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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2017	Apr. 24, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Trading Symbol	SPSC
Entity Registrant Name	SPS COMMERCE INC
Entity Central Index Key	0001092699
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		17,192,634

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 128,707	$ 115,877
Short-term marketable securities	25,550	23,076
Accounts receivable, less allowance for doubtful accounts of $597 and $515, respectively	22,683	20,746
Deferred costs	20,908	19,224
Other current assets	6,992	7,010
Total current assets	204,840	185,933
PROPERTY AND EQUIPMENT, net	15,066	15,314
GOODWILL	50,289	49,777
INTANGIBLE ASSETS, net	19,389	19,788
MARKETABLE SECURITIES, non-current	2,503	7,494
OTHER ASSETS
Deferred costs, non-current	6,051	6,086
Deferred income tax asset, non-current	28,408	12,446
Other non-current assets	1,372	1,527
Total assets	327,918	298,365
CURRENT LIABILITIES
Accounts payable	3,580	2,302
Accrued compensation	12,272	13,740
Accrued expenses	4,459	3,508
Deferred revenue	15,803	11,055
Deferred rent	1,504	1,556
Total current liabilities	37,618	32,161
OTHER LIABILITIES
Deferred revenue, non-current	11,087	10,847
Deferred rent, non-current	3,912	4,179
Deferred income tax liability, non-current	1,895	1,911
Total liabilities	54,512	49,098
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; 17,200,526 and 17,081,145 shares issued and outstanding, respectively	17	17
Additional paid-in capital	289,652	286,315
Accumulated deficit	(14,490)	(33,739)
Accumulated other comprehensive loss	(1,773)	(3,326)
Total stockholders' equity	273,406	249,267
Total liabilities and stockholders' equity	$ 327,918	$ 298,365

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 597	$ 515
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	17,200,526	17,081,145
Common stock, shares outstanding	17,200,526	17,081,145

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenues	$ 51,932	$ 45,599
Cost of revenues	17,330	14,881
Gross profit	34,602	30,718
Operating expenses
Sales and marketing	17,079	15,889
Research and development	5,105	5,069
General and administrative	7,827	7,285
Amortization of intangible assets	1,215	1,161
Total operating expenses	31,226	29,404
Income from operations	3,376	1,314
Other income (expense)
Interest income, net	191	145
Other income (expense), net	(60)	293
Total other income (expense), net	131	438
Income before income taxes	3,507	1,752
Income tax expense	(536)	(708)
Net income	$ 2,971	$ 1,044
Net income per share
Basic	$ 0.17	$ 0.06
Diluted	$ 0.17	$ 0.06
Weighted average common shares used to compute net income per share
Basic	17,154	16,783
Diluted	17,393	17,029
Other comprehensive income (loss)
Foreign currency translation adjustments	$ 1,577	$ 2,821
Unrealized gain on investments (net of tax of ($5) and $47)	(8)	76
Reclassification of gain on investments into earnings (net of tax of ($9) and $0)	(16)	(1)
Comprehensive income (loss)	$ 4,524	$ 3,940

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Tax on net unrealized gain (losses) on investment securities available for sale	$ (5)	$ 47
Reclassification of gain on investments into earnings, tax	$ (9)	$ 0

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income	$ 2,971	$ 1,044
Reconciliation of net income to net cash provided by operating activities
Deferred income taxes	310	(302)
Share-based earn-out liability		(365)
Depreciation and amortization of property and equipment	1,691	1,626
Amortization of intangible assets	1,215	1,161
Provision for doubtful accounts	332	304
Stock-based compensation	2,300	1,927
Other, net	(25)
Changes in assets and liabilities
Accounts receivable	(2,201)	(2,189)
Deferred costs	(1,649)	(765)
Other current and non-current assets	180	99
Accounts payable	1,169	1,694
Accrued compensation	(1,508)	(319)
Accrued expenses	945	(90)
Deferred revenue	4,988	3,019
Deferred rent	(319)	67
Net cash provided by operating activities	10,399	6,911
Cash flows from investing activities
Purchases of property and equipment	(1,299)	(2,116)
Purchases of marketable securities	(4,995)	(2,495)
Maturities of marketable securities	7,500	2,500
Acquisitions of businesses and intangible assets, net of cash acquired	(500)	(17,942)
Net cash provided by (used in) investing activities	706	(20,053)
Cash flows from financing activities
Net proceeds from exercise of options to purchase common stock	1,037	1,069
Excess tax benefits from exercise of options to purchase common stock		1,021
Net cash provided by financing activities	1,037	2,090
Effect of foreign currency exchange rate changes	688	403
Net increase (decrease) in cash and cash equivalents	12,830	(10,649)
Cash and cash equivalents at beginning of period	115,877	121,538
Cash and cash equivalents at end of period	$ 128,707	$ 110,889

General	3 Months Ended
General	Mar. 31, 2017
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, 2016 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, 2016 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on February 27, 2017. Use of Estimates Preparing financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Significant Accounting Policies During the three months ended March 31, 2017, 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, 2016, as filed with the Securities and Exchange Commission on February 27, 2017, for additional information regarding our significant accounting policies. Recently Adopted Accounting Pronouncements In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). The new guidance requires excess tax benefits and tax deficiencies to be recorded in the income statement when the awards vest or are settled and provides an accounting policy election to account for forfeitures as they occur. In addition, cash flows related to excess tax benefits will no longer be separately classified as a financing activity apart from other income tax cash flows within operating activities. The standard also allows entities to repurchase more of an employee’s shares for tax withholding purposes without triggering liability accounting and clarifies that all cash payments made on an employee’s behalf for withheld shares should be presented as a financing activity on the statements of cash flows. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016, with early adoption permitted. We adopted ASU 2016-09 during the three months ended March 31, 2017. The impact to our consolidated balance sheet as of January 1, 2017 was a $16.3 million increase in deferred income tax assets, non-current and a corresponding $16.3 million decrease in accumulated deficit. This impact results from the cumulative-effect adjustment for previously unrecognized excess tax benefits using the modified retrospective method required by the new standard. We elected to adopt the changes in cash flow statement presentation prospectively to be consistent with the prospective transition for the treatment of excess tax benefits in the income statement. Accordingly, we no longer classify excess tax benefits as a financing activity subsequent to January 1, 2017. Recently Issued Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance will replace most existing revenue recognition guidance in GAAP when it becomes effective. These new requirements are effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods. We do not believe the new revenue recognition standard will materially impact our recognition of the primary fees received from customers for our cloud-based supply chain solutions. We believe the adoption of the new standard could impact our accounting for certain upfront set-up fees and the periods over which the related revenues are recognized, as well as the timing of cost recognition for sales commissions and other contract acquisition costs. We are currently evaluating implementation methods and the extent of the impact that implementation of this standard will have on our consolidated financial statements upon adoption In February 2016, the FASB issued ASU 2016-02, Leases which will supersede the existing lease guidance and will require all leases with a term greater than 12 months to be recognized in the statements of financial position and eliminate current real estate-specific lease guidance, while maintaining substantially similar classification criteria for distinguishing between finance leases and operating leases. This standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. We believe the adoption of the new lease accounting standard will materially impact our consolidated financial statements by increasing our non-current assets and non-current liabilities on our consolidated balance sheets in order to record the right of use assets and related lease liabilities for our existing operating leases. We are in the process of determining the financial statement impact and are currently unable to estimate the impact on our consolidated financial statements.

Financial Instruments

3 Months Ended

Mar. 31, 2017

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 are included in other comprehensive income (loss) in the condensed consolidated statements of comprehensive income (loss). 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:


	March 31, 2017
	Amortized Cost		Unrealized Gains (Losses)			Fair Value
	(Dollars in thousands)
Cash equivalents:
Money market funds	$	80,310	$	—		$	80,310
Marketable securities:
Corporate bonds		15,681		(120	)		15,561
Commercial paper		4,995		—			4,995
U.S. treasury securities		7,489		8			7,497

	$	108,475	$	(112	)	$	108,363


Due within one year						$	105,860
Due within two years							2,503

Total						$	108,363


	December 31, 2016
	Amortized Cost		Unrealized Gains (Losses)			Fair Value
	(Dollars in thousands)
Cash equivalents:
Money market funds	$	75,375	$	—		$	75,375
Marketable securities:
Corporate bonds		15,681		(96	)		15,585
Commercial paper		4,977		10			4,987
U.S. treasury securities		7,489		10			7,499
U.S. agency obligations		2,497		3			2,500

	$	106,019	$	(73	)	$	105,946


Due within one year						$	98,452
Due within two years							7,494

Total						$	105,946

We do not believe any of the unrealized losses represent an other-than-temporary impairment based on our valuation of available evidence as of March 31, 2017. 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 tables present 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:


	March 31, 2017
	Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets:
Cash and cash equivalents:
Money market funds	$	80,310	$	—	$	—	$	80,310
Marketable securities:
Corporate bonds		—		15,561		—		15,561
Commerical paper		—		4,995		—		4,995
U.S. treasury securities		—		7,497		—		7,497

Total	$	80,310	$	28,053	$	—	$	108,363


	December 31, 2016
	Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets:
Cash and cash equivalents:
Money market funds	$	75,375	$	—	$	—	$	75,375
Marketable securities:
Corporate bonds		—		15,585		—		15,585
Commerical paper		—		4,987		—		4,987
U.S. treasury securities		—		7,499		—		7,499
U.S. agency obligations		—		2,500		—		2,500

Total	$	75,375	$	30,571	$	—	$	105,946

We classify our cash and cash equivalents and marketable securities within Level 1 or Level 2 because we use quoted market prices or alternative pricing sources and models utilizing market observable inputs to determine their fair value.

- Definition

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

+ References + Details

Goodwill and Intangible Assets, net

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, net

NOTE C – Goodwill and Intangible Assets, net

Changes in the carrying amount of goodwill for the three months ended March 31, 2017 and 2016 are as follows:


	2017
	(Dollars in thousands)
Balances, January 1	$	49,777
Goodwill acquired during the period		—
Foreign currency translation adjustments		512

Balances, March 31	$	50,289

Intangible assets subject to amortization primarily include subscriber relationships, non-competition agreements and acquired technology and are amortized over their respective useful lives (ranging from 1 to 9 years).


	March 31, 2017
	Carrying Amount		Accumulated Amortization			Foreign Currency Translation		Net
	(Dollars in thousands)
Subscriber relationships	$	34,350	$	(16,633	)	$	187	$	17,904
Non-competition agreements		2,499		(1,910	)		17		606
Technology and other		2,131		(1,264	)		12		879

	$	38,980	$	(19,807	)	$	216	$	19,389


	December 31, 2016
	Carrying Amount		Accumulated Amortization			Foreign Currency Translation		Net
	(Dollars in thousands)
Subscriber relationships	$	33,736	$	(15,708	)	$	295	$	18,323
Non-competition agreements		2,234		(1,818	)		17		433
Technology and other		2,089		(1,120	)		63		1,032

	$	38,059	$	(18,646	)	$	375	$	19,788

Information regarding intangible assets included on our consolidated balance sheets is as follows:

Total amortization expense for intangible assets during the three months ended March 31, 2017 and 2016 was $1.2 million and $1.2 million, respectively. The estimated annual amortization expense related to intangible assets subject to amortization for the next five years is as follows:


	(Dollars in thousands)
Remainder of 2017	$	3,322
2018		3,927
2019		3,636
2020		3,290
2021		2,453
Thereafter		2,761

	$	19,389

- 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

Commitments and Contingencies

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE D – Commitments and Contingencies

Operating Leases

At March 31, 2017, our future minimum payments under operating leases were as follows:


	(Dollars in thousands)
Remainder of 2017	$	2,438
2018		3,128
2019		3,217
2020		1,814
2021		1,035
Thereafter		1,174

	$	12,806

Stock-Based Compensation

3 Months Ended

Mar. 31, 2017

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

Stock-Based Compensation

NOTE E – Stock-Based Compensation

Our equity compensation plans provide for the grant of incentive and nonqualified stock options, as well as other stock-based awards including restricted stock, restricted stock units and performance share 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 February 2017, 1,024,868 additional shares were reserved for future issuance under our 2010 Equity Incentive Plan. As of March 31, 2017, there were approximately 4.5 million shares available for grant under approved equity compensation plans.

We recorded stock-based compensation expense of $2.3 million and $1.9 million for the three months ended March 31, 2017 and 2016, respectively. This expense was allocated as follows:


	Three Months Ended March 31,
	2017		2016
	(Dollars in thousands)
Cost of revenues	$	451	$	280
Operating expenses
Sales and marketing		517		654
Research and development		229		138
General and administrative		1,103		855

Total stock-based compensation expense	$	2,300	$	1,927

As of March 31, 2017, there was approximately $23.4 million of unrecognized stock-based compensation expense under our equity compensation plans, which is expected to be recognized on a straight-line basis over a weighted average period of 3.0 years.

Stock Options

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


	Options			Weighted Average Exercise Price
	(#)			($/share)
Outstanding at December 31, 2016		1,016,012		$	44.72
Granted		147,848			55.70
Exercised		(54,564	)		18.99
Forfeited		(5,267	)		54.03

Outstanding at March 31, 2017		1,104,029			47.42

Of the total outstanding options at March 31, 2017, 630,995 were exercisable with a weighted average exercise price of $42.11 per share. The total outstanding options had a weighted average remaining contractual life of 4.73 years.

The weighted average grant date fair value of options granted during the first three months of 2017 was $55.70 and this was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:


Volatility	37.5	%
Dividend yield	0	%
Life (in years)	4.6
Risk-free interest rate	1.88	%

Performance Share Units

In February 2017, our executive officers were granted performance share unit (“PSU”) awards with vesting contingent on successful attainment of pre-determined revenue targets over the course of a three-year performance period (fiscal years 2017 – 2019). During the three months ended March 31, 2017, expense of $169,000 was recognized for PSU awards.

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.

Activity for our restricted stock units and PSUs was as follows:


	Restricted Stock Units			Weighted Average Grant Date Fair Value
	(#)			($/share)
Outstanding at December 31, 2016		189,042		$	54.14
Granted		203,680			55.70
Vested and common stock issued		(64,818	)		53.63
Forfeited		(2,052	)		54.00

Outstanding at March 31, 2017		325,852			55.22

The number of restricted stock units outstanding at March 31, 2017 included 4,316 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, 2016		1,524		$	52.28
Restricted common stock issued		—			—
Restrictions lapsed		(1,524	)		52.28
Forfeited		—			—

Outstanding at March 31, 2017		—			—

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, respectively. 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, 2017, we withheld approximately $616,000 from employees participating in the plan as of March 31, 2017.

For the three months ended March 31, 2017, we recorded approximately $138,000 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 the offering period using the Black-Scholes option pricing model with the following assumptions:


Volatility	26.0	%
Dividend yield	0	%
Life (in years)	0.5
Risk-free interest rate	0.62	%

- Definition

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

+ References + Details

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	NOTE F – 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 permanently non-deductible expenses partially offset by the federal research and development credit. Additionally, under ASU 2016-09, excess tax benefits generated upon settlement or exercise of stock awards are now recognized as a reduction to income tax expense as a discrete tax item in the quarter that the event occurs creating potentially significant fluctuation in tax expense by quarter and by year. Our provisions for income taxes included current federal, foreign and state income tax expense, as well as deferred tax expense. As of March 31, 2017 we do not have any unrecognized tax benefits nor any accrued interest or tax penalties.

Net Income Per Share

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Net Income Per Share

NOTE G – Net Income Per Share

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

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


	Three Months Ended March 31,
	2017		2016
Numerator
Net income	$	2,971	$	1,044

Denominator
Weighted average common shares outstanding, basic		17,154		16,783
Options to purchase common stock		199		244
Restricted stock units		40		—
Employee stock purchase plan		—		2

Weighted average common shares outstanding, diluted		17,393		17,029


Net income per share
Basic	$	0.17	$	0.06
Diluted	$	0.17	$	0.06

The effect of approximately 269,000 and 325,000 outstanding potential common shares was excluded from the calculation of diluted net income per share for the three months ended March 31, 2017 and 2016, respectively, as they were anti-dilutive.

General (Policies)	3 Months Ended
General (Policies)	Mar. 31, 2017
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, 2016 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, 2016 included in our Annual Report on Form 10-K as filed with the Securities and Exchange Commission on February 27, 2017.
Use of Estimates	Use of Estimates Preparing financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.
Significant Accounting Policies	Significant Accounting Policies During the three months ended March 31, 2017, 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, 2016, as filed with the Securities and Exchange Commission on February 27, 2017, for additional information regarding our significant accounting policies.
Recently Adopted/Issued Accounting Pronouncements	Recently Adopted Accounting Pronouncements In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). The new guidance requires excess tax benefits and tax deficiencies to be recorded in the income statement when the awards vest or are settled and provides an accounting policy election to account for forfeitures as they occur. In addition, cash flows related to excess tax benefits will no longer be separately classified as a financing activity apart from other income tax cash flows within operating activities. The standard also allows entities to repurchase more of an employee’s shares for tax withholding purposes without triggering liability accounting and clarifies that all cash payments made on an employee’s behalf for withheld shares should be presented as a financing activity on the statements of cash flows. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016, with early adoption permitted. We adopted ASU 2016-09 during the three months ended March 31, 2017. The impact to our consolidated balance sheet as of January 1, 2017 was a $16.3 million increase in deferred income tax assets, non-current and a corresponding $16.3 million decrease in accumulated deficit. This impact results from the cumulative-effect adjustment for previously unrecognized excess tax benefits using the modified retrospective method required by the new standard. We elected to adopt the changes in cash flow statement presentation prospectively to be consistent with the prospective transition for the treatment of excess tax benefits in the income statement. Accordingly, we no longer classify excess tax benefits as a financing activity subsequent to January 1, 2017. Recently Issued Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This guidance will replace most existing revenue recognition guidance in GAAP when it becomes effective. These new requirements are effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods. We do not believe the new revenue recognition standard will materially impact our recognition of the primary fees received from customers for our cloud-based supply chain solutions. We believe the adoption of the new standard could impact our accounting for certain upfront set-up fees and the periods over which the related revenues are recognized, as well as the timing of cost recognition for sales commissions and other contract acquisition costs. We are currently evaluating implementation methods and the extent of the impact that implementation of this standard will have on our consolidated financial statements upon adoption In February 2016, the FASB issued ASU 2016-02, Leases which will supersede the existing lease guidance and will require all leases with a term greater than 12 months to be recognized in the statements of financial position and eliminate current real estate-specific lease guidance, while maintaining substantially similar classification criteria for distinguishing between finance leases and operating leases. This standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. We believe the adoption of the new lease accounting standard will materially impact our consolidated financial statements by increasing our non-current assets and non-current liabilities on our consolidated balance sheets in order to record the right of use assets and related lease liabilities for our existing operating leases. We are in the process of determining the financial statement impact and are currently unable to estimate the impact on our consolidated financial statements.

Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Summary of Investment in Cash Equivalents and Marketable Securities

Cash equivalents and marketable securities, consisted of the following:


	March 31, 2017
	Amortized Cost		Unrealized Gains (Losses)			Fair Value
	(Dollars in thousands)
Cash equivalents:
Money market funds	$	80,310	$	—		$	80,310
Marketable securities:
Corporate bonds		15,681		(120	)		15,561
Commercial paper		4,995		—			4,995
U.S. treasury securities		7,489		8			7,497

	$	108,475	$	(112	)	$	108,363


Due within one year						$	105,860
Due within two years							2,503

Total						$	108,363


	December 31, 2016
	Amortized Cost		Unrealized Gains (Losses)			Fair Value
	(Dollars in thousands)
Cash equivalents:
Money market funds	$	75,375	$	—		$	75,375
Marketable securities:
Corporate bonds		15,681		(96	)		15,585
Commercial paper		4,977		10			4,987
U.S. treasury securities		7,489		10			7,499
U.S. agency obligations		2,497		3			2,500

	$	106,019	$	(73	)	$	105,946


Due within one year						$	98,452
Due within two years							7,494

Total						$	105,946

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


	March 31, 2017
	Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets:
Cash and cash equivalents:
Money market funds	$	80,310	$	—	$	—	$	80,310
Marketable securities:
Corporate bonds		—		15,561		—		15,561
Commerical paper		—		4,995		—		4,995
U.S. treasury securities		—		7,497		—		7,497

Total	$	80,310	$	28,053	$	—	$	108,363


	December 31, 2016
	Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets:
Cash and cash equivalents:
Money market funds	$	75,375	$	—	$	—	$	75,375
Marketable securities:
Corporate bonds		—		15,585		—		15,585
Commerical paper		—		4,987		—		4,987
U.S. treasury securities		—		7,499		—		7,499
U.S. agency obligations		—		2,500		—		2,500

Total	$	75,375	$	30,571	$	—	$	105,946

- 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)

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

Changes in the carrying amount of goodwill for the three months ended March 31, 2017 and 2016 are as follows:


	2017
	(Dollars in thousands)
Balances, January 1	$	49,777
Goodwill acquired during the period		—
Foreign currency translation adjustments		512

Balances, March 31	$	50,289

Intangible Assets Subject to Amortization


	March 31, 2017
	Carrying Amount		Accumulated Amortization			Foreign Currency Translation		Net
	(Dollars in thousands)
Subscriber relationships	$	34,350	$	(16,633	)	$	187	$	17,904
Non-competition agreements		2,499		(1,910	)		17		606
Technology and other		2,131		(1,264	)		12		879

	$	38,980	$	(19,807	)	$	216	$	19,389


	December 31, 2016
	Carrying Amount		Accumulated Amortization			Foreign Currency Translation		Net
	(Dollars in thousands)
Subscriber relationships	$	33,736	$	(15,708	)	$	295	$	18,323
Non-competition agreements		2,234		(1,818	)		17		433
Technology and other		2,089		(1,120	)		63		1,032

	$	38,059	$	(18,646	)	$	375	$	19,788

Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization

The estimated annual amortization expense related to intangible assets subject to amortization for the next five years is as follows:


	(Dollars in thousands)
Remainder of 2017	$	3,322
2018		3,927
2019		3,636
2020		3,290
2021		2,453
Thereafter		2,761

	$	19,389

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Payments Under Operating Leases

At March 31, 2017, our future minimum payments under operating leases were as follows:


	(Dollars in thousands)
Remainder of 2017	$	2,438
2018		3,128
2019		3,217
2020		1,814
2021		1,035
Thereafter		1,174

	$	12,806

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

Stock-Based Compensation Expense

This expense was allocated as follows:


	Three Months Ended March 31,
	2017		2016
	(Dollars in thousands)
Cost of revenues	$	451	$	280
Operating expenses
Sales and marketing		517		654
Research and development		229		138
General and administrative		1,103		855

Total stock-based compensation expense	$	2,300	$	1,927

Stock Option Activity

Our stock option activity was as follows:


	Options			Weighted Average Exercise Price
	(#)			($/share)
Outstanding at December 31, 2016		1,016,012		$	44.72
Granted		147,848			55.70
Exercised		(54,564	)		18.99
Forfeited		(5,267	)		54.03

Outstanding at March 31, 2017		1,104,029			47.42

Weighted Average Grant Date Fair Value of Options Granted, Assumptions


Volatility	37.5	%
Dividend yield	0	%
Life (in years)	4.6
Risk-free interest rate	1.88	%

Fair Value Estimation of Common Stock Using Black-Scholes Option Pricing Model, Assumptions

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


Volatility	26.0	%
Dividend yield	0	%
Life (in years)	0.5
Risk-free interest rate	0.62	%

Restricted Stock Units and Performance Share Units [Member]

Restricted Stock Units, Restricted Stock Awards and PSUs

Activity for our restricted stock units and PSUs was as follows:


	Restricted Stock Units			Weighted Average Grant Date Fair Value
	(#)			($/share)
Outstanding at December 31, 2016		189,042		$	54.14
Granted		203,680			55.70
Vested and common stock issued		(64,818	)		53.63
Forfeited		(2,052	)		54.00

Outstanding at March 31, 2017		325,852			55.22

Restricted Stock Award [Member]

Restricted Stock Units, Restricted Stock Awards and PSUs

Our restricted stock awards activity was as follows:


	Restricted Stock Awards			Weighted Average Grant Date Fair Value
	(#)			($/share)
Outstanding at December 31, 2016		1,524		$	52.28
Restricted common stock issued		—			—
Restrictions lapsed		(1,524	)		52.28
Forfeited		—			—

Outstanding at March 31, 2017		—			—

Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Components of Computation of Basic and Diluted Net Income Per Share

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


	Three Months Ended March 31,
	2017		2016
Numerator
Net income	$	2,971	$	1,044

Denominator
Weighted average common shares outstanding, basic		17,154		16,783
Options to purchase common stock		199		244
Restricted stock units		40		—
Employee stock purchase plan		—		2

Weighted average common shares outstanding, diluted		17,393		17,029


Net income per share
Basic	$	0.17	$	0.06
Diluted	$	0.17	$	0.06

General - Additional Information (Detail) - ASU 2016-09 [Member] $ in Millions	Mar. 31, 2017 USD ($)
Deferred Income Tax Assets, Non-Current [Member]
Schedule Of Accounting Policies [Line Items]
Cumulative effect of change due to new accounting pronouncement	$ 16.3
Accumulated Deficit [Member]
Schedule Of Accounting Policies [Line Items]
Cumulative effect of change due to new accounting pronouncement	$ 16.3

- Definition

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References + Details

Financial Instruments - Summary of Investment in Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Cash Equivalents and Marketable Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Due within one year	$ 105,860	$ 98,452
Amortized Cost	108,475	106,019
Due within two years	2,503	7,494
Unrealized Gains (Losses)	(112)	(73)
Fair Value	108,363	105,946
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	80,310	75,375
Fair Value	80,310	75,375
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,681	15,681
Unrealized Gains (Losses)	(120)	(96)
Fair Value	15,561	15,585
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,995	4,977
Unrealized Gains (Losses)		10
Fair Value	4,995	4,987
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,489	7,489
Unrealized Gains (Losses)	8	10
Fair Value	$ 7,497	7,499
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,497
Unrealized Gains (Losses)		3
Fair Value		$ 2,500

Financial Instruments - Additional Information (Detail)	Mar. 31, 2017 USD ($)
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized Losses	$ 0

Financial Instruments - Summary of Financial Assets Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	$ 108,363	$ 105,946
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	80,310	75,375
Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	15,561	15,585
Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	4,995	4,987
U.S. Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	7,497	7,499
U.S. Agency Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value		2,500
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	80,310	75,375
Level 1 [Member] \| Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	80,310	75,375
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	28,053	30,571
Level 2 [Member] \| Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	15,561	15,585
Level 2 [Member] \| Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	4,995	4,987
Level 2 [Member] \| U.S. Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	$ 7,497	7,499
Level 2 [Member] \| U.S. Agency Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value		$ 2,500

Goodwill and Intangible Assets, net - Schedule of Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Balances, January 1	$ 49,777
Goodwill acquired during the period	0
Foreign currency translation adjustments	512
Balances, March 31	$ 50,289

Goodwill and Intangible Assets, net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 1,215	$ 1,161
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets useful life	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets useful life	9 years

Goodwill and Intangible Assets, net - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	$ 38,980	$ 38,059
Accumulated Amortization	(19,807)	(18,646)
Foreign Currency Translation	216	375
Net	19,389	19,788
Subscriber Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	34,350	33,736
Accumulated Amortization	(16,633)	(15,708)
Foreign Currency Translation	187	295
Net	17,904	18,323
Non-competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	2,499	2,234
Accumulated Amortization	(1,910)	(1,818)
Foreign Currency Translation	17	17
Net	606	433
Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	2,131	2,089
Accumulated Amortization	(1,264)	(1,120)
Foreign Currency Translation	12	63
Net	$ 879	$ 1,032

Goodwill and Intangible Assets, net - Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2017	$ 3,322
2018	3,927
2019	3,636
2020	3,290
2021	2,453
Thereafter	2,761
Net	$ 19,389	$ 19,788

Commitments and Contingencies - Future Minimum Payments Under Operating Leases (Detail) $ in Thousands	Mar. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2017	$ 2,438
2018	3,128
2019	3,217
2020	1,814
2021	1,035
Thereafter	1,174
Operating leases, total	$ 12,806

Stock-Based Compensation - Additional Information (Detail)	1 Months Ended	3 Months Ended
	Feb. 28, 2017 shares	Mar. 31, 2017 USD ($) OfferingPeriods $ / shares shares	Mar. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant \| shares		4,500,000
Stock-based compensation expense \| $		$ 2,300,000	$ 1,927,000
Unrecognized stock-based compensation expense \| $		$ 23,400,000
Unrecognized stock-based compensation, expected to be recognized, weighted average period		3 years
Stock options vest, period		4 years
Stock options contractual term, from the date of grant		Seven to ten years
Stock options exercisable \| shares		630,995
Weighted average exercise price \| $ / shares		$ 42.11
Weighted average remaining contractual life		4 years 8 months 23 days
Weighted average fair value per share of options granted \| $ / shares		$ 55.70
Number of RSU's vested and not issued during the period \| shares		4,316
Percentage of common stock on fair market value		85.00%
Number of offerings per year \| OfferingPeriods		2
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 138,000
Common stock reserved for future issuance \| shares		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	1,024,868
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan, employees contribution \| $		$ 616,000
Performance Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 169,000
Stock options vest, period	3 years
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
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 2,300	$ 1,927
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	451	280
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	517	654
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	229	138
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 1,103	$ 855

Stock-Based Compensation - Stock Option Activity (Detail)	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options Outstanding, Beginning balance \| shares	1,016,012
Options, Granted \| shares	147,848
Options, Exercised \| shares	(54,564)
Options, Forfeited \| shares	(5,267)
Options Outstanding, Ending balance \| shares	1,104,029
Weighted Average Exercise Price, Outstanding, Beginning Balance \| $ / shares	$ 44.72
Weighted Average Exercise Price, Granted \| $ / shares	55.70
Weighted Average Exercise Price, Exercised \| $ / shares	18.99
Weighted Average Exercise Price, Forfeited \| $ / shares	54.03
Weighted Average Exercise Price, Outstanding, Ending Balance \| $ / shares	$ 47.42

Stock-Based Compensation - Weighted Average Grant Date Fair Value of Options Granted, Assumptions (Detail) - Stock Options [Member]	3 Months Ended
	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	37.50%
Dividend yield	0.00%
Life (in years)	4 years 7 months 6 days
Risk-free interest rate	1.88%

Stock-Based Compensation - Restricted Stock Units and PSUs (Detail) - Restricted Stock Units and Performance Share Units [Member]	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding, Beginning Balance \| shares	189,042
Granted, stock units \| shares	203,680
Vested, stock units \| shares	(64,818)
Forfeited, stock units \| shares	(2,052)
Stock awards, Outstanding, Ending Balance \| shares	325,852
Weighted average grant date fair value, Outstanding, Beginning Balance \| $ / shares	$ 54.14
Granted, Weighted Average Grant Date Fair Value \| $ / shares	55.70
Vested, Weighted Average Grant Date Fair Value \| $ / shares	53.63
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	54.00
Weighted average grant date fair value, Outstanding, Ending Balance \| $ / shares	$ 55.22

Stock-Based Compensation - Restricted Stock Awards (Detail) - Restricted Stock Award [Member]	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding, Beginning Balance \| shares	1,524
Restricted common stock issued, stock awards \| shares	0
Restrictions lapsed, stock awards \| shares	(1,524)
Forfeited, stock awards \| shares	0
Weighted average grant date fair value, Outstanding, Beginning Balance \| $ / shares	$ 52.28
Restricted common stock issued, Weighted Average Grant Date Fair Value \| $ / shares	0
Restrictions lapsed, Weighted Average Grant Date Fair Value \| $ / shares	52.28
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	$ 0

Stock-Based Compensation - Fair Value Estimation of Common Stock Using Black-Scholes Option Pricing Model, Assumptions (Detail) - Employee Stock Purchase Plan [Member]	3 Months Ended
	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	26.00%
Dividend yield	0.00%
Life (in years)	6 months
Risk-free interest rate	0.62%

Income Taxes - Additional Information (Detail)	Mar. 31, 2017 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
	Mar. 31, 2017	Mar. 31, 2016
Numerator
Net income	$ 2,971	$ 1,044
Denominator
Weighted average common shares outstanding, basic	17,154	16,783
Options to purchase common stock	199	244
Restricted stock units	40
Employee stock purchase plan		2
Weighted average common shares outstanding, diluted	17,393	17,029
Net income per share
Basic	$ 0.17	$ 0.06
Diluted	$ 0.17	$ 0.06

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Outstanding potential common shares excluded from computation of net income per share	269,000	325,000