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Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2013	Feb. 05, 2014	Jun. 30, 2013
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Trading Symbol	SPSC
Entity Registrant Name	SPS COMMERCE INC
Entity Central Index Key	0001092699
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		16,136,234
Entity Public Float			$ 827.4

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 131,294	$ 66,050
Accounts receivable, less allowance for doubtful accounts of $237 and $227, respectively	11,611	10,940
Deferred costs, current	9,048	7,346
Deferred income taxes, current	1,272	1,732
Prepaid expenses and other current assets	2,850	5,443
Total current assets	156,075	91,511
PROPERTY AND EQUIPMENT, net	9,922	7,670
GOODWILL	25,487	25,487
INTANGIBLE ASSETS, net	17,082	20,240
OTHER ASSETS
Deferred costs, net of current portion	3,684	3,202
Deferred income taxes, net of current portion	10,870	10,853
Other non-current assets	210	238
Total assets	223,330	159,201
CURRENT LIABILITIES
Accounts payable	1,798	1,857
Accrued compensation and benefits	7,981	6,038
Accrued expenses and other current liabilities	2,801	1,077
Deferred revenue, current	6,335	5,499
Total current liabilities	18,915	14,471
OTHER LIABILITIES
Deferred revenue, less current portion	8,785	8,312
Deferred rent	2,857	1,601
Total liabilities	30,557	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; 16,092,121 and 14,812,759 shares issued and outstanding, respectively	16	15
Additional paid-in capital	239,549	182,645
Accumulated deficit	(46,792)	(47,843)
Total stockholders' equity	192,773	134,817
Total liabilities and stockholder's equity	$ 223,330	$ 159,201

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 237	$ 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	16,092,121	14,812,759
Common stock, shares outstanding	16,092,121	14,812,759

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Revenues	$ 104,391	$ 77,106	$ 57,969
Cost of revenues	31,781	22,040	15,366
Gross profit	72,610	55,066	42,603
Operating expenses
Sales and marketing	39,621	30,037	23,836
Research and development	10,870	8,166	5,838
General and administrative	17,189	13,524	11,151
Amortization of intangible assets	3,158	1,767	643
Total operating expenses	70,838	53,494	41,468
Income from operations	1,772	1,572	1,135
Other income (expense)
Interest expense		(27)
Interest income	112	46	89
Other expense	(147)	(248)	(140)
Total other expense, net	(35)	(229)	(51)
Income before income taxes	1,737	1,343	1,084
Income tax (expense) benefit	(686)	(121)	12,619
Net income	$ 1,051	$ 1,222	$ 13,703
Net income per share
Basic	$ 0.07	$ 0.09	$ 1.15
Diluted	$ 0.07	$ 0.09	$ 1.08
Weighted average common shares used to compute net income per share
Basic	15,201	13,056	11,960
Diluted	15,931	13,910	12,744

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2010	$ 43,508	$ 12	$ 106,264	$ (62,768)
Beginning Balance, Shares at Dec. 31, 2010		11,849,572
Stock-based compensation	1,768		1,768
Exercise of stock options	$ 621		621
Exercise of stock options, Shares	289,286	289,286
Stock offering costs	$ (108)		(108)
Excess tax benefit of stock options exercised	61		61
Net income	13,703			13,703
Ending Balance at Dec. 31, 2011	59,553	$ 12	108,606	(49,065)
Ending Balance, Shares at Dec. 31, 2011		12,138,858
Stock-based compensation	2,755		2,755
Exercise of stock options	$ 1,564	$ 1	1,563
Exercise of stock options, Shares	468,717	468,717
Excess tax benefit of stock options exercised	$ 72		72
Employee stock purchase plan	448		448
Employee stock purchase plan, Shares		17,332
Stock issued for acquisition	11,395		11,395
Stock issued for acquisition, Shares		347,852
Stock offering, net of costs	57,808	$ 2	57,806
Stock offering, net of costs, Shares		1,840,000
Net income	1,222			1,222
Ending Balance at Dec. 31, 2012	134,817	$ 15	182,645	(47,843)
Ending Balance, Shares at Dec. 31, 2012		14,812,759
Stock-based compensation	4,203		4,203
Exercise of stock options and issuance of restricted stock	$ 3,735		3,735
Exercise of stock options, Shares	469,225
Exercise of stock options and issuance of restricted stock, Shares		497,248
Excess tax benefit of stock options exercised	$ 156		156
Employee stock purchase plan	1,242		1,242
Employee stock purchase plan, Shares		32,114
Stock offering, net of costs	47,569	$ 1	47,568
Stock offering, net of costs, Shares		750,000
Net income	1,051			1,051
Ending Balance at Dec. 31, 2013	$ 192,773	$ 16	$ 239,549	$ (46,792)
Ending Balance, Shares at Dec. 31, 2013		16,092,121

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities
Net income	$ 1,051	$ 1,222	$ 13,703
Reconciliation of net income to net cash provided by operating activities
Deferred income taxes	443	(15)	(12,708)
Depreciation and amortization of property and equipment	4,893	3,151	2,004
Amortization of intangible assets	3,158	1,767	643
Provision for doubtful accounts	479	383	425
Stock-based compensation	4,203	2,755	1,768
Changes in assets and liabilities, net of effect of acquisitions
Accounts receivable	(1,150)	(2,067)	(2,810)
Deferred costs	(2,184)	(2,290)	(1,595)
Prepaid expenses and other current assets	2,593	(3,534)	(882)
Other assets	28	(42)	(10)
Accounts payable	(59)	446	413
Accrued compensation and benefits	1,943	920	1,541
Accrued expenses and other current liabilities	(108)	101	140
Deferred rent	1,644	1,481
Deferred revenue	1,309	2,551	1,853
Net cash provided by operating activities	18,243	6,829	4,485
Cash flows from investing activities
Business acquisitions, net of cash acquired		(26,262)	(10,841)
Purchases of property and equipment	(5,701)	(5,983)	(2,584)
Net cash used in investing activities	(5,701)	(32,245)	(13,425)
Cash flows from financing activities
Payments of capital lease obligations		(410)	(122)
Borrowings on line of credit		11,000
Payments on line of credit		(11,000)
Net proceeds from stock offerings	47,738	57,940
Stock offering costs	(169)	(132)	(108)
Net proceeds from exercise of options to purchase common stock	3,735	1,563	621
Excess tax benefit from exercise of options to purchase common stock	156	72	61
Net proceeds from employee stock purchase plan	1,242	448
Net cash provided by financing activities	52,702	59,481	452
Net increase (decrease) in cash and cash equivalents	65,244	34,065	(8,488)
Cash and cash equivalents at beginning of period	66,050	31,985	40,473
Cash and cash equivalents at end of period	131,294	66,050	31,985
Supplemental disclosure of cash flow information
Cash paid for interest		27	3
Cash paid for income taxes	$ 55	47	$ 126
Noncash financing activities:
Common stock issued for business acquisition		$ 11,396

General	12 Months Ended
General	Dec. 31, 2013
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 consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of SPS Commerce, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in the consolidated financial statements. *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. *Business Combinations* We recognize separately from goodwill the fair value of the assets acquired and the liabilities assumed at the acquisition date. Goodwill as of the acquisition date is measured as the excess of consideration transferred and the net of the acquisition date amounts of the assets acquired and the liabilities assumed. Assets acquired include tangible and intangible assets. We determine the value and useful lives of purchased intangible assets with the assistance of an independent third-party valuation firm using certain estimates and assumptions. While we use estimates and assumptions that we believe are reasonable as a part of the purchase price allocation process to accurately value the assets acquired and the liabilities assumed at the acquisition date, they are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, we may record adjustments to the fair value of the assets acquired and the liabilities assumed. Any such adjustments would be recorded as an offset to goodwill. Upon the conclusion of the measurement period or final determination of the fair values, whichever comes first, any subsequent adjustments would be recorded in our consolidated statements of income. *Segment Information* We operate in and report on one segment, supply chain management solutions. *Risk and Uncertainties* We rely on hardware and software licensed from third parties to offer our on-demand solutions. Our management believes alternate sources are available; however, disruption or termination of these relationships could adversely affect our operating results in the near term. *Fair Value of Financial Instruments* The carrying amounts of our financial instruments, which include cash and cash equivalents, accounts receivable, accounts payable and other accrued expenses, approximates fair value due to their short maturities. *Concentration of Credit Risk* Financial instruments that potentially subject us to concentrations of credit risk consist principally of temporary cash and cash equivalents in financial institutions in excess of federally insured limits and trade accounts receivable. Temporary cash investments are held with financial institutions that we believe are subject to minimal risk. *Cash and Cash Equivalents* Cash and cash equivalents consist of cash and highly liquid investments with original maturities when purchased of less than 90 days. *Accounts Receivable* Accounts receivable are initially recorded upon the sale of solutions to customers. Credit is granted in the normal course of business without collateral. Accounts receivable are stated net of allowances for doubtful accounts, which represent estimated losses resulting from the inability of customers to make the required payments. Accounts that are outstanding longer than the contractual terms are considered past due. When determining the allowances for doubtful accounts, we take several factors into consideration including the overall composition of the accounts receivable aging, our prior history of accounts receivable write-offs, the type of customers and our day-to-day knowledge of specific customers. We write off accounts receivable when they become uncollectible. Changes in the allowances for doubtful accounts are recorded as bad debt expense and are included in general and administrative expense in our consolidated statements of income. *Property and Equipment* Property and equipment, including assets acquired under capital lease obligations, are stated at cost, net of accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the shorter of the estimated useful lives of the individual assets or the lease term. The estimated useful lives are: Computer equipment and purchased software: 2 to 5 years Office equipment and furniture: 5 to 7 years Leasehold improvements: 2 to 7 years Significant additions or improvements extending asset lives beyond one year are capitalized, while repairs and maintenance are charged to expense as incurred. The assets and related accumulated depreciation and amortization accounts are adjusted for asset retirements and disposals with the resulting gain or loss included in net income. *Research and Development* Research and development costs primarily include maintenance and data conversion activities related to our cloud-based supply chain management solutions and are expensed as incurred. *Goodwill* Goodwill represents the excess of the purchase price over the fair value of identifiable net assets acquired in business combinations. We test goodwill for impairment annually at December 31, or more frequently if events or changes in circumstances indicate that the asset might be impaired. The impairment test is conducted by comparing the fair value of the net assets with the carrying value of the reporting unit. Fair value is determined using the direct market observation of market price and outstanding equity of the reporting unit at December 31. If the carrying value of the goodwill exceeds the fair value of the reporting unit, goodwill may be impaired. If this occurs, the fair value is then allocated to its assets and liabilities in a manner similar to a purchase price allocation in order to determine the implied fair value of goodwill. This implied fair value is then compared to the carrying amount of goodwill and, if it is less, we would recognize an impairment loss. *Intangible Assets* Assets acquired in business combinations may include identifiable intangible assets such as subscriber relationships and non-competition agreements. We recognize separately from goodwill the fair value of the identifiable intangible assets acquired. We have determined the fair value and useful lives of our purchased intangible assets with the assistance of a third-party valuation firm using certain estimates and assumptions. The purchased intangible assets are being amortized on a straight-line basis over their estimated useful lives, which is three to nine years for subscriber relationships and two to five years for non-competition agreements. *Impairment of Long-Lived Assets* We review our long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. The carrying amount of a long-lived asset is not recoverable if the carrying amount of an asset group exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the assets at the date it is tested for recoverability, whether in use or under development. An impairment loss is measured as the amount by which the carrying amount of a long-lived asset exceeds its fair value. *Revenue Recognition* We generate revenues by providing a number of solutions to our customers. These solutions include Trading Partner Integration, Trading Partner Enablement and Trading Partner Intelligence. All of our solutions are hosted applications that allow customers to meet their supply chain management requirements. Sales taxes are presented on a net basis within revenue. Revenues are recorded when all of the following criteria are met: (1) persuasive evidence of an arrangement exists, (2) delivery has occurred, (3) the fee is fixed or determinable, and (4) collectability is probable. If collection is not considered probable, revenues are recognized when the fees are collected. Fees related to our Trading Partner Integration, Trading Partner Enablement and Trading Partner Intelligence solutions consist of two revenue sources: set-up fees and recurring monthly fees. Set-up fees are specific for each connection a customer has with a trading partner and most of our customers have connections with numerous trading partners. Set-up fees are nonrefundable upfront fees that do not have standalone value to our customer and are not separable from the recurring monthly fees. All set-up fees and related costs are deferred and recognized ratably over the average life of the connection between the customer and the trading partner, which is approximately two years. We begin recognizing set-up fee revenue once the connection is established. Set-up fees for which connections have not yet been established are classified as long-term. We continue to evaluate the length of the amortization period as more experience is gained with contract cancellations and technology changes requested by our customers. It is possible that, in the future, the period over which such subscription set-up fees and costs are amortized may be adjusted. Any change in our estimate of the average connection life will affect our future results of operations. The recurring monthly fees are comprised of both fixed and transaction-based fees that are recognized as earned. *Stock-Based Compensation* We recognize the cost of all share-based payments to employees, including grants of employee stock options, in the financial statements based on the grant date fair value of those awards. This cost is recognized over the period for which an employee is required to provide service in exchange for the award. Benefits associated with tax deductions in excess of recognized compensation expense are reported as a cash flow from financing activities. We estimate the fair value of options granted using the Black-Scholes option pricing model. The estimation of stock awards that will ultimately vest requires judgment, and to the extent actual results differ from our estimates, such amounts will be recorded as an adjustment in the period estimates are revised. In valuing share-based awards, judgment is required in determining the expected volatility of common stock and the expected term individuals will hold their share-based awards prior to exercising. Expected volatility of the stock is based on a peer group in the industry in which we do business because we do not have sufficient historical volatility data for our own common stock. The expected term of the options is based on the simplified method which does not consider historical or expected employee exercise behavior. *Advertising Costs* Advertising costs are charged to expense as incurred. Advertising costs were approximately $61,000, $150,000 and $93,000 for the years ended December 31, 2013, 2012 and 2011, respectively. Advertising costs are included in sales and marketing expenses in our consolidated statements of income. *Income Taxes* We account for income taxes using the liability method, which requires recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance when it is not “more likely than not” that the deferred tax asset will be utilized. We assess our ability to realize our deferred tax assets on a regular and periodic basis. Realization of our deferred tax assets is contingent upon future taxable earnings. Accordingly, this assessment requires significant estimates and judgment. If the estimates of future taxable income vary from actual results, our assessment regarding the realization of these deferred tax assets could change. Future changes in the estimated amount of deferred taxes expected to be realized will be reflected in our consolidated financial statements in the period the estimate is changed, with a corresponding adjustment to our operating results. We recognize the financial statement benefit of a tax position only after determining that the relevant tax authority would “more likely than not” sustain the position following an audit. For tax positions meeting the “more likely than not” threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant tax authority. *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, restricted stock units and awards. Potential common shares that are anti-dilutive are excluded from the calculation of diluted net income per share. *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.

+ References

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+ Details

Business Acquisitions

12 Months Ended

Dec. 31, 2013

Business Combinations [Abstract]

Business Acquisitions

NOTE B – Business Acquisitions

Edifice

On August 6, 2012, we entered into an asset purchase agreement with Edifice Information Management Systems, Inc. (“Edifice”), a privately-held information services company specializing in the collection, analysis and distribution of point-of-sale data used by retailers and suppliers to improve their supply chain efficiencies. We completed the asset purchase on August 7, 2012. Under the asset purchase agreement, we purchased and acquired substantially all of the assets of Edifice for $26.3 million in cash and 347,852 shares of our common stock. We also assumed certain liabilities of Edifice. This acquisition increased our point-of-sale analytic offerings, expanded our base of recurring revenue customers and added suppliers to our network.

Purchase Price Allocation

We accounted for the acquisition as a business combination. We allocated the purchase price to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date. We engaged a third-party valuation firm to assist us in the determination of the value of the purchased intangible assets. The excess of the purchase price over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill. Goodwill is attributed to a trained workforce and other buyer-specific value resulting from expected synergies, including long-term cost savings, which are not included in the fair values of assets. Goodwill will not be amortized; however it is deductible for tax purposes.

During the fourth quarter of 2012, we completed our evaluation of the purchase price allocation and there were no adjustments to the purchase price or net assets acquired.

The purchase price consisted of the following (in thousands):


Cash	$	26,275
SPS Commerce, Inc. common stock		11,396

	$	37,671

We borrowed $11.0 million under our existing line of credit to fund a portion of the cash paid for the acquisition. The number of shares of our common stock issued for the acquisition was 347,852 shares as calculated according to the terms of the purchase agreement. The fair value of the shares issued was determined using the closing price of our common stock on August 6, 2012.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date (in thousands):


Current assets	$	1,457
Property and equipment		1,456
Goodwill		19,634
Intangible assets		16,240
Other assets		116
Current liabilities		(1,232	)

	$	37,671

Purchased Intangible Assets

The following table summarizes the estimated fair value of the purchased intangible assets and their estimated useful lives:


Purchased Intangible Assets	Estimated Fair Value (in thousands)		Estimated Life (in years)
Subscriber relationships	$	15,980		9
Non-competition agreements		260		5

Total	$	16,240

The purchased intangible assets are being amortized on a straight-line basis over their estimated useful lives. Amortization expense related to these intangible assets was $1.8 million for the year ended December 31, 2013 and $727,000 for the period from August 7, 2012 through December 31, 2012.

Acquisition-Related Costs and Post-Acquisition Operating Results

Acquisition-related costs were $212,000 and are included in our consolidated statements of income for the year ended December 31, 2012. The operating results of Edifice have been included in our consolidated financial statements from August 7, 2012, the closing date of the acquisition. For the period from August 7, 2012 through December 31, 2012, approximately $5.0 million of our revenues were derived from Edifice customers. The amount of operating income or loss from Edifice was not separately identifiable due to our integration.

Unaudited Pro Forma Financial Information

The unaudited pro forma financial information in the table below presents the combined operating results of SPS Commerce and Edifice as if the acquisition had occurred on January 1, 2011. The unaudited pro forma information includes the historical operating results of each company and pro forma adjustments for the approximate $1.8 million of annual amortization expense related to purchased intangible assets and the additional impact on the provision or benefit for income taxes, resulting from the combined income and intangible amortization expense, using our statutory blended income tax rate of 36.5%.


	Year Ended December 31,
(in thousands, except per share data)	2012		2011
Pro forma total revenue	$	83,478	$	68,543
Pro forma net income		1,055		12,757
Pro forma net income per share
Basic		0.08		1.04
Diluted		0.07		0.97

The unaudited pro forma financial information is presented for informational purposes only and is not necessarily indicative of the results of operations that would have actually been reported had the acquisition occurred on January 1, 2011, nor is it necessarily indicative of our results of operations for any future periods.

Direct EDI

On May 17, 2011, we entered into an asset purchase agreement with Direct EDI LLC, a privately-held provider of cloud-based integration solutions for electronic data interchange, and we completed the asset purchase on May 18, 2011. Under the asset purchase agreement, we purchased and acquired substantially all of the assets of Direct EDI for $10.8 million in cash and assumed certain liabilities of Direct EDI. The acquisition of Direct EDI expanded our base of recurring revenue customers.

Purchase Price Allocation

We accounted for the acquisition as a business combination. We allocated the purchase price to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date. We engaged a third-party valuation firm to assist us in the determination of the value of the purchased intangible assets. The excess of the purchase price over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill. Goodwill is attributed to a trained workforce and other buyer-specific value resulting from expected synergies, including long-term cost savings that are not included in the fair values of assets. Goodwill will not be amortized; however it is deductible for tax purposes. During the fourth quarter of 2011, we completed our evaluation of the purchase price allocation and recorded a purchase price adjustment of approximately $25,000 related to working capital.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date (in thousands):


Current assets	$	195
Property and equipment		42
Intangible assets		6,120
Goodwill		4,688
Current liabilities		(204	)

Total purchase price	$	10,841

Purchased Intangible Assets

The following table summarizes the estimated fair value of the purchased intangible assets and their estimated useful lives:


Purchased Intangible Assets	Estimated Fair Value (in thousands)		Estimated Life (in years)
Subscriber relationships	$	5,250		7
Non-competition agreements		870		3

Total	$	6,120

The purchased intangible assets are being amortized on a straight-line basis over their estimated useful lives. Amortization expense related to these intangible assets was $1.0 million for each of the years ended December 31, 2013 and 2012 and $643,000 for the year ended December 31, 2011.

Acquisition-Related Costs and Post-Acquisition Operating Results

Acquisition-related costs were approximately $232,000 and are included in general and administrative expense in our consolidated statements of income for the year ended December 31, 2011. The operating results of Direct EDI have been included in our consolidated financial statements from May 18, 2011, the closing date of the acquisition. For the year ended December 31, 2011, approximately $2.7 million of our revenues were derived from Direct EDI customers. The amount of operating income or loss from Direct EDI was not separately identifiable due to our integration.

Unaudited Pro Forma Financial Information

The unaudited pro forma financial information in the table below presents the combined operating results of SPS Commerce and Direct EDI as if the acquisition had occurred on January 1, 2011. The unaudited pro forma information includes the historical operating results of each company and certain pro forma adjustments, including annual amortization expense for purchased intangible assets of approximately $1.0 million and additional annual compensation expense of approximately $280,000 related to employment arrangements entered into as part of the acquisition.


(in thousands, except per share data)	Year Ended December 31, 2011
Pro forma total revenue	$	59,815
Pro forma net income		13,576
Pro forma net income per share
Basic		1.14
Diluted		1.07

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ Details

Accounts Receivable, net

12 Months Ended

Dec. 31, 2013

Receivables [Abstract]

Accounts Receivable, net

NOTE C – Accounts Receivable, net

The allowance for doubtful accounts activity, included in accounts receivable, net, was as follows (in thousands):


	2013			2012			2011
Balances, January 1	$	227		$	222		$	209
Provision for doubtful accounts		479			383			425
Write-offs		(504	)		(426	)		(436	)
Recoveries		35			48			24

Balances, December 31	$	237		$	227		$	222

Property and Equipment, net

12 Months Ended

Dec. 31, 2013

Property Plant And Equipment [Abstract]

Property and Equipment, net

NOTE D – Property and Equipment, net

Property and equipment, net included the following (in thousands):


	December 31,
	2013			2012

Computer equipment and purchased software	$	18,368		$	13,154
Office equipment and furniture		3,828			2,975
Leasehold improvements		2,682			1,784

		24,878			17,913
Less: accumulated depreciation and amortization		(14,956	)		(10,243	)

	$	9,922		$	7,670

At December 31, 2013 and 2012, property and equipment, net included approximately $71,000 and $59,000, respectively, of assets held at subsidiary and office locations outside of the United States of America.

Goodwill and Intangible Assets, net

12 Months Ended

Dec. 31, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, net

NOTE E – Goodwill and Intangible Assets, net

There was no change in our goodwill for the year ended December 31, 2013.

Intangible assets, net included the following (in thousands):


	December 31,
	2013							2012
	Carrying Amount		Accumulated Amortization			Net		Carrying Amount		Accumulated Amortization			Net
Subscriber relationships	$	23,160	$	(6,376	)	$	16,784	$	23,160	$	(3,850	)	$	19,310
Non-competition agreements		1,710		(1,412	)		298		1,710		(780	)		930

	$	24,870	$	(7,788	)	$	17,082	$	24,870	$	(4,630	)	$	20,240

Amortization expense for intangible assets was $3.2 million, $1.8 million and $643,000 for the years ended December 31, 2013, 2012 and 2011, respectively.

Amortization expense for the year ended December 31, 2013 included $290,000 for the impairment of a certain non-competition agreement.

At December 31, 2013, future amortization expense for intangible assets was as follows (in thousands):


2014	$	2,688
2015		2,578
2016		2,577
2017		2,557
2018		2,062
Thereafter		4,620

	$	17,082

- 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	12 Months Ended
Line of Credit	Dec. 31, 2013
Debt Disclosure [Abstract]
Line of Credit	NOTE F – 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. Interest on amounts borrowed under the credit facility is based on (i) an Adjusted LIBO Rate (as defined in the revolving credit agreement) plus an applicable margin of 175 to 225 basis points based on our net working capital, or (ii) JPMorgan’s prime rate (provided it is not less than the Adjusted One Month LIBO Rate (as defined in the revolving credit agreement)) plus an applicable margin of -25 to 25 basis points based on our net working capital. Interest is payable monthly in arrears. Availability under the credit facility is subject to a borrowing base equal to the sum of 250% of our eligible monthly recurring revenue (as defined in the revolving credit agreement) and all borrowings are due in full no later than the maturity date of the agreement. The revolving credit agreement contains customary representations, warranties, covenants and events of default, including, but not limited to financial covenants requiring us to maintain a fixed charge coverage ratio of not less than 1.20 to 1.00, cash and cash equivalents of not less than $10 million and a minimum number of recurring revenue customers. If an event of default occurs, among other things, the applicable interest rate is subject to an increase of 2% and all outstanding obligations may become immediately due and payable. There were no borrowings under the revolving credit agreement in 2013. In connection with the acquisition of Edifice in 2012 (see Note B), we borrowed $11.0 million under our line of credit to fund a portion of the cash paid for the acquisition. On September 11, 2012, this debt was repaid in full with a portion of the proceeds received from our public offering of common stock on that date (see Note I). As of December 31, 2013, there were no borrowings outstanding, approximately $20.0 million was available for borrowings, and we were in compliance with all covenants under the revolving credit agreement.

Accrued Expenses and Other Current Liabilities	12 Months Ended
Accrued Expenses and Other Current Liabilities	Dec. 31, 2013
Payables And Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	NOTE G – Accrued Expenses and Other Current Liabilities In the second quarter of 2013, we entered into an agreement to purchase software licenses. At December 31, 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.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2013

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE H – Commitments and Contingencies

Capital Leases

In connection with the acquisition of Edifice (see Note B), we assumed certain capital lease obligations for computer equipment and purchased software. As of September 30, 2012, these leases were fully repaid.

We previously leased certain computer equipment and purchased software under capital leases with an interest rate of 10.75%. These capital lease obligations were fully repaid in 2011.

Operating Leases

We are obligated under non-cancellable operating leases primarily for office space. Rent expense charged to operations was $2.8 million, $1.6 million and $963,000 for the years ended December 31, 2013, 2012 and 2011, respectively.

On February 14, 2012, we executed a new lease agreement for our current headquarters location which commenced 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. In the fourth quarter of 2013, we exercised our right to assume additional space. We have not yet occupied this additional space; however, the future non-cancellable payments are included in the table below. There was also a rent holiday from November 2012 to October 2013 which has been incorporated into our deferred rent calculation. 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 December 31, 2013, our future minimum payments under operating leases were as follows (in thousands):


2014	$	1,965
2015		2,055
2016		1,648
2017		1,677
2018		1,748
Thereafter		2,444

	$	11,537

Other Contingencies

We may be involved in various claims and legal actions in the normal course of business. Our management believes that the outcome of any such claims and legal actions will not have a significant adverse effect on our financial position, results of operations or cash flows.

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2013
Equity [Abstract]
Stockholders' Equity	NOTE I – Stockholders’ Equity Common Stock Issued On November 25, 2013, we completed a public stock offering where we issued and sold 750,000 shares of our common stock at a price to the public of $67.00 per share. We received net proceeds of approximately $47.6 million from this offering after payment of approximately $2.7 million of underwriting discounts and commissions and legal, accounting and other fees incurred in connection with the offering. On September 11, 2012, we completed a public stock offering where we issued and sold 1,840,000 shares of our common stock, including 240,000 shares sold pursuant to the exercise in full of the underwriters’ over-allotment option, at a price to the public of $33.50 per share. We received net proceeds of approximately $57.8 million from this offering after payment of approximately $3.8 million of underwriting discounts and commissions and legal, accounting and other fees incurred in connection with the offering. On August 7, 2012, in connection with the acquisition of Edifice (see Note B), we issued 347,852 shares of our common stock. The fair value of the shares issued was determined using the closing price of our common stock on August 6, 2012.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Stock-Based Compensation

12 Months Ended

Dec. 31, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

NOTE J – 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 2013, 888,765 additional shares were reserved for future issuance under our 2010 Equity Incentive Plan. At December 31, 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 $4.2 million, $2.8 million and $1.8 million for the years ended December 31, 2013, 2012 and 2011, respectively. This expense was allocated as follows (in thousands):


	Year Ended December 31,
	2013		2012		2011
Cost of revenues	$	475	$	382	$	255
Operating expenses
Sales and marketing		1,481		895		471
Research and development		266		140		56
General and administrative		1,981		1,338		986

Total stock-based compensation expense	$	4,203	$	2,755	$	1,768

As of December 31, 2013, there was approximately $7.2 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 2.6 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 January 1, 2011		1,549,344		$	4.59
Granted		431,790			17.04
Exercised		(289,286	)		2.15
Forfeited		(22,439	)		11.38

Outstanding at December 31, 2011		1,669,409			8.14
Granted		240,831			26.38
Exercised		(468,717	)		3.35
Forfeited		(71,382	)		19.25

Outstanding at December 31, 2012		1,370,141			12.41
Granted		225,439			40.64
Exercised		(469,225	)		7.96
Forfeited		(29,132	)		30.93

Outstanding at December 31, 2013		1,097,223			19.62

Of the total outstanding options at December 31, 2013, 642,928 were exercisable with a weighted average exercise price of $12.98 per share. The total outstanding options had a weighted average remaining contractual life of 5.8 years.

The fair value of options that vested during the years ended December 31, 2013, 2012 and 2011 was $2.6 million, $2.3 million and $1.3 million, respectively.

The intrinsic value of options exercised during the years ended December 31, 2013, 2012 and 2011 was $20.7 million, $12.1 million and $4.9 million, respectively. The intrinsic value of outstanding options at December 31, 2013, 2012 and 2011 was $50.1 million, $34.1 million and $29.7 million, respectively.

The weighted-average fair values per share of options granted during 2013, 2012 and 2011 were $14.60, $10.43 and $8.25, respectively. The fair values of the options granted was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:


	Year Ended December 31,
	2013	2012	2011
Weighted-average volatility	41%	46%	45%
Expected dividend yield	—	—	—
Expected life (in years)	4.75	4.75	6.25
Risk-free interest rate	0.68% - 1.37%	0.61% - 0.82%	1.58% - 3.05%

Prior to becoming a public entity in 2010, historic volatility was not available for our shares. As a result, we have estimated volatility based on a peer group of companies, which collectively provided a reasonable basis for estimating volatility. We intend to continue to consistently use the same group of publicly traded peer companies to determine volatility in the future until sufficient information regarding volatility of our share price becomes available or the selected companies are no longer suitable for this purpose.

We have not issued dividends on our common stock and do not expect to do so in the foreseeable future. The expected term of the options is based on the simplified method which does not consider historical or expected employee exercise behavior. The estimated pre-vesting forfeiture rate is based on our historical experience. The risk-free interest rate is based on the U.S. Treasury rates at the date of grant with maturity dates approximately equal to the expected life at the grant date.

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 January 1, 2012		—		$	—
Granted		75,873			26.25
Vested and common stock issued		—			—
Forfeited		(7,632	)		25.32

Outstanding at December 31, 2012		68,241			26.35
Granted		59,695			40.06
Vested and common stock issued		(17,060	)		26.09
Forfeited		(8,232	)		33.85

Outstanding at December 31, 2013		102,644			33.77

The number of restricted stock units outstanding at December 31, 2013 included 11,001 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 Awards (#)			Weighted Average Grant Date Fair Value ($/share)
Outstanding at January 1, 2012		—		$	—
Restricted common stock issued		6,330			27.55
Restrictions lapsed		—			—
Forfeited		(1,055	)		27.55

Outstanding at December 31, 2012		5,275			27.55
Restricted common stock issued		5,688			48.66
Restrictions lapsed		(9,541	)		36.99
Forfeited		—			—

Outstanding at December 31, 2013		1,422			48.66

Employee Stock Purchase Plan

Effective July 1, 2012, we adopted an employee stock purchase plan which 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 periods in 2013, we withheld approximately $1.2 million from employees participating in the plan and we purchased 32,114 shares on their behalf. For the offering period in 2012, we withheld approximately $448,000 from employees participating in the plan and we purchased 17,332 shares on their behalf.

For the years ended December 31, 2013 and 2012, we recorded approximately $402,000 and $148,000 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:


	Year Ended December 31,
	2013	2012
Expected volatility	46%	46%
Expected dividend yield	—	—
Expected life (in years)	0.50	0.50
Risk-free interest rate	0.09% - 0.12%	0.15%

Income Taxes

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Income Taxes

NOTE K – Income Taxes

The provision (benefit) for income taxes was as follows (in thousands):


	Year Ended December 31,
	2013			2012			2011
Current
Federal	$	—		$	—		$	—
State		192			74			89
Foreign		51			63			—
Deferred
Federal		450			188			(12,282	)
State		(7	)		(204	)		(426	)

	$	686		$	121		$	(12,619	)

A reconciliation of the provision (benefit) for income taxes to the statutory federal rate was as follows (in thousands):


	Year Ended December 31,
	2013			2012			2011
Expected federal income tax at statutory rate	$	593		$	459		$	396
State income taxes, net of federal tax effect		78			31			37
Tax impact of foreign activity		44			(8	)		55
Permanent book/tax differences		106			23			100
Change in valuation allowance		17			(88	)		(1,310	)
Release of valuation allowance		—			—			(12,802	)
Section 382 limitation		—			—			415
Change in state deferred rate		53			(162	)		—
Prior year true up		4			(135	)		43
General business credit		(202	)		—			—
State net operating loss adjustment		—			—			413
Other		(7	)		1			34

Total provision (benefit) for income taxes	$	686		$	121		$	(12,619	)

The significant components of our deferred tax assets (liabilities) were as follows (in thousands):


	December 31,
	2013			2012
Current
Current net operating loss and credit carryforwards	$	1,258		$	1,615
Accounts receivable allowance		157			143
Stock-based compensation expense		229			154
Accrued expenses		790			643

Total current deferred tax asset		2,434			2,555

Foreign operations		(53	)		—
Deferred operations		(985	)		(784	)

Total current deferred tax liability		(1,038	)		(784	)

Valuation allowance		(124	)		(39	)

Net current deferred tax asset	$	1,272		$	1,732

Non-current
Net operating loss and credit carryforwards	$	6,145		$	6,474
Deferred operations		3,029			2,533
Stock-based compensation expense		1,561			1,332
Depreciation and amortization		1,159			738
Other		34			18

Total non-current deferred tax asset		11,928			11,095
Valuation allowance		(1,058	)		(242	)

Net non-current deferred tax asset	$	10,870		$	10,853

As of December 31, 2013, we had net operating loss carryforwards of $71.3 million for U.S. federal tax purposes. We also had $30.3 million of various state net operating loss carryforwards. The loss carryforwards for federal tax purposes will expire between 2019 and 2034 if not utilized. The loss carryforwards for state tax purposes will expire between 2014 and 2034 if not utilized.

Section 382 of the U.S. Internal Revenue Code generally imposes an annual limitation on the amount of net operating loss carryforwards that might be used to offset taxable income when a corporation has undergone significant changes in stock ownership. We have performed a Section 382 analysis for the time period from our inception through December 8, 2010. During this time period it was determined that we had six separate ownership changes under Section 382. We have not updated the Section 382 analysis subsequent to December 8, 2010; however, we believe there have not been any events subsequent to that date that would materially impact the analysis. We believe that approximately $17.6 million of federal losses will expire unused due to Section 382 limitations. The maximum annual limitation of federal net operating losses under Section 382 is approximately $990,000. This limitation could be further restricted if any ownership changes occur in future years.

Our federal and state net operating losses at December 31, 2013 included $37.0 million and $10.2 million, respectively, of income tax deductions in excess of previously recorded tax benefits. Although these additional tax deductions are included in the net operating losses referenced above, the related tax benefit will not be recognized until the deductions reduce our income taxes payable. The tax benefit of these excess deductions will be reflected as a credit to additional paid in capital when recognized. Accordingly, our deferred tax assets are reported net of the excess tax deductions for stock compensation and Section 382 limitations.

As of December 31, 2013 we had federal research and development credit carryforwards, net of Section 383 limitations, of $322,000, which, if not utilized, will begin to expire in 2030. We had state research and development credit carryforwards of $82,000, which, if not utilized, will begin to expire in 2025.

As of December 31, 2013, we had a valuation allowance against our deferred tax assets of $1.2 million. The valuation allowance is established for various state net operating loss and credit carryforwards that we do not expect to utilize based on our current expectations of future state taxable income.

As of December 31, 2013 and 2012, we had income tax receivables of $26,000 and $72,000, respectively, which were included in prepaid expenses and other current assets on the consolidated balance sheets.

We are subject to income taxes in the U.S. federal and various state and international jurisdictions. We are generally subject to U.S. federal and state tax examinations for all prior tax years due to our net operating loss carryforwards and the utilization of the carryforwards in years still open under statute. As of December 31, 2013, we are not under any income tax audits by tax authorities.

As of December 31, 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

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Net Income Per Share

NOTE L – 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):


	Year Ended December 31,
	2013		2012		2011
Numerator
Net income	$	1,051	$	1,222	$	13,703

Denominator
Weighted average common shares outstanding, basic		15,201		13,056		11,960
Options to purchase common stock		676		826		784
Restricted stock units		51		26		—
Employee stock purchase plan		3		2		—

Weighted average common shares outstanding, diluted		15,931		13,910		12,744

Net income per share
Basic	$	0.07	$	0.09	$	1.15

Diluted	$	0.07	$	0.09	$	1.08

For the year ended December 31, 2013, the effect of approximately 1,000 outstanding potential common shares was excluded from the calculation of diluted net income per share because they were anti-dilutive. For the years ended December 31, 2012 and 2011, the effect of all outstanding potential common shares was included in the calculation of diluted net income per share.

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plan	NOTE M – Employee Benefit Plan We sponsor a 401(k) retirement savings plan for our employees. Employees can contribute up to 100% of their salaries. The company will match 25% of the employee’s contribution up to the first 6% of salary. Our matching contributions to the plan, which vest immediately, were $522,000, $372,000 and $287,000 for the years ended December 31, 2013, 2012 and 2011, respectively.

Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (Unaudited)

NOTE N – Selected Quarterly Financial Data (Unaudited)

The following table presents our selected unaudited quarterly statements of income data (in thousands, except per share amounts):


	For the Three Months Ended
2013	Mar 31		Jun 30		Sep 30		Dec 31
Revenues	$	23,752	$	25,658	$	27,008	$	27,973
Gross profit		16,686		17,715		18,759		19,450
Income from operations		194		483		371		724
Net income		199		288		270		294
Diluted earnings per share		0.01		0.02		0.02		0.02


	For the Three Months Ended
2012	Mar 31		Jun 30		Sep 30		Dec 31
Revenues	$	16,534	$	17,821	$	20,267	$	22,484
Gross profit		12,086		12,978		14,322		15,680
Income from operations		459		751		138		224
Net income		256		426		174		366
Diluted earnings per share		0.02		0.03		0.01		0.02

General (Policies)	12 Months Ended
General (Policies)	Dec. 31, 2013
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 consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of SPS Commerce, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in the consolidated financial statements.
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.
Business Combinations	*Business Combinations* We recognize separately from goodwill the fair value of the assets acquired and the liabilities assumed at the acquisition date. Goodwill as of the acquisition date is measured as the excess of consideration transferred and the net of the acquisition date amounts of the assets acquired and the liabilities assumed. Assets acquired include tangible and intangible assets. We determine the value and useful lives of purchased intangible assets with the assistance of an independent third-party valuation firm using certain estimates and assumptions. While we use estimates and assumptions that we believe are reasonable as a part of the purchase price allocation process to accurately value the assets acquired and the liabilities assumed at the acquisition date, they are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, we may record adjustments to the fair value of the assets acquired and the liabilities assumed. Any such adjustments would be recorded as an offset to goodwill. Upon the conclusion of the measurement period or final determination of the fair values, whichever comes first, any subsequent adjustments would be recorded in our consolidated statements of income.
Segment Information	Segment Information We operate in and report on one segment, supply chain management solutions.
Risk and Uncertainties	Risk and Uncertainties We rely on hardware and software licensed from third parties to offer our on-demand solutions. Our management believes alternate sources are available; however, disruption or termination of these relationships could adversely affect our operating results in the near term.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The carrying amounts of our financial instruments, which include cash and cash equivalents, accounts receivable, accounts payable and other accrued expenses, approximates fair value due to their short maturities.
Concentration of Credit Risk	*Concentration of Credit Risk* Financial instruments that potentially subject us to concentrations of credit risk consist principally of temporary cash and cash equivalents in financial institutions in excess of federally insured limits and trade accounts receivable. Temporary cash investments are held with financial institutions that we believe are subject to minimal risk.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents consist of cash and highly liquid investments with original maturities when purchased of less than 90 days.
Accounts Receivable	Accounts Receivable Accounts receivable are initially recorded upon the sale of solutions to customers. Credit is granted in the normal course of business without collateral. Accounts receivable are stated net of allowances for doubtful accounts, which represent estimated losses resulting from the inability of customers to make the required payments. Accounts that are outstanding longer than the contractual terms are considered past due. When determining the allowances for doubtful accounts, we take several factors into consideration including the overall composition of the accounts receivable aging, our prior history of accounts receivable write-offs, the type of customers and our day-to-day knowledge of specific customers. We write off accounts receivable when they become uncollectible. Changes in the allowances for doubtful accounts are recorded as bad debt expense and are included in general and administrative expense in our consolidated statements of income.
Property and Equipment	Property and Equipment Property and equipment, including assets acquired under capital lease obligations, are stated at cost, net of accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the shorter of the estimated useful lives of the individual assets or the lease term. The estimated useful lives are: Computer equipment and purchased software: 2 to 5 years Office equipment and furniture: 5 to 7 years Leasehold improvements: 2 to 7 years Significant additions or improvements extending asset lives beyond one year are capitalized, while repairs and maintenance are charged to expense as incurred. The assets and related accumulated depreciation and amortization accounts are adjusted for asset retirements and disposals with the resulting gain or loss included in net income.
Research and Development	*Research and Development* Research and development costs primarily include maintenance and data conversion activities related to our cloud-based supply chain management solutions and are expensed as incurred.
Goodwill	Goodwill Goodwill represents the excess of the purchase price over the fair value of identifiable net assets acquired in business combinations. We test goodwill for impairment annually at December 31, or more frequently if events or changes in circumstances indicate that the asset might be impaired. The impairment test is conducted by comparing the fair value of the net assets with the carrying value of the reporting unit. Fair value is determined using the direct market observation of market price and outstanding equity of the reporting unit at December 31. If the carrying value of the goodwill exceeds the fair value of the reporting unit, goodwill may be impaired. If this occurs, the fair value is then allocated to its assets and liabilities in a manner similar to a purchase price allocation in order to determine the implied fair value of goodwill. This implied fair value is then compared to the carrying amount of goodwill and, if it is less, we would recognize an impairment loss.
Intangible Assets	Intangible Assets Assets acquired in business combinations may include identifiable intangible assets such as subscriber relationships and non-competition agreements. We recognize separately from goodwill the fair value of the identifiable intangible assets acquired. We have determined the fair value and useful lives of our purchased intangible assets with the assistance of a third-party valuation firm using certain estimates and assumptions. The purchased intangible assets are being amortized on a straight-line basis over their estimated useful lives, which is three to nine years for subscriber relationships and two to five years for non-competition agreements.
Impairment of Long-Lived Assets	*Impairment of Long-Lived Assets* We review our long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. The carrying amount of a long-lived asset is not recoverable if the carrying amount of an asset group exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the assets at the date it is tested for recoverability, whether in use or under development. An impairment loss is measured as the amount by which the carrying amount of a long-lived asset exceeds its fair value.
Revenue Recognition	*Revenue Recognition* We generate revenues by providing a number of solutions to our customers. These solutions include Trading Partner Integration, Trading Partner Enablement and Trading Partner Intelligence. All of our solutions are hosted applications that allow customers to meet their supply chain management requirements. Sales taxes are presented on a net basis within revenue. Revenues are recorded when all of the following criteria are met: (1) persuasive evidence of an arrangement exists, (2) delivery has occurred, (3) the fee is fixed or determinable, and (4) collectability is probable. If collection is not considered probable, revenues are recognized when the fees are collected. Fees related to our Trading Partner Integration, Trading Partner Enablement and Trading Partner Intelligence solutions consist of two revenue sources: set-up fees and recurring monthly fees. Set-up fees are specific for each connection a customer has with a trading partner and most of our customers have connections with numerous trading partners. Set-up fees are nonrefundable upfront fees that do not have standalone value to our customer and are not separable from the recurring monthly fees. All set-up fees and related costs are deferred and recognized ratably over the average life of the connection between the customer and the trading partner, which is approximately two years. We begin recognizing set-up fee revenue once the connection is established. Set-up fees for which connections have not yet been established are classified as long-term. We continue to evaluate the length of the amortization period as more experience is gained with contract cancellations and technology changes requested by our customers. It is possible that, in the future, the period over which such subscription set-up fees and costs are amortized may be adjusted. Any change in our estimate of the average connection life will affect our future results of operations. The recurring monthly fees are comprised of both fixed and transaction-based fees that are recognized as earned.
Stock-Based Compensation	Stock-Based Compensation We recognize the cost of all share-based payments to employees, including grants of employee stock options, in the financial statements based on the grant date fair value of those awards. This cost is recognized over the period for which an employee is required to provide service in exchange for the award. Benefits associated with tax deductions in excess of recognized compensation expense are reported as a cash flow from financing activities. We estimate the fair value of options granted using the Black-Scholes option pricing model. The estimation of stock awards that will ultimately vest requires judgment, and to the extent actual results differ from our estimates, such amounts will be recorded as an adjustment in the period estimates are revised. In valuing share-based awards, judgment is required in determining the expected volatility of common stock and the expected term individuals will hold their share-based awards prior to exercising. Expected volatility of the stock is based on a peer group in the industry in which we do business because we do not have sufficient historical volatility data for our own common stock. The expected term of the options is based on the simplified method which does not consider historical or expected employee exercise behavior.
Advertising Costs	Advertising Costs Advertising costs are charged to expense as incurred. Advertising costs were approximately $61,000, $150,000 and $93,000 for the years ended December 31, 2013, 2012 and 2011, respectively. Advertising costs are included in sales and marketing expenses in our consolidated statements of income.
Income Taxes	*Income Taxes* We account for income taxes using the liability method, which requires recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance when it is not “more likely than not” that the deferred tax asset will be utilized. We assess our ability to realize our deferred tax assets on a regular and periodic basis. Realization of our deferred tax assets is contingent upon future taxable earnings. Accordingly, this assessment requires significant estimates and judgment. If the estimates of future taxable income vary from actual results, our assessment regarding the realization of these deferred tax assets could change. Future changes in the estimated amount of deferred taxes expected to be realized will be reflected in our consolidated financial statements in the period the estimate is changed, with a corresponding adjustment to our operating results. We recognize the financial statement benefit of a tax position only after determining that the relevant tax authority would “more likely than not” sustain the position following an audit. For tax positions meeting the “more likely than not” threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant tax authority.
Net Income Per Share	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, restricted stock units and awards. Potential common shares that are anti-dilutive are excluded from the calculation of diluted net income per share.
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.

Business Acquisitions (Tables)

12 Months Ended

Dec. 31, 2013

Business Purchase Price

The purchase price consisted of the following (in thousands):


Cash	$	26,275
SPS Commerce, Inc. common stock		11,396

	$	37,671

Edifice [Member]

Estimated Fair Values of Assets Acquired and Liabilities Assumed at Acquisition Date

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date (in thousands):


Current assets	$	1,457
Property and equipment		1,456
Goodwill		19,634
Intangible assets		16,240
Other assets		116
Current liabilities		(1,232	)

	$	37,671

Estimated Fair Value of Purchased Intangible Assets and Estimated Useful Lives

The following table summarizes the estimated fair value of the purchased intangible assets and their estimated useful lives:


Purchased Intangible Assets	Estimated Fair Value (in thousands)		Estimated Life (in years)

Subscriber relationships	$	15,980		9
Non-competition agreements		260		5

Total	$	16,240

Unaudited Pro Forma Financial Information


	Year Ended December 31,
(in thousands, except per share data)	2012		2011

Pro forma total revenue	$	83,478	$	68,543
Pro forma net income		1,055		12,757
Pro forma net income per share
Basic		0.08		1.04
Diluted		0.07		0.97

Direct EDI [Member]

Estimated Fair Values of Assets Acquired and Liabilities Assumed at Acquisition Date

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date (in thousands):


Current assets	$	195
Property and equipment		42
Intangible assets		6,120
Goodwill		4,688
Current liabilities		(204	)

Total purchase price	$	10,841

Estimated Fair Value of Purchased Intangible Assets and Estimated Useful Lives

The following table summarizes the estimated fair value of the purchased intangible assets and their estimated useful lives:


Purchased Intangible Assets	Estimated Fair Value (in thousands)		Estimated Life (in years)

Subscriber relationships	$	5,250		7
Non-competition agreements		870		3

Total	$	6,120

Unaudited Pro Forma Financial Information


(in thousands, except per share data)	Year Ended December 31, 2011

Pro forma total revenue	$	59,815
Pro forma net income		13,576
Pro forma net income per share
Basic		1.14
Diluted		1.07

Accounts Receivable, net (Tables)

12 Months Ended

Dec. 31, 2013

Receivables [Abstract]

Schedule of Allowance for Doubtful Activity Including in Accounts Receivable Net

The allowance for doubtful accounts activity, included in accounts receivable, net, was as follows (in thousands):


	2013			2012			2011
Balances, January 1	$	227		$	222		$	209
Provision for doubtful accounts		479			383			425
Write-offs		(504	)		(426	)		(436	)
Recoveries		35			48			24

Balances, December 31	$	237		$	227		$	222

Property and Equipment, net (Tables)

12 Months Ended

Dec. 31, 2013

Property Plant And Equipment [Abstract]

Schedule of Property and equipment, net

Property and equipment, net included the following (in thousands):


	December 31,
	2013			2012

Computer equipment and purchased software	$	18,368		$	13,154
Office equipment and furniture		3,828			2,975
Leasehold improvements		2,682			1,784

		24,878			17,913
Less: accumulated depreciation and amortization		(14,956	)		(10,243	)

	$	9,922		$	7,670

Goodwill and Intangible Assets, net (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible assets, net included the following (in thousands):


	December 31,
	2013							2012
	Carrying Amount		Accumulated Amortization			Net		Carrying Amount		Accumulated Amortization			Net
Subscriber relationships	$	23,160	$	(6,376	)	$	16,784	$	23,160	$	(3,850	)	$	19,310
Non-competition agreements		1,710		(1,412	)		298		1,710		(780	)		930

	$	24,870	$	(7,788	)	$	17,082	$	24,870	$	(4,630	)	$	20,240

Future Amortization Expense for Intangible Assets

At December 31, 2013, future amortization expense for intangible assets was as follows (in thousands):


2014	$	2,688
2015		2,578
2016		2,577
2017		2,557
2018		2,062
Thereafter		4,620

	$	17,082

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Commitments And Contingencies Disclosure [Abstract]

Future Minimum Payments Under Operating Leases

At December 31, 2013, our future minimum payments under operating leases were as follows (in thousands):


2014	$	1,965
2015		2,055
2016		1,648
2017		1,677
2018		1,748
Thereafter		2,444

	$	11,537

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Stock-Based Compensation Expense

This expense was allocated as follows (in thousands):


	Year Ended December 31,
	2013		2012		2011
Cost of revenues	$	475	$	382	$	255
Operating expenses
Sales and marketing		1,481		895		471
Research and development		266		140		56
General and administrative		1,981		1,338		986

Total stock-based compensation expense	$	4,203	$	2,755	$	1,768

Stock Option Activity

Our stock option activity was as follows:


	Options (#)			Weighted Average Exercise Price ($/share)
Outstanding at January 1, 2011		1,549,344		$	4.59
Granted		431,790			17.04
Exercised		(289,286	)		2.15
Forfeited		(22,439	)		11.38

Outstanding at December 31, 2011		1,669,409			8.14
Granted		240,831			26.38
Exercised		(468,717	)		3.35
Forfeited		(71,382	)		19.25

Outstanding at December 31, 2012		1,370,141			12.41
Granted		225,439			40.64
Exercised		(469,225	)		7.96
Forfeited		(29,132	)		30.93

Outstanding at December 31, 2013		1,097,223			19.62

Weighted Average Fair Value Per Share of Options Granted, Assumptions

The fair values of the options granted was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:


	Year Ended December 31,
	2013	2012	2011
Weighted-average volatility	41%	46%	45%
Expected dividend yield	—	—	—
Expected life (in years)	4.75	4.75	6.25
Risk-free interest rate	0.68% - 1.37%	0.61% - 0.82%	1.58% - 3.05%

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:


	Year Ended December 31,
	2013	2012
Expected volatility	46%	46%
Expected dividend yield	—	—
Expected life (in years)	0.50	0.50
Risk-free interest rate	0.09% - 0.12%	0.15%

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 January 1, 2012		—		$	—
Granted		75,873			26.25
Vested and common stock issued		—			—
Forfeited		(7,632	)		25.32

Outstanding at December 31, 2012		68,241			26.35
Granted		59,695			40.06
Vested and common stock issued		(17,060	)		26.09
Forfeited		(8,232	)		33.85

Outstanding at December 31, 2013		102,644			33.77

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 January 1, 2012		—		$	—
Restricted common stock issued		6,330			27.55
Restrictions lapsed		—			—
Forfeited		(1,055	)		27.55

Outstanding at December 31, 2012		5,275			27.55
Restricted common stock issued		5,688			48.66
Restrictions lapsed		(9,541	)		36.99
Forfeited		—			—

Outstanding at December 31, 2013		1,422			48.66

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of Provision (Benefit) for Income Taxes

The provision (benefit) for income taxes was as follows (in thousands):


	Year Ended December 31,
	2013			2012			2011
Current
Federal	$	—		$	—		$	—
State		192			74			89
Foreign		51			63			—
Deferred
Federal		450			188			(12,282	)
State		(7	)		(204	)		(426	)

	$	686		$	121		$	(12,619	)

Reconciliation of the Provision (Benefit) for Income Taxes to the Statutory Federal Rate

A reconciliation of the provision (benefit) for income taxes to the statutory federal rate was as follows (in thousands):


	Year Ended December 31,
	2013			2012			2011
Expected federal income tax at statutory rate	$	593		$	459		$	396
State income taxes, net of federal tax effect		78			31			37
Tax impact of foreign activity		44			(8	)		55
Permanent book/tax differences		106			23			100
Change in valuation allowance		17			(88	)		(1,310	)
Release of valuation allowance		—			—			(12,802	)
Section 382 limitation		—			—			415
Change in state deferred rate		53			(162	)		—
Prior year true up		4			(135	)		43
General business credit		(202	)		—			—
State net operating loss adjustment		—			—			413
Other		(7	)		1			34

Total provision (benefit) for income taxes	$	686		$	121		$	(12,619	)

Significant Components of Deferred Tax Assets (Liabilities)

The significant components of our deferred tax assets (liabilities) were as follows (in thousands):


	December 31,
	2013			2012
Current
Current net operating loss and credit carryforwards	$	1,258		$	1,615
Accounts receivable allowance		157			143
Stock-based compensation expense		229			154
Accrued expenses		790			643

Total current deferred tax asset		2,434			2,555

Foreign operations		(53	)		—
Deferred operations		(985	)		(784	)

Total current deferred tax liability		(1,038	)		(784	)

Valuation allowance		(124	)		(39	)

Net current deferred tax asset	$	1,272		$	1,732

Non-current
Net operating loss and credit carryforwards	$	6,145		$	6,474
Deferred operations		3,029			2,533
Stock-based compensation expense		1,561			1,332
Depreciation and amortization		1,159			738
Other		34			18

Total non-current deferred tax asset		11,928			11,095
Valuation allowance		(1,058	)		(242	)

Net non-current deferred tax asset	$	10,870		$	10,853

Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 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):


	Year Ended December 31,
	2013		2012		2011
Numerator
Net income	$	1,051	$	1,222	$	13,703

Denominator
Weighted average common shares outstanding, basic		15,201		13,056		11,960
Options to purchase common stock		676		826		784
Restricted stock units		51		26		—
Employee stock purchase plan		3		2		—

Weighted average common shares outstanding, diluted		15,931		13,910		12,744

Net income per share
Basic	$	0.07	$	0.09	$	1.15

Diluted	$	0.07	$	0.09	$	1.08

Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Summary of Unaudited Quarterly Statements of Income Data

The following table presents our selected unaudited quarterly statements of income data (in thousands, except per share amounts):


	For the Three Months Ended
2013	Mar 31		Jun 30		Sep 30		Dec 31
Revenues	$	23,752	$	25,658	$	27,008	$	27,973
Gross profit		16,686		17,715		18,759		19,450
Income from operations		194		483		371		724
Net income		199		288		270		294
Diluted earnings per share		0.01		0.02		0.02		0.02


	For the Three Months Ended
2012	Mar 31		Jun 30		Sep 30		Dec 31
Revenues	$	16,534	$	17,821	$	20,267	$	22,484
Gross profit		12,086		12,978		14,322		15,680
Income from operations		459		751		138		224
Net income		256		426		174		366
Diluted earnings per share		0.02		0.03		0.01		0.02

General - Additional Information (Detail)	12 Months Ended
General - Additional Information (Detail)	Dec. 31, 2013 USD ($) Segment	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)
Schedule Of Accounting Policies [Line Items]
Number of reportable segments \| Segment	1
Expected life of customer relationship period	2 years
Advertising costs \| $	$ 61,000	$ 150,000	$ 93,000
Computer equipment and purchased software [Member] \| Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of property and equipment	5 years
Computer equipment and purchased software [Member] \| Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of property and equipment	2 years
Office equipment and furniture [Member] \| Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of property and equipment	7 years
Office equipment and furniture [Member] \| Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of property and equipment	5 years
Leasehold improvements [Member] \| Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of property and equipment	7 years
Leasehold improvements [Member] \| Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of property and equipment	2 years
Subscriber relationships [Member] \| Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of intangible assets	9 years
Subscriber relationships [Member] \| Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of intangible assets	3 years
Non-competition agreements [Member] \| Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of intangible assets	5 years
Non-competition agreements [Member] \| Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of intangible assets	2 years

Business Acquisitions - Additional Information (Detail) - USD ($)			1 Months Ended		3 Months Ended	5 Months Ended	12 Months Ended
	Aug. 06, 2012	May 17, 2011	Aug. 07, 2012	Aug. 06, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Number of Shares of common stock issued for acquisition			347,852
Amortization expense							$ 3,158,000	$ 1,767,000	$ 643,000
Purchase price adjustment related to working capital					$ 25,000
Additional annual compensation expense related to arrangements							280,000
Edifice [Member]
Business Acquisition [Line Items]
Assets acquired in cash	$ 26,300,000						26,275,000
Number of Shares of common stock issued for acquisition				347,852
Amount borrowed from existing line of credit for payment of business acquisition								11,000,000
Amortization expense						$ 727,000	1,800,000	1,800,000
Acquisition-related cost included in consolidated statements								$ 212,000
Revenues derived from customers						$ 5,000,000
Statutory blended income tax rate								36.50%
Direct EDI [Member]
Business Acquisition [Line Items]
Assets acquired in cash		$ 10,800,000
Amortization expense							$ 1,000,000	$ 1,000,000	643,000
Acquisition-related cost included in consolidated statements									232,000
Revenues derived from customers									$ 2,700,000

Business Acquisitions - Business Purchase Price (Detail) - Edifice [Member] - USD ($) $ in Thousands		12 Months Ended
	Aug. 06, 2012	Dec. 31, 2013
Business Acquisition [Line Items]
Cash	$ 26,300	$ 26,275
SPS Commerce, Inc. common stock		11,396
Total purchase price		$ 37,671

Business Acquisitions - Estimated Fair Values of the Assets Acquired and Liabilities Assumed at the Acquisition Date (Detail) - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]
GOODWILL	$ 25,487	$ 25,487
Edifice [Member]
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]
Current assets	1,457
Property and equipment	1,456
GOODWILL	19,634
Intangible assets	16,240
Other assets	116
Current liabilities	(1,232)
Total purchase price	37,671
Direct EDI [Member]
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]
Current assets	195
Property and equipment	42
GOODWILL	4,688
Intangible assets	6,120
Current liabilities	(204)
Total purchase price	$ 10,841

Business Acquisitions - Estimated Fair Value of Purchased Intangible Assets and Estimated Useful Lives (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2013 USD ($)
Edifice [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 16,240
Edifice [Member] \| Subscriber relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (in years)	9 years
Estimated Fair Value	$ 15,980
Edifice [Member] \| Non-competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (in years)	5 years
Estimated Fair Value	$ 260
Direct EDI [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 6,120
Direct EDI [Member] \| Subscriber relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (in years)	7 years
Estimated Fair Value	$ 5,250
Direct EDI [Member] \| Non-competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (in years)	3 years
Estimated Fair Value	$ 870

Business Acquisitions - Unaudited Pro Forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Edifice [Member]
Business Acquisition [Line Items]
Pro forma total revenue	$ 83,478	$ 68,543
Pro forma net income	$ 1,055	$ 12,757
Pro forma net income per share, Basic	$ 0.08	$ 1.04
Pro forma net income per share, Diluted	$ 0.07	$ 0.97
Direct EDI [Member]
Business Acquisition [Line Items]
Pro forma total revenue		$ 59,815
Pro forma net income		$ 13,576
Pro forma net income per share, Basic		$ 1.14
Pro forma net income per share, Diluted		$ 1.07

Accounts Receivable, Net - Schedule of Allowance for Doubtful Activity Included in Accounts Receivable Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Receivables [Abstract]
Beginning Balance	$ 227	$ 222	$ 209
Provision for doubtful accounts	479	383	425
Write-offs	(504)	(426)	(436)
Recoveries	35	48	24
Ending Balance	$ 237	$ 227	$ 222

Property and Equipment, Net - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 24,878	$ 17,913
Less: accumulated depreciation and amortization	(14,956)	(10,243)
Net, Total	9,922	7,670
Computer equipment and purchased software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	18,368	13,154
Office equipment and furniture [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,828	2,975
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 2,682	$ 1,784

Property and Equipment, Net - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property Plant And Equipment Useful Life And Values [Abstract]
Property and equipment, net	$ 71,000	$ 59,000

Goodwill and Intangible Assets, Net - Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	$ 24,870	$ 24,870
Accumulated Amortization	(7,788)	(4,630)
Net	17,082	20,240
Subscriber relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	23,160	23,160
Accumulated Amortization	(6,376)	(3,850)
Net	16,784	19,310
Non-competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	1,710	1,710
Accumulated Amortization	(1,412)	(780)
Net	$ 298	$ 930

Goodwill and Intangible Assets, Net - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 3,158,000	$ 1,767,000	$ 643,000
Impairment of non-competition agreements	$ 290,000

Goodwill and Intangible Assets, Net - Future Amortization Expense for Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
2014	$ 2,688
2015	2,578
2016	2,577
2017	2,557
2018	2,062
Thereafter	4,620
Net	$ 17,082	$ 20,240

Line of Credit - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Line of Credit Facility [Line Items]
Revolving credit facility, amount	$ 20,000
Revolving credit facility, maturity date	Sep. 30, 2016
Cash and cash equivalents	$ 131,294	$ 66,050	$ 31,985	$ 40,473
Borrowings outstanding revolving credit agreement	$ 0
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Interest rate description	Interest on amounts borrowed under the credit facility is based on (i) an Adjusted LIBO Rate (as defined in the revolving credit agreement) plus an applicable margin of 175 to 225 basis points based on our net working capital, or (ii) JPMorgan's prime rate (provided it is not less than the Adjusted One Month LIBO Rate (as defined in the revolving credit agreement)) plus an applicable margin of -25 to 25 basis points based on our net working capital.
Borrowing base in compliance with eligible monthly recurring revenue	250.00%
Cash and cash equivalents	$ 10,000
Applicable interest rate	2.00%
Amount borrowed from line of credit to fund cash paid for business acquisition	$ 11,000
Borrowings outstanding revolving credit agreement	0
Borrowings available revolving credit agreement	$ 20,000
Minimum [Member]
Line of Credit Facility [Line Items]
Fixed Charge Coverage Ratio	1.20
Minimum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Fixed Charge Coverage Ratio	1.20
Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Applicable margin based on net working capital	1.75%
Minimum [Member] \| Prime Rate [Member]
Line of Credit Facility [Line Items]
Applicable margin based on net working capital	(0.25%)
Maximum [Member]
Line of Credit Facility [Line Items]
Fixed Charge Coverage Ratio	1.00
Maximum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Fixed Charge Coverage Ratio	1.00
Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Applicable margin based on net working capital	2.25%
Maximum [Member] \| Prime Rate [Member]
Line of Credit Facility [Line Items]
Applicable margin based on net working capital	0.25%

Accrued Expenses and Other Current Liabilities - Additional Information (Detail) $ in Millions	Dec. 31, 2013 USD ($)
Software And Licenses [Member]
Accrued Expenses And Other Current Liabilities [Line Items]
Future payments for next fiscal year	$ 1.4

Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013 USD ($) OptionPlan	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Previously leased capital leases, interest rate	10.75%
Rent expense charged to operations	$ 2,800,000	$ 1,600,000	$ 963,000
Lease agreement expires, date	Apr. 30, 2020
Number of options to extend term of the lease \| OptionPlan	2
Options to extend the term of the lease, number of years	3 years
Landlord cash or an irrevocable letter of credit	$ 172,000

Commitments and Contingencies - Future Minimum Payments Under Operating Leases (Detail) $ in Thousands	Dec. 31, 2013 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2014	$ 1,965
2015	2,055
2016	1,648
2017	1,677
2018	1,748
Thereafter	2,444
Operating leases, total	$ 11,537

Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Nov. 25, 2013	Sep. 11, 2012	Aug. 07, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Common stock issued and sold	750,000	1,840,000		16,092,121	14,812,759
Issue price of shares	$ 67.00	$ 33.50
Net proceeds from issue of shares	$ 47,600	$ 57,800		$ 47,738	$ 57,940
Underwriting discounts and commissions and legal, accounting and other fees	$ 2,700	$ 3,800		$ 169	$ 132	$ 108
Shares issued to underwriters under over allotment options		240,000
Common Stock, Shares, Issued			347,852

Stock-Based Compensation - Additional Information (Detail)	1 Months Ended	12 Months Ended
	Jan. 31, 2013 shares	Dec. 31, 2013 USD ($) OfferingPeriods $ / shares shares	Dec. 31, 2012 USD ($) $ / shares shares	Dec. 31, 2011 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant \| shares		1,800,000
Stock-based compensation expense		$ 4,203,000	$ 2,755,000	$ 1,768,000
Unrecognized stock-based compensation expense		$ 7,200,000
Unrecognized stock-based compensation, expected to be recognized, weighted average period		2 years 7 months 6 days
Stock options vest, period		4 years
Stock options contractual term, from the date of grant		Seven to ten years
Stock options exercisable \| shares		642,928
Weighted average exercise price \| $ / shares		$ 12.98
Weighted average remaining contractual life		5 years 9 months 18 days
Fair value of options vested		$ 2,600,000	2,300,000	1,300,000
Intrinsic value of options exercised		20,700,000	12,100,000	4,900,000
Intrinsic value of options outstanding		$ 50,100,000	$ 34,100,000	$ 29,700,000
Weighted average fair value per share of options granted \| $ / shares		$ 14.60	$ 10.43	$ 8.25
Number of RSU's vested and not issued during the period \| shares		11,001
Percentage of common stock on fair market value		85.00%
Number of offerings per year \| OfferingPeriods		2
Employee stock purchase plan, employees contribution		$ 1,200,000	$ 448,000
Employee stock purchase plan, shares purchased \| shares		32,114	17,332
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units vest over, 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
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 \| shares	888,765
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 402,000	$ 148,000
Common stock reserved for future issuance \| shares		1,200,000

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 4,203	$ 2,755	$ 1,768
Cost of revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	475	382	255
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,481	895	471
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	266	140	56
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,981	$ 1,338	$ 986

Stock-Based Compensation - Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, Beginning balance	1,370,141	1,669,409	1,549,344
Options, Granted	225,439	240,831	431,790
Options, Exercised	(469,225)	(468,717)	(289,286)
Options, Forfeited	(29,132)	(71,382)	(22,439)
Options Outstanding, Ending balance	1,097,223	1,370,141	1,669,409
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 12.41	$ 8.14	$ 4.59
Weighted Average Exercise Price, Granted	40.64	26.38	17.04
Weighted Average Exercise Price, Exercised	7.96	3.35	2.15
Weighted Average Exercise Price, Forfeited	30.93	19.25	11.38
Weighted Average Exercise Price, Outstanding, Ending Balance	$ 19.62	$ 12.41	$ 8.14

Stock-Based Compensation - Weighted Average Fair Value Per Share of Options Granted (Detail) - Stock Options [Member]	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Weighted-average volatility	41.00%	46.00%	45.00%
Expected dividend yield
Expected life (in years)	4 years 9 months	4 years 9 months	6 years 3 months
Minimum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Risk-free interest rate	0.68%	0.61%	1.58%
Maximum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Risk-free interest rate	1.37%	0.82%	3.05%

Stock-Based Compensation - Restricted Stock Units (Detail) - Restricted Stock Units [Member] - $ / shares	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding, Beginning Balance	68,241
Granted, stock units	59,695	75,873
Vested, stock units	(17,060)
Forfeited, stock units	(8,232)	(7,632)
Stock awards, Outstanding, Ending Balance	102,644	68,241
Weighted average grant date fair value, Outstanding, Beginning Balance	$ 26.35
Granted, Weighted Average Grant Date Fair Value	40.06	$ 26.25
Vested, Weighted Average Grant Date Fair Value	26.09
Forfeited, Weighted Average Grant Date Fair Value	33.85	25.32
Weighted average grant date fair value, Outstanding, Ending Balance	$ 33.77	$ 26.35

Stock-Based Compensation - Restricted Stock Awards (Detail) - Restricted Stock Award [Member] - $ / shares	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding, Beginning Balance	5,275
Restricted common stock issued, stock awards	5,688	6,330
Restrictions lapsed, stock awards	(9,541)
Forfeited, stock awards		(1,055)
Stock awards, Outstanding, Ending Balance	1,422	5,275
Weighted average grant date fair value, Outstanding, Beginning Balance	$ 27.55
Restricted common stock issued, Weighted Average Grant Date Fair Value	48.66	$ 27.55
Restrictions lapsed, Weighted Average Grant Date Fair Value	36.99
Forfeited, Weighted Average Grant Date Fair Value		27.55
Weighted average grant date fair value, Outstanding, Ending Balance	$ 48.66	$ 27.55

Stock-Based Compensation - Fair Value Estimation of Common Stock Using Black-Scholes Option Pricing Model, Assumptions (Detail) - Employee Stock Purchase Plan [Member]	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	46.00%	46.00%
Expected dividend yield
Expected life (in years)	6 months	6 months
Risk-free interest rate		0.15%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.09%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.12%

Income Taxes - Schedule of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current
Federal
State	192	74	89
Foreign	51	63
Deferred
Federal	450	188	(12,282)
State	(7)	(204)	(426)
Total provision (benefit) for income taxes	$ 686	$ 121	$ (12,619)

Income Taxes - Reconciliation of Provision (Benefit) for Income Taxes to Statutory Federal Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Expected federal income tax at statutory rate	$ 593	$ 459	$ 396
State income taxes, net of federal tax effect	78	31	37
Tax impact of foreign activity	44	(8)	55
Permanent book/tax differences	106	23	100
Change in valuation allowance	17	(88)	(1,310)
Release of valuation allowance			(12,802)
Section 382 limitation			415
Change in state deferred rate	53	(162)
Prior year true up	4	(135)	43
General business credit	(202)
State net operating loss adjustment			413
Other	(7)	1	34
Total provision (benefit) for income taxes	$ 686	$ 121	$ (12,619)

Income Taxes - Significant Components of Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Current
Current net operating loss and credit carryforwards	$ 1,258	$ 1,615
Accounts receivable allowance	157	143
Stock-based compensation expense	229	154
Accrued expenses	790	643
Total current deferred tax asset	2,434	2,555
Foreign operations	(53)
Deferred operations	(985)	(784)
Total current deferred tax liability	(1,038)	(784)
Valuation allowance	(124)	(39)
Net current deferred tax asset	1,272	1,732
Non-current
Net operating loss and credit carryforwards	6,145	6,474
Deferred operations	3,029	2,533
Stock-based compensation expense	1,561	1,332
Depreciation and amortization	1,159	738
Other	34	18
Total non-current deferred tax asset	11,928	11,095
Valuation allowance	(1,058)	(242)
Net non-current deferred tax asset	$ 10,870	$ 10,853

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense Benefit [Line Items]
Valuation allowance against our deferred tax assets	$ 1,200,000
Income tax receivable included in prepaid expenses and other current assets	26,000	$ 72,000
Unrecognized tax benefits	0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	0
Domestic Tax Authority [Member]
Income Tax Expense Benefit [Line Items]
Net operating loss carry forwards for U. S. federal tax	71,300,000
Unused federal losses that will expire	17,600,000
Maximum annual limitation of federal net operating losses	990,000
Federal net operating losses	37,000,000
Domestic Tax Authority [Member] \| Research and Development [Member]
Income Tax Expense Benefit [Line Items]
Research and development credit carryforwards	$ 322,000
Research and development credit expire date	2030
Domestic Tax Authority [Member] \| Maximum [Member]
Income Tax Expense Benefit [Line Items]
Expiration of net operating loss carryforwards	Loss carryforwards for federal tax purposes will expire between 2019 and 2034 if not utilized
State and Local Jurisdiction [Member]
Income Tax Expense Benefit [Line Items]
Net operating loss carry forwards for U. S. federal tax	$ 30,300,000
Federal net operating losses	10,200,000
State and Local Jurisdiction [Member] \| Research and Development [Member]
Income Tax Expense Benefit [Line Items]
Research and development credit carryforwards	$ 82,000
Research and development credit expire date	2025
State and Local Jurisdiction [Member] \| Maximum [Member]
Income Tax Expense Benefit [Line Items]
Expiration of net operating loss carryforwards	Loss carryforwards for state tax purposes will expire between 2014 and 2034 if not utilized

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								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator
Net income	$ 294	$ 270	$ 288	$ 199	$ 366	$ 174	$ 426	$ 256	$ 1,051	$ 1,222	$ 13,703
Denominator
Weighted average common shares outstanding, basic									15,201	13,056	11,960
Options to purchase common stock									676	826	784
Restricted stock units									51	26
Employee stock purchase plan									3	2
Weighted average common shares outstanding, diluted									15,931	13,910	12,744
Net income per share
Basic									$ 0.07	$ 0.09	$ 1.15
Diluted	$ 0.02	$ 0.02	$ 0.02	$ 0.01	$ 0.02	$ 0.01	$ 0.03	$ 0.02	$ 0.07	$ 0.09	$ 1.08

Net Income Per Share - Additional Information (Detail)	12 Months Ended
Net Income Per Share - Additional Information (Detail)	Dec. 31, 2013 shares
Earnings Per Share [Abstract]
Outstanding potential common shares excluded from computation of net income per share	1,000

Employee Benefit Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Contribution Pension And Other Postretirement Plans Disclosure [Abstract]
Maximum allowable contribution by employee percentage	100.00%
Defined benefit plan employer matching contribution percent	25.00%
Maximum annual contribution per employee, percent	6.00%
Employer matching contribution Amount	$ 522,000	$ 372,000	$ 287,000

Selected Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Statements of Income Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 27,973	$ 27,008	$ 25,658	$ 23,752	$ 22,484	$ 20,267	$ 17,821	$ 16,534	$ 104,391	$ 77,106	$ 57,969
Gross profit	19,450	18,759	17,715	16,686	15,680	14,322	12,978	12,086	72,610	55,066	42,603
Income from operations	724	371	483	194	224	138	751	459	1,772	1,572	1,135
Net income	$ 294	$ 270	$ 288	$ 199	$ 366	$ 174	$ 426	$ 256	$ 1,051	$ 1,222	$ 13,703
Diluted earnings per share	$ 0.02	$ 0.02	$ 0.02	$ 0.01	$ 0.02	$ 0.01	$ 0.03	$ 0.02	$ 0.07	$ 0.09	$ 1.08

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e565-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details