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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2017	Jul. 24, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
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		17,221,797

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 131,744	$ 115,877
Short-term marketable securities	26,896	23,076
Accounts receivable, less allowance for doubtful accounts of $790 and $515, respectively	21,545	20,746
Deferred costs	21,917	19,224
Other current assets	6,955	7,010
Total current assets	209,057	185,933
PROPERTY AND EQUIPMENT, net	15,527	15,314
GOODWILL	50,766	49,777
INTANGIBLE ASSETS, net	18,484	19,788
MARKETABLE SECURITIES, non-current	4,997	7,494
OTHER ASSETS
Deferred costs, non-current	6,419	6,086
Deferred income tax asset, non-current	27,524	12,446
Other non-current assets	1,098	1,527
Total assets	333,872	298,365
CURRENT LIABILITIES
Accounts payable	2,720	2,302
Accrued compensation	13,243	13,740
Accrued expenses	3,723	3,508
Deferred revenue	16,624	11,055
Deferred rent	1,606	1,556
Total current liabilities	37,916	32,161
OTHER LIABILITIES
Deferred revenue, non-current	11,050	10,847
Deferred rent, non-current	3,899	4,179
Deferred income tax liability, non-current	1,977	1,911
Total liabilities	54,842	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; 17,221,798 and 17,081,145 shares issued and outstanding, respectively	17	17
Additional paid-in capital	292,533	286,315
Accumulated deficit	(12,665)	(33,739)
Accumulated other comprehensive loss	(855)	(3,326)
Total stockholders' equity	279,030	249,267
Total liabilities and stockholders' equity	$ 333,872	$ 298,365

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 790	$ 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	17,221,798	17,081,145
Common stock, shares outstanding	17,221,798	17,081,145

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenues	$ 54,284	$ 47,351	$ 106,216	$ 92,950
Cost of revenues	18,191	15,972	35,521	30,853
Gross profit	36,093	31,379	70,695	62,097
Operating expenses
Sales and marketing	18,741	16,677	35,820	32,566
Research and development	5,369	5,542	10,474	10,611
General and administrative	8,139	7,082	15,966	14,367
Amortization of intangible assets	1,117	1,198	2,332	2,359
Total operating expenses	33,366	30,499	64,592	59,903
Income from operations	2,727	880	6,103	2,194
Other income (expense)
Interest income, net	242	151	433	296
Other income (expense), net	(102)	(374)	(162)	(81)
Total other income (expense), net	140	(223)	271	215
Income before income taxes	2,867	657	6,374	2,409
Income tax expense	(1,042)	(305)	(1,578)	(1,013)
Net income	$ 1,825	$ 352	$ 4,796	$ 1,396
Net income per share
Basic	$ 0.11	$ 0.02	$ 0.28	$ 0.08
Diluted	$ 0.11	$ 0.02	$ 0.28	$ 0.08
Weighted average common shares used to compute net income per share
Basic	17,198	16,909	17,176	16,873
Diluted	17,378	17,120	17,384	17,100
Other comprehensive income (loss)
Foreign currency translation adjustments	$ 935	$ (856)	$ 2,512	$ 1,965
Unrealized gain on investments (net of tax of ($5), $15, ($10) and $61)	(9)	24	(17)	99
Reclassification of gain on investments into earnings (net of tax of ($5), $0, ($15) and $0)	(8)		(24)
Comprehensive income (loss)	$ 2,743	$ (480)	$ 7,267	$ 3,460

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Tax on net unrealized gain (losses) on investment securities available for sale	$ (5)	$ 15	$ (10)	$ 61
Reclassification of gain on investments into earnings, tax	$ (5)	$ 0	$ (15)	$ 0

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income	$ 4,796	$ 1,396
Reconciliation of net income to net cash provided by operating activities
Deferred income taxes	1,236	(439)
Share-based earn-out liability		(72)
Depreciation and amortization of property and equipment	3,431	3,259
Amortization of intangible assets	2,332	2,359
Provision for doubtful accounts	873	592
Stock-based compensation	4,486	3,992
Other, net	9
Changes in assets and liabilities
Accounts receivable	(1,607)	(2,495)
Deferred costs	(3,025)	(2,592)
Other current and non-current assets	(3)	(3,138)
Accounts payable	195	719
Accrued compensation	(546)	439
Accrued expenses	206	464
Deferred revenue	5,772	4,325
Deferred rent	(249)	(17)
Net cash provided by operating activities	17,906	8,792
Cash flows from investing activities
Purchases of property and equipment	(3,334)	(3,070)
Purchases of marketable securities	(22,350)	(8,499)
Maturities of marketable securities	21,000	2,500
Acquisitions of businesses and intangible assets, net of cash acquired	(500)	(18,062)
Net cash used in investing activities	(5,184)	(27,131)
Cash flows from financing activities
Net proceeds from exercise of options to purchase common stock	1,244	1,749
Excess tax benefits from exercise of options to purchase common stock		1,421
Net proceeds from employee stock purchase plan	1,011	786
Net cash provided by financing activities	2,255	3,956
Effect of foreign currency exchange rate changes	890	5
Net increase (decrease) in cash and cash equivalents	15,867	(14,378)
Cash and cash equivalents at beginning of period	115,877	121,538
Cash and cash equivalents at end of period	$ 131,744	$ 107,160

General	6 Months Ended
General	Jun. 30, 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 fulfillment, sourcing, and item assortment management solutions, along with 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 logistics firms orchestrate the sourcing, set up of new vendors and items, and fulfillment of the products that customers buy from retailers and suppliers. 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 provide a fair presentation 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 six months ended June 30, 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 six months ended June 30, 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. Recent 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 will 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 some sales commissions. These impacts will not be material to our financial statements. We are currently finalizing our evaluation of implementation methods and the extent of the impact that implementation of this standard will have on our financial statement disclosures 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

6 Months Ended

Jun. 30, 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:


	June 30, 2017
	Amortized		Unrealized			Fair
	Cost		Gains (Losses)			Value
	(Dollars in thousands)
Cash equivalents:
Money market funds	$	80,158	$	—		$	80,158
Marketable securities:
Corporate bonds		14,677		(134	)		14,543
Commercial paper		4,975		—			4,975
U.S. treasury securities		12,380		(5	)		12,375

	$	112,190	$	(139	)	$	112,051

Due within one year						$	107,054
Due within two years							4,997

Total						$	112,051


	December 31, 2016
	Amortized		Unrealized			Fair
	Cost		Gains (Losses)			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 June 30, 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 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:


	June 30, 2017
	Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets:
Cash and cash equivalents:
Money market funds	$	80,158	$	—	$	—	$	80,158
Marketable securities:
Corporate bonds		—		14,543		—		14,543
Commercial paper		—		4,975		—		4,975
U.S. treasury securities		—		12,375		—		12,375

Total	$	80,158	$	31,893	$	—	$	112,051


	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
Commercial 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.

Goodwill and Intangible Assets, net

6 Months Ended

Jun. 30, 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 six months ended June 30, 2017 are as follows:


	2017
	(Dollars in thousands)
Balances, January 1	$	49,777
Goodwill acquired during the period		—
Foreign currency translation adjustments		989

Balances, June 30	$	50,766

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


	June 30, 2017
	Carrying Amount		Accumulated Amortization			Foreign Currency Translation		Net
	(Dollars in thousands)
Subscriber relationships	$	34,350	$	(17,606	)	$	366	$	17,110
Non-competition agreements		2,499		(1,965	)		29		563
Technology and other		2,130		(1,352	)		33		811

	$	38,979	$	(20,923	)	$	428	$	18,484


	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

Total amortization expense for intangible assets during the three months ended June 30, 2017 and 2016 was $1.1 million and $1.2 million, respectively. Total amortization expense for intangible assets during the six months ended June 30, 2017 and 2016 was $2.3 million and $2.4 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	$	2,221
2018		3,968
2019		3,676
2020		3,321
2021		2,481
Thereafter		2,817

	$	18,484

- 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

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE D – Commitments and Contingencies

Operating Leases

At June 30, 2017, our future minimum payments under operating leases were as follows:


	(Dollars in thousands)
Remainder of 2017	$	1,688
2018		3,353
2019		3,443
2020		1,893
2021		1,040
Thereafter		1,174

	$	12,591

Stock-Based Compensation

6 Months Ended

Jun. 30, 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 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 February 2017, 1,024,868 additional shares were reserved for future issuance under our 2010 Equity Incentive Plan. At June 30, 2017, there were approximately 4.5 million shares available for grant under approved equity compensation plans.

We recorded stock-based compensation expense of $2.2 million and $4.5 million for the three and six months ended June 30, 2017 and $2.1 million and $4.0 million for the three and six months ended June 30, 2016, respectively. This expense was allocated in the consolidated statements of comprehensive income (loss) as follows (in thousands):


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Cost of revenues	$	469	$	317	$	920	$	597
Operating expenses
Sales and marketing		574		639		1,091		1,293
Research and development		228		141		457		279
General and administrative		915		968		2,018		1,823

Total stock-based compensation expense	$	2,186	$	2,065	$	4,486	$	3,992

As of June 30, 2017, there was approximately $22.0 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 2.8 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		167,903			56.00
Exercised		(60,592	)		20.52
Forfeited		(8,417	)		56.28

Outstanding at June 30, 2017		1,114,906			47.65

Of the total outstanding options at June 30, 2017, 671,876 were exercisable with a weighted average exercise price of $43.11 per share. The total outstanding options had a weighted average remaining contractual life of 4.53 years.

The weighted average grant date fair value of options granted during the first six months of 2017 was $18.90 and this was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:


Volatility	37.4	%
Dividend yield	0	%
Life (in years)	4.5
Risk-free interest rate	1.85	%

Performance Share Units and Restricted Stock Units and Awards

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, we recognized expense of $169,000 for PSU awards; and during the three months ended June 30, 2017 we recognized a reversing benefit of $169,000 as the probability of attainment was decreased.

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 performance share units and restricted stock units was as follows:


	Performance Share and Restricted Stock Units			Weighted Average Grant Date Fair Value
	(#)			($/share)
Outstanding at December 31, 2016		189,042		$	54.14
Granted		206,043			55.72
Vested and common stock issued		(64,818	)		53.63
Forfeited		(3,317	)		54.67

Outstanding at June 30, 2017		326,950			55.23

The number of restricted stock units outstanding at June 30, 2017 included 18,448 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		5,454			58.29
Restrictions lapsed		(2,886	)		55.11
Forfeited		—			—

Outstanding at June 30, 2017		4,092			58.29

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 1.0 million shares of common stock are reserved for issuance under the plan.

For the offering period that began on January 1, 2017 and ended on June 30, 2017, we withheld approximately $1,021,000 from employees participating in the plan. On June 30, 2017, approximately $1,011,000 of these funds were used to purchase 18,655 shares on behalf of the employees participating in the plan. The remaining funds are expected to be refunded to employees pursuant to the requirements of the plan.

For the three and six months ended June 30, 2017, we recorded approximately $154,000 and $292,000, 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 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	%

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 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, 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 include current foreign and state income tax expense, as well as deferred tax expense. As of June 30, 2017 we do not have any unrecognized tax benefits nor any accrued interest or tax penalties.

Net Income Per Share

6 Months Ended

Jun. 30, 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				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Net income	$	1,825	$	352	$	4,796	$	1,396

Net income per share
Basic	$	0.11	$	0.02	$	0.28	$	0.08
Diluted	$	0.11	$	0.02	$	0.28	$	0.08
Weighted average common shares outstanding, basic		17,198		16,909		17,176		16,873
Options to purchase common stock		152		209		177		226
Restricted stock units		28		2		31		1

Weighted average common shares outstanding, diluted		17,378		17,120		17,384		17,100

Antidilutive shares		267,000		315,000		267,000		339,000

General (Policies)	6 Months Ended
General (Policies)	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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 provide a fair presentation 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 six months ended June 30, 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/Recent 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 six months ended June 30, 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. Recent 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 will 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 some sales commissions. These impacts will not be material to our financial statements. We are currently finalizing our evaluation of implementation methods and the extent of the impact that implementation of this standard will have on our financial statement disclosures 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)

6 Months Ended

Jun. 30, 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:


	June 30, 2017
	Amortized		Unrealized			Fair
	Cost		Gains (Losses)			Value
	(Dollars in thousands)
Cash equivalents:
Money market funds	$	80,158	$	—		$	80,158
Marketable securities:
Corporate bonds		14,677		(134	)		14,543
Commercial paper		4,975		—			4,975
U.S. treasury securities		12,380		(5	)		12,375

	$	112,190	$	(139	)	$	112,051

Due within one year						$	107,054
Due within two years							4,997

Total						$	112,051


	December 31, 2016
	Amortized		Unrealized			Fair
	Cost		Gains (Losses)			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


	June 30, 2017
	Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Assets:
Cash and cash equivalents:
Money market funds	$	80,158	$	—	$	—	$	80,158
Marketable securities:
Corporate bonds		—		14,543		—		14,543
Commercial paper		—		4,975		—		4,975
U.S. treasury securities		—		12,375		—		12,375

Total	$	80,158	$	31,893	$	—	$	112,051


	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
Commercial 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)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

Changes in the carrying amount of goodwill for the six months ended June 30, 2017 are as follows:


	2017
	(Dollars in thousands)
Balances, January 1	$	49,777
Goodwill acquired during the period		—
Foreign currency translation adjustments		989

Balances, June 30	$	50,766

Intangible Assets Subject to Amortization


	June 30, 2017
	Carrying Amount		Accumulated Amortization			Foreign Currency Translation		Net
	(Dollars in thousands)
Subscriber relationships	$	34,350	$	(17,606	)	$	366	$	17,110
Non-competition agreements		2,499		(1,965	)		29		563
Technology and other		2,130		(1,352	)		33		811

	$	38,979	$	(20,923	)	$	428	$	18,484


	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	$	2,221
2018		3,968
2019		3,676
2020		3,321
2021		2,481
Thereafter		2,817

	$	18,484

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Payments Under Operating Leases

At June 30, 2017, our future minimum payments under operating leases were as follows:


	(Dollars in thousands)
Remainder of 2017	$	1,688
2018		3,353
2019		3,443
2020		1,893
2021		1,040
Thereafter		1,174

	$	12,591

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

Stock-Based Compensation Expense

This expense was allocated in the consolidated statements of comprehensive income (loss) as follows (in thousands):


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Cost of revenues	$	469	$	317	$	920	$	597
Operating expenses
Sales and marketing		574		639		1,091		1,293
Research and development		228		141		457		279
General and administrative		915		968		2,018		1,823

Total stock-based compensation expense	$	2,186	$	2,065	$	4,486	$	3,992

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		167,903			56.00
Exercised		(60,592	)		20.52
Forfeited		(8,417	)		56.28

Outstanding at June 30, 2017		1,114,906			47.65

Weighted Average Grant Date Fair Value of Options Granted, Assumptions


Volatility	37.4	%
Dividend yield	0	%
Life (in years)	4.5
Risk-free interest rate	1.85	%

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	%

Performance Share Units and Restricted Stock Units [Member]

Performance Share Units and Restricted Stock Units and Restricted Stock Awards

Activity for our performance share units and restricted stock units was as follows:


	Performance Share and Restricted Stock Units			Weighted Average Grant Date Fair Value
	(#)			($/share)
Outstanding at December 31, 2016		189,042		$	54.14
Granted		206,043			55.72
Vested and common stock issued		(64,818	)		53.63
Forfeited		(3,317	)		54.67

Outstanding at June 30, 2017		326,950			55.23

Restricted Stock Award [Member]

Performance Share Units and 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, 2016		1,524		$	52.28
Restricted common stock issued		5,454			58.29
Restrictions lapsed		(2,886	)		55.11
Forfeited		—			—

Outstanding at June 30, 2017		4,092			58.29

Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 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				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Net income	$	1,825	$	352	$	4,796	$	1,396

Net income per share
Basic	$	0.11	$	0.02	$	0.28	$	0.08
Diluted	$	0.11	$	0.02	$	0.28	$	0.08
Weighted average common shares outstanding, basic		17,198		16,909		17,176		16,873
Options to purchase common stock		152		209		177		226
Restricted stock units		28		2		31		1

Weighted average common shares outstanding, diluted		17,378		17,120		17,384		17,100

Antidilutive shares		267,000		315,000		267,000		339,000

General - Additional Information (Detail) - ASU 2016-09 [Member] $ in Millions	Jun. 30, 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

Financial Instruments - Summary of Investment in Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Cash Equivalents and Marketable Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Due within one year	$ 107,054	$ 98,452
Amortized Cost	112,190	106,019
Due within two years	4,997	7,494
Unrealized Gains (Losses)	(139)	(73)
Fair Value	112,051	105,946
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	80,158	75,375
Fair Value	80,158	75,375
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,677	15,681
Unrealized Gains (Losses)	(134)	(96)
Fair Value	14,543	15,585
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,975	4,977
Unrealized Gains (Losses)		10
Fair Value	4,975	4,987
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,380	7,489
Unrealized Gains (Losses)	(5)	10
Fair Value	$ 12,375	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)	Jun. 30, 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	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	$ 112,051	$ 105,946
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	80,158	75,375
Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	14,543	15,585
Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	4,975	4,987
U.S. Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	12,375	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	80,158	75,375
Level 1 [Member] \| Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	80,158	75,375
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	31,893	30,571
Level 2 [Member] \| Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	14,543	15,585
Level 2 [Member] \| Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	4,975	4,987
Level 2 [Member] \| U.S. Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	$ 12,375	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	6 Months Ended
	Jun. 30, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Balances, January 1	$ 49,777
Goodwill acquired during the period	0
Foreign currency translation adjustments	989
Balances, June 30	$ 50,766

Goodwill and Intangible Assets, net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 1,117	$ 1,198	$ 2,332	$ 2,359
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	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	$ 38,979	$ 38,059
Accumulated Amortization	(20,923)	(18,646)
Foreign Currency Translation	428	375
Net	18,484	19,788
Subscriber Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	34,350	33,736
Accumulated Amortization	(17,606)	(15,708)
Foreign Currency Translation	366	295
Net	17,110	18,323
Non-competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	2,499	2,234
Accumulated Amortization	(1,965)	(1,818)
Foreign Currency Translation	29	17
Net	563	433
Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	2,130	2,089
Accumulated Amortization	(1,352)	(1,120)
Foreign Currency Translation	33	63
Net	$ 811	$ 1,032

Goodwill and Intangible Assets, net - Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2017	$ 2,221
2018	3,968
2019	3,676
2020	3,321
2021	2,481
Thereafter	2,817
Net	$ 18,484	$ 19,788

Commitments and Contingencies - Future Minimum Payments Under Operating Leases (Detail) $ in Thousands	Jun. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2017	$ 1,688
2018	3,353
2019	3,443
2020	1,893
2021	1,040
Thereafter	1,174
Operating leases, total	$ 12,591

Stock-Based Compensation - Additional Information (Detail)		1 Months Ended	3 Months Ended			6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares	Feb. 28, 2017 shares	Jun. 30, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) OfferingPeriods $ / shares shares	Jun. 30, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant \| shares	4,500,000		4,500,000			4,500,000
Stock-based compensation expense			$ 2,186,000		$ 2,065,000	$ 4,486,000	$ 3,992,000
Unrecognized stock-based compensation expense	$ 22,000,000		$ 22,000,000			$ 22,000,000
Unrecognized stock-based compensation, expected to be recognized, weighted average period						2 years 9 months 18 days
Stock options vest, period						4 years
Stock options contractual term, from the date of grant						Seven to ten years
Stock options exercisable \| shares	671,876		671,876			671,876
Weighted average exercise price \| $ / shares	$ 43.11		$ 43.11			$ 43.11
Weighted average remaining contractual life						4 years 6 months 10 days
Weighted average fair value per share of options granted \| $ / shares						$ 18.90
Number of RSU's vested and not issued during the period \| shares						18,448
Percentage of common stock on fair market value						85.00%
Number of offerings per year \| OfferingPeriods						2
Net proceeds from employee stock purchase plan						$ 1,011,000	$ 786,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 154,000			$ 292,000
Common stock reserved for future issuance \| shares	1,000,000		1,000,000			1,000,000
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	$ 1,021,000		$ 1,021,000			$ 1,021,000
Employee stock purchase plan, shares purchased \| shares	18,655
Net proceeds from employee stock purchase plan	$ 1,011,000
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
Stock-based compensation reversing benefit			$ 169,000
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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 2,186	$ 2,065	$ 4,486	$ 3,992
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	469	317	920	597
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	574	639	1,091	1,293
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	228	141	457	279
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 915	$ 968	$ 2,018	$ 1,823

Stock-Based Compensation - Stock Option Activity (Detail)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options Outstanding, Beginning balance \| shares	1,016,012
Options, Granted \| shares	167,903
Options, Exercised \| shares	(60,592)
Options, Forfeited \| shares	(8,417)
Options Outstanding, Ending balance \| shares	1,114,906
Weighted Average Exercise Price, Outstanding, Beginning Balance \| $ / shares	$ 44.72
Weighted Average Exercise Price, Granted \| $ / shares	56.00
Weighted Average Exercise Price, Exercised \| $ / shares	20.52
Weighted Average Exercise Price, Forfeited \| $ / shares	56.28
Weighted Average Exercise Price, Outstanding, Ending Balance \| $ / shares	$ 47.65

Stock-Based Compensation - Weighted Average Grant Date Fair Value of Options Granted, Assumptions (Detail) - Stock Options [Member]	6 Months Ended
	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	37.40%
Dividend yield	0.00%
Life (in years)	4 years 6 months
Risk-free interest rate	1.85%

Stock-Based Compensation - Performance Share Units and Restricted Stock Units (Detail) - Performance Share Units and Restricted Stock Units [Member]	6 Months Ended
	Jun. 30, 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	206,043
Vested, stock units \| shares	(64,818)
Forfeited, stock units \| shares	(3,317)
Stock awards, Outstanding, Ending Balance \| shares	326,950
Weighted average grant date fair value, Outstanding, Beginning Balance \| $ / shares	$ 54.14
Granted, Weighted Average Grant Date Fair Value \| $ / shares	55.72
Vested, Weighted Average Grant Date Fair Value \| $ / shares	53.63
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	54.67
Weighted average grant date fair value, Outstanding, Ending Balance \| $ / shares	$ 55.23

Stock-Based Compensation - Restricted Stock Awards (Detail) - Restricted Stock Award [Member]	6 Months Ended
	Jun. 30, 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	5,454
Restrictions lapsed, stock awards \| shares	(2,886)
Forfeited, stock awards \| shares	0
Stock awards, Outstanding, Ending Balance \| shares	4,092
Weighted average grant date fair value, Outstanding, Beginning Balance \| $ / shares	$ 52.28
Restricted common stock issued, Weighted Average Grant Date Fair Value \| $ / shares	58.29
Restrictions lapsed, Weighted Average Grant Date Fair Value \| $ / shares	55.11
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	0
Weighted average grant date fair value, Outstanding, Ending Balance \| $ / shares	$ 58.29

Stock-Based Compensation - Fair Value Estimation of Common Stock Using Black-Scholes Option Pricing Model, Assumptions (Detail) - Employee Stock Purchase Plan [Member]	6 Months Ended
	Jun. 30, 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)	Jun. 30, 2017 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 0
Accrued interest or tax penalties	$ 0

Net Income Per Share - Components of Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 1,825	$ 352	$ 4,796	$ 1,396
Net income per share
Basic	$ 0.11	$ 0.02	$ 0.28	$ 0.08
Diluted	$ 0.11	$ 0.02	$ 0.28	$ 0.08
Weighted average common shares outstanding, basic	17,198,000	16,909,000	17,176,000	16,873,000
Options to purchase common stock	152,000	209,000	177,000	226,000
Restricted stock units	28,000	2,000	31,000	1,000
Weighted average common shares outstanding, diluted	17,378,000	17,120,000	17,384,000	17,100,000
Antidilutive shares	267,000,000	315,000,000	267,000,000	339,000,000