Commitments and Contingencies [Abstract]

Future minimum payments under operating leases


Remainder of 2012	$	473
2013		306
2014		2,283
2015		2,391
2016		2,500
Thereafter		9,246

	$	17,199

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2012

Stock-Based Compensation [Abstract]

Stock-based compensation expense


	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Cost of revenues	$	116	$	72	$	214	$	118
Operating expenses
Sales and marketing		217		137		395		226
Research and development		29		16		51		23
General and administrative		353		262		667		432

Total stock-based compensation expense	$	715	$	487	$	1,327	$	799

Stock option activity


	Options (#)			Weighted Average Exercise Price ($/share)
Outstanding at December 31, 2011		1,669,409		$	8.14
Granted		210,001			25.59
Exercised		(247,559	)		3.11
Forfeited		(16,301	)		19.33

Outstanding at June 30, 2012		1,615,550			11.07

Weighted average fair value per share of options granted


Weighted-average volatility	46.2	%
Expected dividend yield	0	%
Expected life (in years)	4.75
Weighted-average risk-free interest rate	0.81	%

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References + Details

Net Income (Loss) per Share (Tables)

6 Months Ended

Jun. 30, 2012

Net Income (Loss) per Share [Abstract]

Components of the computation of basic and diluted net income (loss) per share


	Three Months Ended June 30,					Six Months Ended June 30,
	2012		2011			2012		2011

Numerator
Net income (loss)	$	426	$	(109	)	$	682	$	383


Denominator
Weighted average common shares outstanding, basic		12,284		11,919			12,224		11,892
Options to purchase common stock		728		—			858		767
Restricted stock units and awards		14		—			24		—

Weighted average common shares outstanding, diluted		13,026		11,919			13,106		12,659


Net income (loss) per share
Basic	$	0.03	$	(0.01	)	$	0.06	$	0.03

Diluted	$	0.03	$	(0.01	)	$	0.05	$	0.03

Financial Statement Components (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Components of intangible assets
Carrying Amount	$ 8,630	$ 8,630
Accumulated Amortization	(3,383)	(2,863)
Net	5,247	5,767
Subscriber relationships [Member]
Components of intangible assets
Carrying Amount	7,180	7,180
Accumulated Amortization	(2,769)	(2,394)
Net	4,411	4,786
Non-competition agreements [Member]
Components of intangible assets
Carrying Amount	1,450	1,450
Accumulated Amortization	(614)	(469)
Net	$ 836	$ 981

Financial Statement Components (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Financial Statement Components (Textual) [Abstract]
Amortization of intangible assets	$ 260	$ 123	$ 520	$ 123

Line of Credit (Details)	6 Months Ended
Line of Credit (Details)	Jun. 30, 2012 USD ($)
Line of Credit (Textual) [Abstract]
Revolving credit facility, amount	$ 20,000,000
Revolving credit facility, maturity date	Sep. 30, 2016
Borrowings outstanding	$ 0

Commitments and Contingencies (Details) $ in Thousands	Jun. 30, 2012 USD ($)
Future minimum payments under operating leases
Remainder of 2012	$ 473
2013	306
2014	2,283
2015	2,391
2016	2,500
Thereafter	9,246
Operating leases, total	$ 17,199

Commitments and Contingencies (Details Textual)	6 Months Ended
Commitments and Contingencies (Details Textual)	Jun. 30, 2012 USD ($)
Commitments and Contingencies (Textual) [Abstract]
Lease agreement expire, date	Apr. 30, 2020
Number of options to extend term of the lease	2
Options to extend the term of the lease, number of years	3 years
Landlord cash or an irrevocable letter of credit	$ 172,000

Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Stock-Based Compensation (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock-based compensation expense
Total stock-based compensation expense	$ 715	$ 487	$ 1,327	$ 799
Cost of revenues [Member]
Stock-based compensation expense
Total stock-based compensation expense	116	72	214	118
Sales and marketing [Member]
Stock-based compensation expense
Total stock-based compensation expense	217	137	395	226
Research and development [Member]
Stock-based compensation expense
Total stock-based compensation expense	29	16	51	23
General and administrative [Member]
Stock-based compensation expense
Total stock-based compensation expense	$ 353	$ 262	$ 667	$ 432

Stock-Based Compensation (Details 1)	6 Months Ended
Stock-Based Compensation (Details 1)	Jun. 30, 2012 $ / shares shares
Stock option activity
Options, Outstanding at December 31, 2011 \| shares	1,669,409
Options, Granted \| shares	210,001
Options, Exercised \| shares	(247,559)
Options, Forfeited \| shares	(16,301)
Options, Outstanding at June 30, 2012 \| shares	1,615,550
Weighted Average Exercise Price, Outstanding at December 31, 2011 \| $ / shares	$ 8.14
Weighted Average Exercise Price, Granted \| $ / shares	25.59
Weighted Average Exercise Price, Exercised \| $ / shares	3.11
Weighted Average Exercise Price, Forfeited \| $ / shares	19.33
Weighted Average Exercise Price, Outstanding at June 30, 2012 \| $ / shares	$ 11.07

Stock-Based Compensation (Details 2)	6 Months Ended
Stock-Based Compensation (Details 2)	Jun. 30, 2012
Weighted average fair value per share of options granted
Weighted-average volatility	46.20%
Expected dividend yield	0.00%
Expected life (in years)	4 years 9 months
Weighted-average risk-free interest rate	0.81%

Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock-Based Compensation (Textual) [Abstract]
Stock options vest, period			4 years
Stock options contractual term, from the date of grant			seven to ten years
Shares available for grant	1,100,000		1,100,000
Stock-based compensation	$ 715	$ 487	$ 1,327	$ 799
Unrecognized stock-based compensation	$ 6,800		$ 6,800
Unrecognized stock-based compensation, expected to be recognized, weighted average period			2 years 3 months 18 days
Total outstanding options	922,469		922,469
Weighted average exercise price	$ 5.85		$ 5.85
Weighted average remaining contractual life			6 years 8 months 12 days
Weighted average fair value per share of options granted			$ 10.13
Granted restricted stock units			65,510
Restricted stock units with a weighted average grant date fair value			$ 25.43
Restricted stock units vest over, period			4 years
Restricted stock awards			6,330
Restricted stock awards with a weighted average grant date fair value per share			$ 27.55
Restricted stock awards units vest over, period			1 year

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Income Taxes (Textual) [Abstract]
Provision for income taxes	$ 300	$ 78	$ 453	$ 107
Deferred tax assets, valuation allowance					$ 12,800

Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator
Net income (loss)	$ 426	$ (109)	$ 682	$ 383
Denominator
Weighted average common shares outstanding, basic	12,284	11,919	12,224	11,892
Options to purchase common stock	728		858	767
Restricted stock units and awards	14		24
Weighted average common shares outstanding, diluted	13,026	11,919	13,106	12,659
Net income (loss) per share
Basic	$ 0.03	$ (0.01)	$ 0.06	$ 0.03
Diluted	$ 0.03	$ (0.01)	$ 0.05	$ 0.03

Net Income (Loss) per Share (Details Textual) - shares	3 Months Ended		6 Months Ended
Net Income (Loss) per Share (Details Textual) - shares	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net Income (Loss) per Share (Textual) [Abstract]
Outstanding potential common shares, anti-dilutive	22,000	420,000	22,000	420,000

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details