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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2015	Oct. 22, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	SPSC
Entity Registrant Name	SPS COMMERCE INC
Entity Central Index Key	0001092699
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		16,625,165

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
CURRENT ASSETS
Cash and cash equivalents	$ 117,887	$ 130,795
Short-term marketable securities	5,014
Accounts receivable, less allowance for doubtful accounts of $366 and $279, respectively	17,945	15,422
Deferred costs	14,761	12,055
Deferred income taxes	76	76
Other current assets	5,688	3,846
Total current assets	161,371	162,194
PROPERTY AND EQUIPMENT, net	13,079	11,361
GOODWILL	33,527	34,854
INTANGIBLE ASSETS, net	15,766	18,851
MARKETABLE SECURITIES, non-current	12,514
OTHER ASSETS
Deferred costs, non-current	5,465	5,267
Deferred income taxes, non-current	10,758	11,035
Other non-current assets	397	213
Total assets	252,877	243,775
CURRENT LIABILITIES
Accounts payable	2,381	3,961
Accrued compensation	9,922	9,926
Accrued expenses	2,338	2,470
Deferred revenue	8,072	7,505
Deferred rent	723	698
Total current liabilities	23,436	24,560
OTHER LIABILITIES
Deferred revenue, non-current	11,701	10,653
Deferred rent, non-current	3,015	3,471
Total liabilities	38,152	38,684
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; 16,620,918 and 16,348,747 shares issued and outstanding, respectively	17	16
Additional paid-in capital	260,580	250,633
Accumulated deficit	(41,581)	(44,088)
Accumulated other comprehensive loss	(4,291)	(1,470)
Total stockholders' equity	214,725	205,091
Total liabilities and stockholders' equity	$ 252,877	$ 243,775

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 366	$ 279
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	16,620,918	16,348,747
Common stock, shares outstanding	16,620,918	16,348,747

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenues	$ 40,354	$ 32,506	$ 116,170	$ 92,545
Cost of revenues	12,700	9,970	36,607	28,852
Gross profit	27,654	22,536	79,563	63,693
Operating expenses
Sales and marketing	13,795	12,046	41,640	34,500
Research and development	4,494	3,338	13,058	9,677
General and administrative	6,276	5,153	18,149	14,506
Amortization of intangible assets	829	645	2,507	2,044
Total operating expenses	25,394	21,182	75,354	60,727
Income from operations	2,260	1,354	4,209	2,966
Other income (expense)
Interest income, net	49	52	123	151
Other income (expense), net	(86)	(36)	(255)	(57)
Total other income (expense), net	(37)	16	(132)	94
Income before income taxes	2,223	1,370	4,077	3,060
Income tax expense	(953)	(532)	(1,570)	(1,210)
Net income	$ 1,270	$ 838	$ 2,507	$ 1,850
Net income per share
Basic	$ 0.08	$ 0.05	$ 0.15	$ 0.11
Diluted	$ 0.07	$ 0.05	$ 0.15	$ 0.11
Weighted average common shares used to compute net income per share
Basic	16,605	16,254	16,525	16,207
Diluted	17,054	16,780	17,040	16,793
Other comprehensive income (loss)
Foreign currency translation adjustments	$ (1,733)		$ (4,310)
Unrealized gain on investments	13		19
Comprehensive income (loss)	$ (450)	$ 838	$ (1,784)	$ 1,850

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income	$ 2,507	$ 1,850
Reconciliation of net income to net cash provided by operating activities
Deferred income taxes	277	1,065
Depreciation and amortization of property and equipment	4,693	4,253
Amortization of intangible assets	2,507	2,044
Provision for doubtful accounts	846	507
Stock-based compensation	4,756	3,991
Changes in assets and liabilities
Accounts receivable	(3,427)	(2,490)
Deferred costs	(2,904)	(3,276)
Other current and non-current assets	(2,056)	(929)
Accounts payable	(1,494)	300
Accrued compensation	93	2,063
Accrued expenses	(104)	407
Deferred revenue	1,615	2,077
Deferred rent	(431)	(245)
Net cash provided by operating activities	6,878	11,617
Cash flows from investing activities
Purchases of property and equipment	(6,504)	(4,394)
Purchases of marketable securities	(17,509)
Net cash used in investing activities	(24,013)	(4,394)
Cash flows from financing activities
Net proceeds from exercise of options to purchase common stock	3,273	1,573
Excess tax benefit from exercise of options to purchase common stock	1,179	60
Net proceeds from employee stock purchase plan	741	672
Net cash provided by financing activities	5,193	2,305
Effect of foreign currency exchange rate changes	(966)
Net increase (decrease) in cash and cash equivalents	(12,908)	9,528
Cash and cash equivalents at beginning of period	130,795	131,294
Cash and cash equivalents at end of period	$ 117,887	$ 140,822

General	9 Months Ended
General	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	NOTE A – General Business Description We are a leading provider of cloud-based supply chain management solutions, providing network-proven integrations and comprehensive retail performance analytics to thousands of customers worldwide. We provide our solutions through the SPS Commerce platform, a cloud-based product suite that improves the way suppliers, retailers, distributors and other customers manage and fulfill orders. We derive the majority of our revenues from thousands of monthly recurring subscriptions from businesses that utilize our solutions. Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of SPS Commerce, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in the condensed consolidated financial statements, which have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, these condensed consolidated financial statements do not include all of the information and notes required by GAAP. We have included all normal recurring adjustments considered necessary to give a fair statement of our financial position, results of operations and cash flows for the interim periods shown. Operating results for these interim periods are not necessarily indicative of the results to be expected for the full year. The December 31, 2014 condensed consolidated balance sheet data was derived from our audited financial statements at that date. For further information, refer to the consolidated financial statements and accompanying notes for the year ended December 31, 2014 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on February 20, 2015. Use of Estimates Preparing financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Significant Accounting Policies During the nine months ended September 30, 2015, there were no material changes in our significant accounting policies. See Note A to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2014, as filed with the Securities and Exchange Commission on February 20, 2015, for additional information regarding our significant accounting policies. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board issued new accounting requirements for the recognition of revenue from contracts with customers. These new requirements are effective for annual reporting periods beginning after December 15, 2016, and interim periods within those annual periods. We are currently evaluating the impact of this guidance on our results of operations and financial position.

Financial Instruments

9 Months Ended

Sep. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Financial Instruments

NOTE B – Financial Instruments

We invest primarily in money market funds, highly liquid debt instruments of the U.S. government, and U.S. corporate debt securities. All highly liquid investments with original maturities of 90 days or less are classified as cash equivalents. All investments with original maturities greater than 90 days and remaining maturities less than one year from the balance sheet date are classified as short-term marketable securities. Investments with remaining maturities of more than one year from the balance sheet date are classified as marketable securities, non-current. Short-term marketable securities and marketable securities, non-current, are also classified as available-for-sale. We intend to hold marketable securities until maturity; however, we may sell these securities at any time for use in current operations or for other purposes. Consequently, we may or may not keep securities with stated holding periods to maturity.

Our fixed income investments are carried at fair value and unrealized gains and losses on these investments, net of taxes, are included in accumulated other comprehensive loss in the condensed consolidated balance sheets. Realized gains or losses are included in other income (expense) in the condensed consolidated statements of comprehensive income (loss). When a determination has been made that an other-than-temporary decline in fair value has occurred, the amount of the decline that is related to a credit loss is realized and is included in other income (expense), net in the condensed consolidated statements of comprehensive income (loss).

Cash equivalents and marketable securities, consisted of the following (in thousands):


	September 30, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value

Cash equivalents:
Money market funds	$	102,167	$	—	$	—		$	102,167

Marketable securities:
Corporate bonds		5,024		—		—			5,024
Commercial paper		2,499		—		(2	)		2,497
U.S. treasury securities		7,489		15		—			7,504
U.S. agency obligations		2,497		6		—			2,503

	$	119,676	$	21	$	(2	)	$	119,695


Due within one year								$	107,181
Due within two years									12,514

Total								$	119,695

We do not believe any of the unrealized losses represent an other-than-temporary impairment based on our valuation of available evidence as of September 30, 2015. We expect to receive the full principal and interest on all of these cash equivalents and marketable securities.

Fair Value Measurements

We measure certain financial assets at fair value on a recurring basis based on a fair value hierarchy that requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The three levels of inputs that may be used to measure fair value are:

•

Level 1 – quoted prices in active markets for identical assets or liabilities

•

Level 2 – observable inputs other than Level 1 prices, such as (a) quoted prices for similar assets or liabilities, (b) quoted prices in markets with insufficient volume or infrequent transactions (less active markets), or (c) model-derived valuations in which all significant inputs are observable or can be derived principally from or corroborated by observable market data for substantially the full term of the assets or liabilities.

•

Level 3 – unobservable inputs to the valuation methodology that are significant to the measurement of fair value of assets or liabilities.

Level 1 Measurements

Our cash equivalents held in money market funds are measured at fair value using level 1 inputs.

Level 2 Measurements

Our available-for-sale U.S. treasury securities, U.S. agency obligations, commercial paper and corporate debt securities are measured at fair value using level 2 inputs. We obtain the fair values of our level 2 available-for-sale securities from a professional pricing service.

The following table presents information about our financial assets that are measured at fair value on a recurring basis and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value (in thousands):


	Level 1		Level 2		Level 3		Total

Assets at September 30, 2015:
Cash and cash equivalents:
Money market funds		102,167		—		—		102,167
Marketable securities:
Corporate bonds		—		5,024		—		5,024
Commercial paper		—		2,497		—		2,497
U.S. treasury securities		—		7,504		—		7,504
U.S. agency obligations		—		2,503		—		2,503

	$	102,167	$	17,528	$	—	$	119,695


Assets at December 31, 2014:
Cash and cash equivalents:
Money market funds		91,746		—		—		91,746

	$	91,746	$	—	$	—	$	91,746

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Goodwill and Intangible Assets, net

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, net

NOTE C – Goodwill and Intangible Assets, net

The change in our goodwill for the nine months ended September 30, 2015 was due to the effect of foreign currency translation.

Intangible assets included the following (in thousands):


	September 30, 2015							December 31, 2014
	Carrying Amount		Accumulated Amortization			Net		Carrying Amount		Accumulated Amortization			Net
Subscriber relationships	$	26,260	$	(11,169	)	$	15,091	$	26,724	$	(8,992	)	$	17,732
Non-competition agreements		1,833		(1,640	)		193		1,849		(1,581	)		268
Technology and other		824		(342	)		482		922		(71	)		851

	$	28,917	$	(13,151	)	$	15,766	$	29,495	$	(10,644	)	$	18,851

At September 30, 2015, future amortization expense for intangible assets was as follows (in thousands):


Remainder of 2015	$	814
2016		3,256
2017		3,008
2018		2,425
2019		2,134
Thereafter		4,129

	$	15,766

- 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	9 Months Ended
Line of Credit	Sep. 30, 2015
Debt Disclosure [Abstract]
Line of Credit	NOTE D – Line of Credit We have a revolving credit agreement with JPMorgan Chase Bank, N.A. which provides for a $20 million revolving credit facility that we may draw upon from time to time, subject to certain terms and conditions, and will mature on September 30, 2016. There were no borrowings outstanding at September 30, 2015 and we were in compliance with all covenants under the revolving credit agreement as of that date.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE E – Commitments and Contingencies

Operating Leases

On September 1, 2015, we executed a new lease agreement at our New Jersey office location which commences on February 1, 2016 and expires on June 30, 2023. The lease includes a right of first offer to lease certain additional space and one option to extend the term of the lease for five years at a market rate determined in accordance with the lease. There was also a rent holiday of 5 months which has been incorporated into our deferred rent calculation.

At September 30, 2015, our future minimum payments under operating leases were as follows (in thousands):


2015	$	768
2016		3,143
2017		2,920
2018		2,931
2019		3,027
Thereafter		3,866

	$	16,655

Stock-Based Compensation

9 Months Ended

Sep. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

NOTE F – 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 2015, 980,924 additional shares were reserved for future issuance under our 2010 Equity Incentive Plan. At September 30, 2015, there were approximately 3.3 million shares available for grant under approved equity compensation plans.

We recorded stock-based compensation expense of $1.6 million and $4.8 million for the three and nine months ended September 30, 2015 and $1.3 million and $4.0 million for the three and nine months ended September 30, 2014, respectively. This expense was allocated as follows (in thousands):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014

Cost of revenues	$	256	$	134	$	716	$	439
Operating expenses
Sales and marketing		466		469		1,490		1,423
Research and development		178		134		486		322
General and administrative		710		556		2,064		1,807

Total stock-based compensation expense	$	1,610	$	1,293	$	4,756	$	3,991

At September 30, 2015, there was approximately $12.7 million of unrecognized stock-based compensation expense under our equity compensation plans, which is expected to be recognized on a straight line basis over a weighted average period of 2.7 years.

Stock Options

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


				Weighted Average
	Options			Exercise Price
	(#)			($/share)

Outstanding at December 31, 2014		1,085,463		$	26.53
Granted		178,654			67.39
Exercised		(215,126	)		15.21
Forfeited		(17,744	)		45.62

Outstanding at September 30, 2015		1,031,247			35.64

Of the total outstanding options at September 30, 2015, 696,300 were exercisable with a weighted average exercise price of $24.57 per share. The total outstanding options had a weighted average remaining contractual life of 4.8 years.

The weighted average fair value per share of options granted during the first nine months of 2015 was $23.07 and this was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:


Volatility	39.0	%
Dividend yield	0	%
Life (in years)	4.5
Risk-free interest rate	1.1%-1.5	%

As discussed in Note J to our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2014, beginning in 2015, the volatility assumption used for the Black-Scholes option pricing model is now based solely on the historical volatility of our common stock. Previously, we estimated volatility based partially on the historical volatilities of the publicly traded shares of a selected peer group and partially on the historical volatility of our common stock.

Restricted Stock Units and Awards

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

Our restricted stock units activity was as follows:


	Restricted Stock Units (#)			Weighted Average Grant Date Fair Value ($/share)

Outstanding at December 31, 2014		115,133		$	45.25
Granted		67,051			67.39
Vested and common stock issued		(37,537	)		40.86
Forfeited		(4,909	)		53.90

Outstanding at September 30, 2015		139,738			56.75

The number of restricted stock units outstanding at September 30, 2015 included 27,171 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 December 31, 2014		1,338		$	51.74
Restricted common stock issued		4,110			67.37
Restrictions lapsed		(3,390	)		61.20
Forfeited		—			—

Outstanding at September 30, 2015		2,058			67.37

Employee Stock Purchase Plan

Our employee stock purchase plan allows participating employees to purchase shares of our common stock at a discount through payroll deductions. The plan is available to all employees subject to certain eligibility requirements. Participating employees may purchase common stock, on a voluntary after tax basis, at a price that is the lower of 85% of the fair market value of one share of common stock at the beginning or end of each stock purchase period. The plan consists of two six-month offering periods, beginning on January 1 and July 1 of each calendar year. A total of 1.1 million shares of common stock are reserved for issuance under the plan.

For the offering period that began on January 1, 2015 and ended June 30, 2015, we withheld approximately $748,000 from employees participating in the plan. On June 30, 2015, approximately $741,000 of these funds was used to purchase 15,398 shares on behalf of the employees participating in the plan. The remaining funds were refunded to employees pursuant to the requirements of the plan. For the offering period that began on July 1, 2015 and will end on December 31, 2015, we have withheld approximately $417,000 as of September 30, 2015 from employees participating in the plan.

For the three and nine months ended September 30, 2015, we recorded approximately $102,000 and $312,000, respectively, 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 weighted-average assumptions:


Volatility	46.0	%
Dividend yield	0	%
Life (in years)	0.5
Risk-free interest rate	0.1	%

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	NOTE G – Income Taxes We record our interim provision for income taxes by applying our estimated annual effective tax rate to our year-to-date pretax income and adjust the provision for discrete tax items recorded in the period. Differences between our effective tax rate and statutory tax rates are primarily due to the impact of meals and entertainment expense and employee stock purchase plan expense. Our provisions for income taxes included current foreign and state income tax expense, as well as deferred tax expense. As of September 30, 2015 we do not have any unrecognized tax benefits nor any accrued interest or tax benefits.

Net Income Per Share

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Net Income Per Share

NOTE H – Net Income Per Share

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

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


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014

Numerator
Net income	$	1,270	$	838	$	2,507	$	1,850

Denominator
Weighted average common shares outstanding, basic		16,605		16,254		16,525		16,207
Options to purchase common stock		420		488		487		544
Restricted stock units		28		36		25		41
Employee stock purchase plan		1		2		3		1

Weighted average common shares outstanding, diluted		17,054		16,780		17,040		16,793


Net income per share
Basic	$	0.08	$	0.05	$	0.15	$	0.11
Diluted	$	0.07	$	0.05	$	0.15	$	0.11

The effect of approximately 2,000 and 126,000 outstanding potential common shares was excluded from the calculation of diluted net income per share for the three and nine months ended September 30, 2015 and 2014, respectively, as they were anti-dilutive.

General (Policies)	9 Months Ended
General (Policies)	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Description	Business Description We are a leading provider of cloud-based supply chain management solutions, providing network-proven integrations and comprehensive retail performance analytics to thousands of customers worldwide. We provide our solutions through the SPS Commerce platform, a cloud-based product suite that improves the way suppliers, retailers, distributors and other customers manage and fulfill orders. We derive the majority of our revenues from thousands of monthly recurring subscriptions from businesses that utilize our solutions.
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of SPS Commerce, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in the condensed consolidated financial statements, which have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, these condensed consolidated financial statements do not include all of the information and notes required by GAAP. We have included all normal recurring adjustments considered necessary to give a fair statement of our financial position, results of operations and cash flows for the interim periods shown. Operating results for these interim periods are not necessarily indicative of the results to be expected for the full year. The December 31, 2014 condensed consolidated balance sheet data was derived from our audited financial statements at that date. For further information, refer to the consolidated financial statements and accompanying notes for the year ended December 31, 2014 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on February 20, 2015.
Use of Estimates	Use of Estimates Preparing financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.
Significant Accounting Policies	Significant Accounting Policies During the nine months ended September 30, 2015, there were no material changes in our significant accounting policies. See Note A to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2014, as filed with the Securities and Exchange Commission on February 20, 2015, for additional information regarding our significant accounting policies.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board issued new accounting requirements for the recognition of revenue from contracts with customers. These new requirements are effective for annual reporting periods beginning after December 15, 2016, and interim periods within those annual periods. We are currently evaluating the impact of this guidance on our results of operations and financial position.

Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Summary of Investment in Cash Equivalents and Marketable Securities

Cash equivalents and marketable securities, consisted of the following (in thousands):


	September 30, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value

Cash equivalents:
Money market funds	$	102,167	$	—	$	—		$	102,167

Marketable securities:
Corporate bonds		5,024		—		—			5,024
Commercial paper		2,499		—		(2	)		2,497
U.S. treasury securities		7,489		15		—			7,504
U.S. agency obligations		2,497		6		—			2,503

	$	119,676	$	21	$	(2	)	$	119,695


Due within one year								$	107,181
Due within two years									12,514

Total								$	119,695

Summary of Financial Assets Measured at Fair Value on a Recurring Basis


	Level 1		Level 2		Level 3		Total

Assets at September 30, 2015:
Cash and cash equivalents:
Money market funds		102,167		—		—		102,167
Marketable securities:
Corporate bonds		—		5,024		—		5,024
Commercial paper		—		2,497		—		2,497
U.S. treasury securities		—		7,504		—		7,504
U.S. agency obligations		—		2,503		—		2,503

	$	102,167	$	17,528	$	—	$	119,695


Assets at December 31, 2014:
Cash and cash equivalents:
Money market funds		91,746		—		—		91,746

	$	91,746	$	—	$	—	$	91,746

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Goodwill and Intangible Assets, net (Tables)

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible assets included the following (in thousands):


	September 30, 2015							December 31, 2014
	Carrying Amount		Accumulated Amortization			Net		Carrying Amount		Accumulated Amortization			Net
Subscriber relationships	$	26,260	$	(11,169	)	$	15,091	$	26,724	$	(8,992	)	$	17,732
Non-competition agreements		1,833		(1,640	)		193		1,849		(1,581	)		268
Technology and other		824		(342	)		482		922		(71	)		851

	$	28,917	$	(13,151	)	$	15,766	$	29,495	$	(10,644	)	$	18,851

Future Amortization Expense for Intangible Assets

At September 30, 2015, future amortization expense for intangible assets was as follows (in thousands):


Remainder of 2015	$	814
2016		3,256
2017		3,008
2018		2,425
2019		2,134
Thereafter		4,129

	$	15,766

Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Payments Under Operating Leases

At September 30, 2015, our future minimum payments under operating leases were as follows (in thousands):


2015	$	768
2016		3,143
2017		2,920
2018		2,931
2019		3,027
Thereafter		3,866

	$	16,655

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2015

Stock-Based Compensation Expense

This expense was allocated as follows (in thousands):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014

Cost of revenues	$	256	$	134	$	716	$	439
Operating expenses
Sales and marketing		466		469		1,490		1,423
Research and development		178		134		486		322
General and administrative		710		556		2,064		1,807

Total stock-based compensation expense	$	1,610	$	1,293	$	4,756	$	3,991

Stock Option Activity

Our stock option activity was as follows:


				Weighted Average
	Options			Exercise Price
	(#)			($/share)
Outstanding at December 31, 2014		1,085,463		$	26.53
Granted		178,654			67.39
Exercised		(215,126	)		15.21
Forfeited		(17,744	)		45.62

Outstanding at September 30, 2015		1,031,247			35.64

Weighted Average Fair Value Per Share of Options Granted, Assumptions


Volatility	39.0	%
Dividend yield	0	%
Life (in years)	4.5
Risk-free interest rate	1.1%-1.5	%

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 weighted-average assumptions:


Volatility	46.0	%
Dividend yield	0	%
Life (in years)	0.5
Risk-free interest rate	0.1	%

Restricted Stock Units [Member]

Restricted Stock Units and Restricted Stock Awards

Our restricted stock units activity was as follows:


	Restricted Stock Units (#)			Weighted Average Grant Date Fair Value ($/share)
Outstanding at December 31, 2014		115,133		$	45.25
Granted		67,051			67.39
Vested and common stock issued		(37,537	)		40.86
Forfeited		(4,909	)		53.90

Outstanding at September 30, 2015		139,738			56.75

Restricted Stock Award [Member]

Restricted Stock Units and Restricted Stock Awards

Our restricted stock awards activity was as follows:


	Restricted Stock Awards (#)			Weighted Average Grant Date Fair Value ($/share)
Outstanding at December 31, 2014		1,338		$	51.74
Restricted common stock issued		4,110			67.37
Restrictions lapsed		(3,390	)		61.20
Forfeited		—			—

Outstanding at September 30, 2015		2,058			67.37

Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Components of Computation of Basic and Diluted Net Income Per Share

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


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014

Numerator
Net income	$	1,270	$	838	$	2,507	$	1,850

Denominator
Weighted average common shares outstanding, basic		16,605		16,254		16,525		16,207
Options to purchase common stock		420		488		487		544
Restricted stock units		28		36		25		41
Employee stock purchase plan		1		2		3		1

Weighted average common shares outstanding, diluted		17,054		16,780		17,040		16,793


Net income per share
Basic	$	0.08	$	0.05	$	0.15	$	0.11
Diluted	$	0.07	$	0.05	$	0.15	$	0.11

Financial Instruments - Summary of Investment in Cash Equivalents and Marketable Securities (Detail) $ in Thousands	Sep. 30, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 119,676
Due within one year	107,181
Unrealized Gains	21
Due within two years	12,514
Unrealized Losses	(2)
Fair Value	119,695
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	102,167
Fair Value	102,167
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,024
Fair Value	5,024
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,499
Unrealized Losses	(2)
Fair Value	2,497
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,489
Unrealized Gains	15
Fair Value	7,504
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,497
Unrealized Gains	6
Fair Value	$ 2,503

Financial Instruments - Summary of Financial Assets Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Line Items]
Assets fair value	$ 119,695	$ 91,746
Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	102,167	91,746
Corporate Bonds [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	5,024
Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	2,497
U.S. Treasury Securities [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	7,504
U.S. Agency Obligations [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	2,503
Level 1 [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	102,167	91,746
Level 1 [Member] \| Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	102,167	$ 91,746
Level 2 [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	17,528
Level 2 [Member] \| Corporate Bonds [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	5,024
Level 2 [Member] \| Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	2,497
Level 2 [Member] \| U.S. Treasury Securities [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	7,504
Level 2 [Member] \| U.S. Agency Obligations [Member]
Cash and Cash Equivalents [Line Items]
Assets fair value	$ 2,503

Goodwill and Intangible Assets, net - Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	$ 28,917	$ 29,495
Accumulated Amortization	(13,151)	(10,644)
Net	15,766	18,851
Subscriber Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	26,260	26,724
Accumulated Amortization	(11,169)	(8,992)
Net	15,091	17,732
Non-competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	1,833	1,849
Accumulated Amortization	(1,640)	(1,581)
Net	193	268
Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	824	922
Accumulated Amortization	(342)	(71)
Net	$ 482	$ 851

Goodwill and Intangible Assets, net - Future Amortization Expense for Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2015	$ 814
2016	3,256
2017	3,008
2018	2,425
2019	2,134
Thereafter	4,129
Net	$ 15,766	$ 18,851

Line of Credit - Additional Information (Detail)	9 Months Ended
Line of Credit - Additional Information (Detail)	Sep. 30, 2015 USD ($)
Line of Credit Facility [Line Items]
Revolving credit facility, amount	$ 20,000,000
Revolving credit facility, maturity date	Sep. 30, 2016
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowings outstanding revolving credit agreement	$ 0

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Commitments and Contingencies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015 OptionPlan
Commitments and Contingencies Disclosure [Abstract]
Lease agreement expires, date	Jun. 30, 2023
Number of options to extend term of the lease	1
Options to extend the term of the lease, number of years	5 years

Commitments and Contingencies - Future Minimum Payments Under Operating Leases (Detail) $ in Thousands	Sep. 30, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2015	$ 768
2016	3,143
2017	2,920
2018	2,931
2019	3,027
Thereafter	3,866
Operating leases, total	$ 16,655

Stock-Based Compensation - Additional Information (Detail)	1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended
	Jan. 31, 2015 shares	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) shares	Sep. 30, 2015 USD ($) OfferingPeriods $ / shares shares	Sep. 30, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant \| shares		3,300,000			3,300,000
Stock-based compensation expense \| $		$ 1,610,000	$ 1,293,000		$ 4,756,000	$ 3,991,000
Unrecognized stock-based compensation expense \| $		$ 12,700,000			$ 12,700,000
Unrecognized stock-based compensation, expected to be recognized, weighted average period					2 years 8 months 12 days
Stock options vest, period					4 years
Stock options contractual term, from the date of grant					Seven to ten years
Stock options exercisable \| shares		696,300			696,300
Weighted average exercise price \| $ / shares		$ 24.57			$ 24.57
Weighted average remaining contractual life					4 years 9 months 18 days
Weighted average fair value per share of options granted \| $ / shares					$ 23.07
Number of RSU's vested and not issued during the period \| shares					27,171
Percentage of common stock on fair market value					85.00%
Number of offerings per year \| OfferingPeriods					2
Net proceeds from employee stock purchase plan \| $					$ 741,000	$ 672,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 102,000			$ 312,000
Common stock reserved for future issuance \| shares		1,100,000			1,100,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vest, period					4 years
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards units vest over, period					1 year
Equity Incentive Plan [Member] \| 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares were authorized under 2010 Equity Incentive Plan \| shares	980,924
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan, employees contribution \| $		$ 417,000		$ 748,000	$ 417,000
Employee stock purchase plan, shares purchased \| shares				15,398
Net proceeds from employee stock purchase plan \| $				$ 741,000
Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options contractual term range					10 years
Minimum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options contractual term range					7 years

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 1,610	$ 1,293	$ 4,756	$ 3,991
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	256	134	716	439
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	466	469	1,490	1,423
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	178	134	486	322
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 710	$ 556	$ 2,064	$ 1,807

Stock-Based Compensation - Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options Outstanding, Beginning balance \| shares	1,085,463
Options, Granted \| shares	178,654
Options, Exercised \| shares	(215,126)
Options, Forfeited \| shares	(17,744)
Options Outstanding, Ending balance \| shares	1,031,247
Weighted Average Exercise Price, Outstanding, Beginning Balance \| $ / shares	$ 26.53
Weighted Average Exercise Price, Granted \| $ / shares	67.39
Weighted Average Exercise Price, Exercised \| $ / shares	15.21
Weighted Average Exercise Price, Forfeited \| $ / shares	45.62
Weighted Average Exercise Price, Outstanding, Ending Balance \| $ / shares	$ 35.64

Stock-Based Compensation - Weighted Average Fair Value Per Share of Options Granted, Assumptions (Detail) - Stock Options [Member]	9 Months Ended
	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	39.00%
Dividend yield	0.00%
Life (in years)	4 years 6 months
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.10%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.50%

Stock-Based Compensation - Restricted Stock Units (Detail) - Restricted Stock Units [Member]	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding, Beginning Balance \| shares	115,133
Granted, stock units \| shares	67,051
Vested, stock units \| shares	(37,537)
Forfeited, stock units \| shares	(4,909)
Stock awards, Outstanding, Ending Balance \| shares	139,738
Weighted average grant date fair value, Outstanding, Beginning Balance \| $ / shares	$ 45.25
Granted, Weighted Average Grant Date Fair Value \| $ / shares	67.39
Vested, Weighted Average Grant Date Fair Value \| $ / shares	40.86
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	53.90
Weighted average grant date fair value, Outstanding, Ending Balance \| $ / shares	$ 56.75

Stock-Based Compensation - Restricted Stock Awards (Detail) - Restricted Stock Award [Member]	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding, Beginning Balance \| shares	1,338
Restricted common stock issued, stock awards \| shares	4,110
Restrictions lapsed, stock awards \| shares	(3,390)
Forfeited, stock awards \| shares	0
Stock awards, Outstanding, Ending Balance \| shares	2,058
Weighted average grant date fair value, Outstanding, Beginning Balance \| $ / shares	$ 51.74
Restricted common stock issued, Weighted Average Grant Date Fair Value \| $ / shares	67.37
Restrictions lapsed, Weighted Average Grant Date Fair Value \| $ / shares	61.20
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	0
Weighted average grant date fair value, Outstanding, Ending Balance \| $ / shares	$ 67.37

Stock-Based Compensation - Fair Value Estimation of Common Stock Using Black-Scholes Option Pricing Model, Assumptions (Detail) - Employee Stock Purchase Plan [Member]	9 Months Ended
	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	46.00%
Dividend yield	0.00%
Life (in years)	6 months
Risk-free interest rate	0.10%

Income Taxes - Additional Information (Detail)	Sep. 30, 2015 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 0

Net Income Per Share - Components of Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator
Net income	$ 1,270	$ 838	$ 2,507	$ 1,850
Denominator
Weighted average common shares outstanding, basic	16,605	16,254	16,525	16,207
Options to purchase common stock	420	488	487	544
Restricted stock units	28	36	25	41
Employee stock purchase plan	1	2	3	1
Weighted average common shares outstanding, diluted	17,054	16,780	17,040	16,793
Net income per share
Basic	$ 0.08	$ 0.05	$ 0.15	$ 0.11
Diluted	$ 0.07	$ 0.05	$ 0.15	$ 0.11

Net Income Per Share - Additional Information (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Outstanding potential common shares excluded from computation of net income per share	2	126	2	126