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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2019	Jul. 19, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
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 Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		17,441,603
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-34702
Entity Tax Identification Number	412015127
Entity Address, Address Line One	333 South Seventh Street
Entity Address, Address Line Two	Suite 1000
Entity Address, City or Town	Minneapolis
Entity Address, State or Province	MN
Entity Address, Postal Zip Code	55402
City Area Code	612
Local Phone Number	435-9400

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
CURRENT ASSETS
Cash and cash equivalents	$ 147,023	$ 133,859
Short-term investments	51,651	44,537
Accounts receivable, less allowance for doubtful accounts of $1,435 and $1,392, respectively	30,747	27,488
Deferred costs	35,087	34,502
Other current assets	8,265	9,229
Total current assets	272,773	249,615
PROPERTY AND EQUIPMENT, less accumulated depreciation of $46,412 and $41,175, respectively	20,597	20,957
OPERATING LEASE RIGHT-OF-USE ASSETS	14,038
GOODWILL	70,300	69,658
INTANGIBLE ASSETS, net	20,379	22,741
OTHER ASSETS
Deferred costs	10,441	10,973
Deferred income tax asset	7,627	10,456
Other assets	2,452	1,723
Total assets	418,607	386,123
CURRENT LIABILITIES
Accounts payable	3,708	4,440
Accrued compensation	15,883	20,415
Accrued expenses	4,964	4,558
Deferred revenue	30,376	25,328
Deferred rent		1,781
Operating lease liabilities	3,469
Total current liabilities	58,400	56,522
OTHER LIABILITIES
Deferred revenue	2,714	2,512
Deferred rent		5,371
Operating lease liabilities	16,890
Deferred income tax liability	1,246	1,376
Other non-current liabilities	1,024	1,368
Total liabilities	80,274	67,149
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; 17,971,845 and 17,757,628 shares issued; and 17,468,106 and 17,345,736 outstanding, respectively	18	18
Treasury stock, at cost; 503,739 and 411,892 shares, respectively	(34,645)	(25,679)
Additional paid-in capital	344,250	332,592
Retained earnings	30,870	15,261
Accumulated other comprehensive loss	(2,160)	(3,218)
Total stockholders’ equity	338,333	318,974
Total liabilities and stockholders’ equity	$ 418,607	$ 386,123

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,435	$ 1,392
Accumulated depreciation	$ 46,412	$ 41,175
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	17,971,845	17,757,628
Common stock, shares outstanding	17,468,106	17,345,736
Treasury stock, shares	503,739	411,892

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues	$ 68,529	$ 61,091	$ 135,463	$ 120,183
Cost of revenues	23,700	20,402	45,067	40,160
Gross profit	44,829	40,689	90,396	80,023
Operating expenses
Sales and marketing	17,545	18,424	35,467	37,071
Research and development	6,509	5,293	12,701	10,425
General and administrative	10,179	9,974	22,949	20,104
Amortization of intangible assets	1,266	1,033	2,570	2,158
Total operating expenses	35,499	34,724	73,687	69,758
Income from operations	9,330	5,965	16,709	10,265
Other income (expense)
Interest income, net	813	547	1,390	961
Other income (expense), net	240	(168)	193	(322)
Change in earn-out liability	400		344
Total other income, net	1,453	379	1,927	639
Income before income taxes	10,783	6,344	18,636	10,904
Income tax expense	1,987	928	3,027	2,234
Net income	8,796	5,416	15,609	8,670
Other comprehensive income (expense)
Foreign currency translation adjustments	291	(1,176)	1,030	(2,231)
Unrealized gain on investments, net of tax of $37, $34, $67, and $47, respectively	110	102	200	141
Reclassification of gain on investments into earnings, net of tax of ($29), ($45), ($60) and ($53), respectively	(88)	(134)	(180)	(158)
Total other comprehensive income (expense)	313	(1,208)	1,050	(2,248)
Comprehensive income	$ 9,109	$ 4,208	$ 16,659	$ 6,422
Net income per share
Basic	$ 0.50	$ 0.32	$ 0.89	$ 0.51
Diluted	$ 0.49	$ 0.31	$ 0.87	$ 0.50
Weighted average common shares used to compute net income per share
Basic	17,505	17,163	17,488	17,140
Diluted	18,010	17,549	18,003	17,446

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Unrealized gain on investments, tax	$ 37	$ 34	$ 67	$ 47
Reclassification of gain on investments into earnings, tax	$ (29)	$ (45)	$ (60)	$ 53

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2017	$ 288,111	$ 17	$ (5,815)	$ 301,863	$ (8,611)	$ 657
Beginning balance, shares at Dec. 31, 2017		17,127,006	122,147
Stock-based compensation	6,068			6,068
Exercise of stock options and issuance of restricted stock	5,120			5,120
Exercise of stock options and issuance of restricted stock, shares		205,964
Employee stock purchase plan	$ 836			836
Employee stock purchase plan, shares	4,000	20,243
Repurchases of common stock	$ (11,869)		$ (11,869)
Repurchases of common stock, shares		(193,394)	193,394
Net income	8,670				8,670
Foreign currency translation adjustments	(2,231)					(2,231)
Reclassification of gain on investments into earnings, net of tax	(158)					(158)
Unrealized gain on investments, net of tax	141					141
Ending balance at Jun. 30, 2018	294,688	$ 17	$ (17,684)	313,887	59	(1,591)
Ending balance, shares at Jun. 30, 2018		17,159,819	315,541
Beginning balance at Mar. 31, 2018	288,350	$ 17	$ (11,686)	305,759	(5,357)	(383)
Beginning balance, shares at Mar. 31, 2018		17,109,949	236,131
Stock-based compensation	2,887			2,887
Exercise of stock options and issuance of restricted stock	4,405			4,405
Exercise of stock options and issuance of restricted stock, shares		109,037
Employee stock purchase plan	$ 836			836
Employee stock purchase plan, shares	5,000	20,243
Repurchases of common stock	$ (5,998)		$ (5,998)
Repurchases of common stock, shares		(79,410)	79,410
Net income	5,416				5,416
Foreign currency translation adjustments	(1,176)					(1,176)
Reclassification of gain on investments into earnings, net of tax	(134)					(134)
Unrealized gain on investments, net of tax	102					102
Ending balance at Jun. 30, 2018	294,688	$ 17	$ (17,684)	313,887	59	(1,591)
Ending balance, shares at Jun. 30, 2018		17,159,819	315,541
Beginning balance at Dec. 31, 2018	318,974	$ 18	$ (25,679)	332,592	15,261	(3,218)
Beginning balance, shares at Dec. 31, 2018		17,345,736	411,892
Stock-based compensation	7,508			7,508
Exercise of stock options and issuance of restricted stock	3,371			3,371
Exercise of stock options and issuance of restricted stock, shares		201,571
Employee stock purchase plan	1,079			1,079
Employee stock purchase plan, shares		15,407
Repurchases of common stock	(8,966)		$ (8,966)
Repurchases of common stock, shares		(91,847)	91,847
Settlement and subsequent return of shares	(300)			(300)
Settlement and subsequent return of shares, shares		(2,761)
Net income	15,609				15,609
Foreign currency translation adjustments	1,030					1,030
Reclassification of gain on investments into earnings, net of tax	(180)					(180)
Unrealized gain on investments, net of tax	200					200
Adoption of ASU 2018-02	8					8
Ending balance at Jun. 30, 2019	338,333	$ 18	$ (34,645)	344,250	30,870	(2,160)
Ending balance, shares at Jun. 30, 2019		17,468,106	503,739
Beginning balance at Mar. 31, 2019	330,704	$ 18	$ (28,645)	339,730	22,074	(2,473)
Beginning balance, shares at Mar. 31, 2019		17,467,682	445,624
Stock-based compensation	2,542			2,542
Exercise of stock options and issuance of restricted stock	899			899
Exercise of stock options and issuance of restricted stock, shares		43,132
Employee stock purchase plan	1,079			1,079
Employee stock purchase plan, shares		15,407
Repurchases of common stock	(6,000)		$ (6,000)
Repurchases of common stock, shares		(58,115)	58,115
Net income	8,796				8,796
Foreign currency translation adjustments	291					291
Reclassification of gain on investments into earnings, net of tax	(88)					(88)
Unrealized gain on investments, net of tax	110					110
Ending balance at Jun. 30, 2019	$ 338,333	$ 18	$ (34,645)	$ 344,250	$ 30,870	$ (2,160)
Ending balance, shares at Jun. 30, 2019		17,468,106	503,739

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income	$ 15,609	$ 8,670
Reconciliation of net income to net cash provided by operating activities
Deferred income taxes	2,634	1,498
Change in earn-out liability	(344)
Depreciation and amortization of property and equipment	5,324	4,176
Amortization of intangible assets	2,570	2,158
Provision for doubtful accounts	1,504	985
Stock-based compensation	8,169	6,712
Other, net	(357)	(211)
Changes in assets and liabilities
Accounts receivable	(4,769)	(4,373)
Deferred costs	(56)	(2,621)
Other current and non-current assets	(549)	(710)
Accounts payable	(490)	189
Accrued compensation	(5,210)	(1,464)
Accrued expenses	404	62
Deferred revenue	5,250	6,237
Deferred rent		939
Operating leases	(27)
Net cash provided by operating activities	29,662	22,247
Cash flows from investing activities
Purchases of property and equipment	(5,351)	(6,481)
Purchases of investments	(44,548)	(52,116)
Maturities of investments	37,725	45,000
Acquisitions of businesses and intangible assets, net of cash acquired		(381)
Net cash used in investing activities	(12,174)	(13,978)
Cash flows from financing activities
Repurchases of common stock	(8,966)	(11,869)
Net proceeds from exercise of options to purchase common stock	3,371	5,120
Net proceeds from employee stock purchase plan	1,079	836
Net cash used in financing activities	(4,516)	(5,913)
Effect of foreign currency exchange rate changes	192	(98)
Net increase in cash and cash equivalents	13,164	2,258
Cash and cash equivalents at beginning of period	133,859	123,127
Cash and cash equivalents at end of period	$ 147,023	$ 125,385

General

6 Months Ended

Jun. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

General

NOTE A – General

Business Description

SPS Commerce is a leading provider of cloud-based supply chain management solutions that make it easier for retailers, suppliers, grocers, distributors and logistics firms to orchestrate the management of item data, order fulfillment, inventory control and sales analytics across all channels. The solutions offered by SPS Commerce eliminate the need for on-premise software and support staff by taking on that capability on the customer’s behalf. The solutions SPS Commerce provides allow our customers to increase their supply cycle agility, optimize their inventory levels and sell-through, reduce operational costs and gain increased visibility into customer orders, ensuring that suppliers, grocers, distributors, and logistics firms can satisfy exacting retailer requirements.

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, stockholders’ equity, 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. For further information, refer to the consolidated financial statements and accompanying notes for the year ended December 31, 2018 included in our Annual Report on Form 10-K/A filed with the SEC.

Effective January 1, 2019, we adopted the requirements of Accounting Standards Update (“ASU”) No. 2016-02, Leases (Topic 842), and used the effective date as our date of initial application. Consequently, financial information was not updated and the disclosures required under the new standard were not provided for dates and periods before January 1, 2019. The new standard provides several optional practical expedients in transition. We elected the “package of practical expedients,” which permits us not to reassess under the new standard our prior conclusions about lease identification, lease classification and initial direct costs. We did not elect the use-of hindsight or the practical expedient pertaining to land easements, the latter not being applicable to us. The new standard also provides practical expedients for an entity’s ongoing accounting. We elected the short-term lease recognition exemption for all leases that qualify, which means we will not recognize right-of-use (“ROU”) assets or lease liabilities for these leases. This includes not recognizing ROU assets or lease liabilities for existing short-term leases of those assets in transition. We also elected the practical expedient to not separate lease and non-lease components for all leases.

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, 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.

Lease Policy

We determine if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets, current lease liabilities, and long-term lease liabilities in our consolidated balance sheets.

ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. We estimate the discount rate for a similar collateralized asset by reviewing quoted costs of borrowing. We use the implicit interest rate when readily determinable. The operating lease ROU asset also includes any lease payments made and lease incentives that have been incurred. The options to extend our leases are not recognized as part of our right-of-use assets and lease liabilities unless it is reasonably certain that we will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. For all leases we combine non-lease components with the related lease components and account for it as a single lease component. The ROU assets are subject to the same impairment process as our long-lived assets. Additionally, we review our lease liabilities for remeasurement whenever there is a triggering event or when relevant facts and circumstances change.

Recently Adopted Accounting Pronouncements

Standard

Date of Issuance

Description

Date Adopted

Effect on the Financial Statements

ASU 2016-02, Leases and all related amendments

February

2016

Requires all leases with a term greater than 12 months to be recognized in the statements of financial position and eliminates current real estate-specific lease guidance, while maintaining substantially similar classification criteria for distinguishing between finance leases and operating leases.

January

2019

The adoption of this standard and related amendments resulted in the recognition of approximately $15.7 million in right-of-use assets and lease liabilities on our balance sheet as of January 1, 2019. Comparative periods will continue to be measured and presented under historical guidance, and only the period of adoption and future periods will be subject to this ASU. There was no cumulative effect on retained earnings or other components of equity at the adoption date. For more information see Note H.

ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220)

February

2018

Allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017 and requires certain disclosures regarding stranded tax effects in accumulated other comprehensive income.

January

2019

The adoption of this standard did not have a material impact on our consolidated financial statements.

Accounting Pronouncements Not Yet Adopted

Standard

Date of Issuance

Description

Date of Required

Adoption

Effect on the Financial Statements

ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Statements

June

2016

The amendment in this update replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses on instruments within its scope, including trade receivables. This update is intended to provide financial statement users with more decision-useful information about the expected credit losses.

January 2020

We are currently evaluating the impact of the adoption on our consolidated financial statements.

Significant Accounting Policies

Except for the accounting policy for leases that was updated as a result of adopting ASU 2016-02, there were no material changes in our significant accounting policies during the six months ended June 30, 2019. See Note A to the consolidated financial statements included in our Annual Report on Form 10-K/A for the year ended December 31, 2018, as filed with the SEC, for additional information regarding our significant accounting policies.

Business Acquisitions

6 Months Ended

Jun. 30, 2019

Business Combinations [Abstract]

Business Acquisitions

NOTE B – Business Acquisitions

EDIAdmin

On October 3, 2018, we completed our asset acquisition of EDIAdmin, a privately held company providing end-to-end integration solutions, featuring a dedicated Integration Platform as a Service (“iPaaS”) called Cloud Hybrid Integration Platform (“CHIP”) and collaborative managed services for leading systems and applications, both cloud-based and on-premise. Pursuant to the asset purchase agreement, we paid $7.5 million in cash to the owner of EDIAdmin. The purchase agreement also allowed the seller to receive up to $1.7 million in cash, which becomes payable in first quarter 2020 and 2021 contingent upon the completion of certain revenue milestones at December 31, 2019 and December 31, 2020. The fair value of this contingent consideration was $1.3 million at the date of acquisition and $1.0 million at June 30, 2019. During the three and six months ended June 30, 2019, we recognized income of $0.4 million and $0.3 million, respectively, in our consolidated statements of comprehensive income due to the remeasurement of the contingent liability. See Note E for further disclosures on the remeasurement of the contingent liability.

We allocated the purchase price to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date. The excess of the purchase price over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill. Goodwill is attributed to a trained workforce and other buyer-specific value resulting from expected synergies, including long-term cost savings, which are not included in the fair values of identifiable assets. The purchase accounting for the EDIAdmin acquisition was complete as of December 31, 2018. The consolidated balance sheet as of December 31, 2018 reflects the final allocation of the purchase price to the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition.

CovalentWorks

On December 18, 2018, we completed our asset acquisition of CovalentWorks, a privately held company providing cloud-based EDI solutions to small- and medium-sized businesses. Pursuant to the asset purchase agreement, we paid $19.4 million in cash and issued $3.4 million in common stock, or 40,478 shares, to the owners of CovalentWorks.

We allocated the purchase price to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date. The excess of the purchase price over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill. Goodwill is attributed to a trained workforce and other buyer-specific value resulting from expected synergies, including long-term cost savings, which are not included in the fair values of identifiable assets. The purchase accounting, purchase price allocation and net working capital adjustment for the CovalentWorks acquisition were finalized during the first quarter of 2019 and there have been no subsequent adjustments.

Revenue

6 Months Ended

Jun. 30, 2019

Revenue From Contract With Customer [Abstract]

Revenue

NOTE C – Revenue

We derive our revenues primarily from the following revenue streams (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Recurring revenues:
Fulfillment	$	53,694	$	46,480	$	106,139	$	91,844
Analytics		9,245		8,630		18,118		16,889
Other		1,417		1,320		2,845		2,557
Recurring Revenues		64,356		56,430		127,102		111,290
One-time revenues		4,173		4,661		8,361		8,893
	$	68,529	$	61,091	$	135,463	$	120,183

Revenues are recognized when our services are made available to our customers, in an amount that reflects the consideration we are contractually and legally entitled to in exchange for those services.

We determine revenue recognition through the following steps:

Identification of the contract, or contracts, with a customer

Identification of the performance obligations in the contract

Determination of the transaction price

Allocation of the transaction price to the performance obligations in the contract

Recognition of revenue when, or as, we satisfy a performance obligation

Recurring Revenues

Recurring revenues consists of recurring subscriptions from customers that utilize our Fulfillment, Analytics, and Other cloud-based supply chain management solutions. Revenue for these solutions is generally recognized on a ratable basis over the contract term beginning on the date that our service is made available to the customer. Our contracts with our recurring revenue customers are recurring in nature, ranging from monthly to annual, and generally allow the customer to cancel the contract for any reason with 30 to 90 days’ notice. Timing of billings varies by customer and by contract type and are either in advance or within 30 days of the service being performed.

The deferred revenue liability for recurring revenue contracts are for one year or less and recognized on a ratable basis over the contract term. We have applied the optional exemption under Accounting Standards Codification (“ASC”) 606-10-50-14(a) and will not disclose information about the remaining performance obligations for contracts which have original durations of one year or less.

One-time Revenues

One-time revenues consist of set-up fees from customers and miscellaneous one-time fees.

Set-up fees are specific for each connection a customer has with a trading partner and many of our customers have connections with numerous trading partners. Set-up fees related to our cloud-based supply chain management solutions are nonrefundable upfront fees that are necessary for our customers to utilize our cloud-based services. These set-up fees do not provide any standalone value to our customers. Except for our Analytics platform, we have determined the set-up fees represent a material renewal option right to our customers as they will not be incurred again upon renewal. These set-up fees and related costs are deferred and recognized ratably over two years, which is the estimated connection life between the customer and the trading partner. For our Analytics platform, we have determined the set-up fees do not represent a material customer renewal right and, as such, are deferred and recognized ratably over the estimated initial contract term, which is one year.

The table below presents the activity of the portion of the deferred revenue liability relating to set-up fees (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Balances, at beginning of period	$	9,813		$	9,952		$	9,857		$	10,031
Invoiced set-up fees		2,829			2,530			5,366			5,111
Amortized set-up fees		(2,579	)		(2,596	)		(5,160	)		(5,256	)
Balances, at end of period	$	10,063		$	9,886		$	10,063		$	9,886

The entire balance of set-up fees will be recognized within two years and, as such, current amounts will be recognized in the next 1-12 months and long-term amounts will be recognized in the next 13-24 months.

Miscellaneous one-time fees consist of professional services and testing and certification. The deferred revenue liability for these one-time fees are for one year or less and recognized at the time service is provided. We have applied the optional exemption under ASC 606-10-50-14(a) and will not disclose information about the remaining performance obligations for contracts which have original durations of one year or less.

Deferred Costs

6 Months Ended

Jun. 30, 2019

Deferred Costs [Abstract]

Deferred Costs

NOTE D – Deferred Costs

Deferred costs consist of costs to obtain customer contracts, such as commissions paid to sales personnel and to third-party partners for customer referrals, and costs to fulfill customer contracts, such as customer implementation costs.

Sales commissions relating to recurring revenues are considered incremental and recoverable costs of obtaining a contract with our customer. These commissions are calculated based on estimated annual recurring revenue to be generated over the customer’s initial contract year. These costs are deferred and amortized over the expected period of benefit which we have determined to be two years. Amortization expense is included in sales and marketing expenses in the accompanying condensed consolidated statements of operations.

Customer implementation costs are considered incremental and recoverable costs of obtaining a contract with our customer. These costs are deferred and amortized over the expected period of benefit which we have determined to be two years. Amortization expense is included in cost of revenues in the accompanying condensed consolidated statements of operations.

The table below presents the activity of deferred costs and amortization of deferred costs (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Balances, at beginning of period	$	45,891		$	41,557		$	45,475		$	39,933
Incurred deferred costs		11,880			11,910			24,212			24,416
Amortized deferred costs		(12,243	)		(10,923	)		(24,159	)		(21,805	)
Balances, at end of period	$	45,528		$	42,544		$	45,528		$	42,544

Financial Instruments

6 Months Ended

Jun. 30, 2019

Disclosure Text Block Supplement [Abstract]

Financial Instruments

NOTE E – Financial Instruments

We invest primarily in money market funds, certificates of deposit, highly liquid debt instruments of the U.S. government and U.S. corporate debt securities. All investments with remaining maturities less than one year from the balance sheet date are classified as short-term investments. Investments with remaining maturities of more than one year from the balance sheet date are classified as long-term investments. As of June 30, 2019 and December 31, 2018, all of our investments held were classified as short-term.

Our short-term marketable securities are 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.

Our marketable securities are carried at fair value and unrealized gains and losses on these investments, net of taxes, are included in accumulated other comprehensive loss in the consolidated balance sheets. Realized gains or losses are included in other income (expense), net in the consolidated statements of comprehensive income. 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 consolidated statements of comprehensive income.

Cash equivalents and short-term investments consisted of the following (in thousands):

	June 30, 2019
	Amortized		Unrealized			Fair
	Cost		Gains (Losses)			Value
Cash equivalents:
Money market funds	$	119,686	$	—		$	119,686
Certificate of deposit		7,023		—			7,023
Marketable securities:
Corporate bonds		14,816		(8	)		14,808
Commercial paper		14,905		25			14,930
U.S. treasury securities		14,727		163			14,890
Total	$	171,157	$	180		$	171,337

	December 31, 2018
	Amortized		Unrealized		Fair
	Cost		Gains		Value
Cash equivalents:
Money market funds	$	109,265	$	—	$	109,265
Certificate of deposit		7,000		—		7,000
Marketable securities:
Corporate bonds		15,194		40		15,234
Commercial paper		9,889		76		9,965
U.S. treasury securities		12,300		38		12,338
Total	$	153,648	$	154	$	153,802

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, 2019. We expect to receive the full principal and interest on all of these cash equivalents, certificate of deposit, 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. We obtain the fair values of our level 2 available-for-sale securities from a professional pricing service.

•

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

For the earn-out liability related to the EDIAdmin acquisition, the Company utilized the Monte Carlo simulation method to estimate the fair value of this contingent liability as of the reporting date. Thousands of iterations of the simulation were performed using forecasted revenues to develop a distribution of future values of recurring revenue which, in turn, provide indicated earn-out payments. The total estimated fair value equals the sum of the average present values of the indicated earn-out payments. Changes in assumptions described above could have an impact on the payout of contingent consideration with a maximum payout being $1.7 million. The earn-out liability has been measured as Level 3 given the unobservable inputs that are significant to the measurement of the liability.

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

	June 30, 2019
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	119,686	$	—	$	—	$	119,686
Certificate of deposit		7,023		—		—		7,023
Marketable securities:
Corporate bonds		—		14,808		—		14,808
Commercial paper		—		14,930		—		14,930
U.S. treasury securities		—		14,890		—		14,890
Total	$	126,709	$	44,628	$	—	$	171,337

Liabilities:
Earn-out liability	$	—	$	—	$	1,024	$	1,024
Total	$	—	$	—	$	1,024	$	1,024

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	109,265	$	—	$	—	$	109,265
Certificate of deposit		7,000		—		—		7,000
Marketable securities:
Corporate bonds		—		15,234		—		15,234
Commercial paper		—		9,965		—		9,965
U.S. treasury securities		—		12,338		—		12,338
Total	$	116,265	$	37,537	$	—	$	153,802

Liabilities:
Earn-out liability	$	—	$	—	$	1,368	$	1,368
Total	$	—	$	—	$	1,368	$	1,368

Goodwill and Intangible Assets, net

6 Months Ended

Jun. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, net

NOTE F – Goodwill and Intangible Assets, net

The changes in the net carrying amount of goodwill for the six months ended June 30, 2019 are as follows (in thousands):

	2019
Balances, January 1	$	69,658
Goodwill acquired during the period		—
Foreign currency translation adjustments		642
Balances, June 30	$	70,300

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

	June 30, 2019
						Foreign
	Carrying		Accumulated			Currency
	Amount		Amortization			Translation		Net
Subscriber relationships	$	42,240	$	(25,097	)	$	182	$	17,325
Non-competition agreements		2,495		(2,292	)		9		212
Technology and other		5,002		(2,169	)		9		2,842
	$	49,737	$	(29,558	)	$	200	$	20,379

	December 31, 2018
						Foreign
	Carrying		Accumulated			Currency
	Amount		Amortization			Translation			Net
Subscriber relationships	$	43,212	$	(23,284	)	$	(623	)	$	19,305
Non-competition agreements		2,560		(2,247	)		(28	)		285
Technology and other		5,199		(2,012	)		(36	)		3,151
	$	50,971	$	(27,543	)	$	(687	)	$	22,741

Total amortization expense for intangible assets was as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Amortization expense	$	1,266	$	1,033	$	2,570	$	2,158
	$	1,266	$	1,033	$	2,570	$	2,158

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

Remainder of 2019	$	2,540
2020		4,723
2021		3,883
2022		2,779
2023		2,706
Thereafter		3,748
	$	20,379

Other Assets

6 Months Ended

Jun. 30, 2019

Other Assets [Abstract]

Other Assets

NOTE G – Other Assets

The changes in the net amount of capitalized implementation costs for internal-use software from hosting arrangements for the six months ended June 30, 2019 is as follows (in thousands):

	2019
Balances, January 1	$	455
Capitalized implementation fees		517
Amortization of implementation fees		(26	)
Balances, June 30	$	946

There were no impairment losses in relation to the capitalized implementation costs for the period presented.

Leases

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Leases

NOTE H – Leases

We are obligated under non-cancellable operating leases, primarily for office space and certain equipment as follows (in thousands):

	June 30, 2019
	Remaining		Right-of-Use
	Term (years)		Asset
Minneapolis, MN lease		6	$	10,936
Little Falls, NJ lease		4		1,772
Other leases	1-3			1,330
			$	14,038

Some of our leases may include options to extend the leases for up to 5 years. The options to extend our leases are not recognized as part of our ROU assets and lease liabilities as it is not reasonably certain that we will exercise those options. Additionally, our agreements do not include options to terminate the leases.

On December 20, 2017, we executed the fourth amendment to our lease agreement for our current headquarters located in Minneapolis, Minnesota where we lease approximately 189,000 square feet under an agreement that expires on April 30, 2025. We have agreed to expand our headquarters premises by approximately 25,000 square feet during 2020. Our lease agreement also includes a further expansion right and a right of first offer to lease certain additional space and two options to extend the term of the lease for five years at a market rate determined in accordance with the lease. Incentives of $6.4 million are included as a lease component.

On February 25, 2016, we executed the first amendment to our lease agreement for our Little Falls, New Jersey location where we lease approximately 26,000 square feet under an agreement that expires on June 30, 2023. The agreement includes an option to extend the term of the lease for five years at a market rate determined in accordance with the lease. Incentives of $0.9 million are included as a lease component.

The components of lease expense were as follows (in thousands):

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2019		2019
Operating lease cost	$	620	$	1,306
Variable lease cost		835		1,639
	$	1,455	$	2,945

Operating lease cost for short-term leases was not material for the three and six months ended June 30, 2019.

Supplemental cash flow information related to leases was as follows (in thousands):

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2019		2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases		1,104		2,137
ROU obtained in exchange for operating lease liabilities		—		—

The ROU assets obtained in exchange for operating lease liabilities excludes the transition amount of $15.7 million.

Supplemental balance sheet information related to leases was as follows:

	June 30, 2019
Weighted-average remaining lease term - operating leases	5.3 years
Weighted-average discount rate - operating leases		4.5	%

At June 30, 2019, our future minimum payments under operating leases were as follows (in thousands):

Remainder of 2019	$	2,183
2020		3,648
2021		4,492
2022		4,042
2023		3,855
Thereafter		4,816
		23,036
Less: imputed interest		(2,677	)
	$	20,359

At December 31, 2018, our future minimum payments under operating leases were as follows (in thousands):

2019	$	4,209
2020		3,542
2021		4,414
2022		4,042
2023		3,855
Thereafter		4,816
		24,878

Stock-Based Compensation

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

NOTE I – 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 (“RSU”), to employees, non-employee directors and other consultants who provide services to us. We also provide an employee stock purchase plan and 401(k) stock match.

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 2019, 1,040,744 additional shares were reserved for future issuance under our 2010 Equity Incentive Plan. At June 30, 2019, there were approximately 6,162,889 million shares available for grant under approved equity compensation plans.

We recognize stock-based compensation expense on a straight-line basis over the vesting period, except for expense relating to retirement-eligible employees which is recognized immediately upon the employee becoming retirement-eligible.

Stock-based compensation expense was allocated in the condensed consolidated statements of comprehensive income as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Cost of revenues	$	662	$	504	$	1,249	$	1,052
Operating expenses
Sales and marketing		694		710		1,424		1,363
Research and development		602		357		1,125		686
General and administrative		917		1,608		4,371		3,611
Total stock-based compensation expense	$	2,875	$	3,179	$	8,169	$	6,712

Stock-based compensation expense by plan type was as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Stock options	$	655	$	739	$	1,929	$	1,993
Performance share units		151		74		1,074	886
Restricted stock units		1,419		1,829		3,862		2,751
Restricted stock awards		145		135		281		215
Employee stock purchase plan		171		110		361		223
401(k) stock match		334		292		662		644
Total stock-based compensation expense	$	2,875	$	3,179	$	8,169	$	6,712

As of June 30, 2019, there was approximately $20.0 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:

				Weighted Average
	Options			Exercise Price
	(#)			($/share)
Outstanding at December 31, 2018		873,234		$	51.86
Granted		91,909			107.83
Exercised		(114,480	)		41.66
Forfeited		(19,254	)		60.25
Outstanding at June 30, 2019		831,409			59.26

Of the total outstanding options at June 30, 2019, 570,649 were exercisable with a weighted average exercise price of $53.30 per share. The total outstanding options had a weighted average remaining contractual life of 3.32 years.

The weighted average grant date fair value of options granted during the first six months of 2019 was $33.72. This was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:

Volatility	33.2	%
Dividend yield	0	%
Life (in years)	4.4
Risk-free interest rate	2.41	%

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). The fair value is measured as the number of performance shares expected to be earned multiplied by the grant date fair value of our shares. The number of performance shares expected to vest during the current service period is estimated and the fair value of those shares is recognized over the remaining service period less any amounts already recognized.

In February 2018 and 2019, our executive officers were granted PSU awards with vesting contingent on the Company’s total shareholder return as compared to indexed total shareholder return over the course of a three-year performance period (fiscal years 2018 – 2020 and fiscal years 2019 – 2021, respectively). The grant date fair value was estimated using a Monte Carlo simulation that utilizes multiple input variables that determine the probability of satisfying the performance conditions stipulated in the award and calculates the fair market value for the PSUs granted. Expense is recognized on a straight-line basis over the vesting period, regardless of whether the market condition is satisfied.

RSUs 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 PSUs and restricted stock units was as follows:

				Weighted Average
	PSUs and RSUs			Grant Date Fair Value
	(#)			($/share)
Outstanding at December 31, 2018		377,335		$	59.90
Granted		98,203			112.46
Vested and common stock issued		(95,312	)		57.53
Forfeited		(11,460	)		61.41
Outstanding at June 30, 2019		368,766			74.46

The number of restricted stock units outstanding at June 30, 2019 included 25,617 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			Weighted Average Grant
	Awards (#)			Date Fair Value ($/share)
Outstanding at December 31, 2018		1,832		$	74.44
Restricted common stock issued		4,920			103.60
Restrictions lapsed		(3,062	)		86.15
Forfeited		—			—
Outstanding at June 30, 2019		3,690			103.60

Employee Stock Purchase Plan

We have an employee stock purchase plan which allows participating employees to purchase shares of our common stock at a discount through payroll deductions. The plan is available to all employees subject to certain eligibility requirements. Participating employees may purchase common stock, on a voluntary after tax basis, at a price that is the lower of 85% of the fair market value of one share of common stock at the beginning or end of each stock purchase period. The plan consists of two six-month offering periods, beginning on January 1 and July 1 of each calendar year, respectively. A total of 1.0 million shares of common stock are reserved for issuance under the plan.

For the offering periods that began on January 1, 2019 and January 1, 2018, we withheld approximately $1.2 million and $0.8 million from employees participating in the plan for the six months ended June 30, 2019 and 2018, respectively.

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	40	%
Dividend yield	0	%
Life (in years)	0.5
Risk-free interest rate	2.56	%

401(k) Stock Match

We sponsor a 401(k) retirement savings plan for our U.S. employees where employees can contribute up to 80% of their compensation, subject to the limits established by law. We match 50% of the employee’s elective deferrals, up to the first 6% of the employee’s pre-tax compensation for each pay period. A portion of our match is in company stock, which is purchased from the open market by our plan provider and immediately deposited into the employee’s 401(k) account.

Income Taxes

6 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

Income Taxes

NOTE J – 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 credits. Additionally, excess tax benefits generated upon settlement or exercise of stock awards are 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, 2019 we do not have any unrecognized tax benefits nor any accrued interest or tax penalties.

Net Income Per Share

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Net Income Per Share

NOTE K – 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,
	2019		2018		2019		2018
Numerator
Net income	$	8,796	$	5,416	$	15,609	$	8,670
Denominator
Weighted average common shares outstanding, basic		17,505		17,163		17,488		17,140
Options to purchase common stock		349		290		357		225
Restricted stock units		156		91		158		77
Employee stock purchase plan		—		5		—		4
Weighted average common shares outstanding, diluted		18,010		17,549		18,003		17,446
Net income per share
Basic	$	0.50	$	0.32	$	0.89	$	0.51
Diluted	$	0.49	$	0.31	$	0.87	$	0.50
Antidilutive shares (in thousands)		74		53		91		264

Subsequent Event

6 Months Ended

Jun. 30, 2019

Subsequent Events [Abstract]

Subsequent Event

NOTE L – Subsequent Event

On July 25, 2019, the Company’s board of directors declared a two-for-one stock split of the Company’s common stock, which will be effected in the form of a 100 percent share dividend, and will be distributed August 22, 2019, to shareholders of record as of August 8, 2019. The stock split will increase the number of shares outstanding from approximately 18.1 million shares to approximately 36.2 million shares.

General (Policies)

6 Months Ended

Jun. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Business Description

Basis of Presentation

Use of Estimates

Lease Policy

Recently Adopted Accounting Pronouncements

Standard

Date of Issuance

Description

Date Adopted

Effect on the Financial Statements

ASU 2016-02, Leases and all related amendments

February

2016

January

2019

ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220)

February

2018

January

2019

The adoption of this standard did not have a material impact on our consolidated financial statements.

Accounting Pronouncements Not Yet Adopted

Standard

Date of Issuance

Description

Date of Required

Adoption

Effect on the Financial Statements

ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Statements

June

2016

January 2020

We are currently evaluating the impact of the adoption on our consolidated financial statements.

Significant Accounting Policies

Revenue (Tables)

6 Months Ended

Jun. 30, 2019

Revenue From Contract With Customer [Abstract]

Summary of Revenues by Revenue Stream

We derive our revenues primarily from the following revenue streams (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Recurring revenues:
Fulfillment	$	53,694	$	46,480	$	106,139	$	91,844
Analytics		9,245		8,630		18,118		16,889
Other		1,417		1,320		2,845		2,557
Recurring Revenues		64,356		56,430		127,102		111,290
One-time revenues		4,173		4,661		8,361		8,893
	$	68,529	$	61,091	$	135,463	$	120,183

Summary of Deferred Revenue Liability Relating to Set-Up Fees

The table below presents the activity of the portion of the deferred revenue liability relating to set-up fees (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Balances, at beginning of period	$	9,813		$	9,952		$	9,857		$	10,031
Invoiced set-up fees		2,829			2,530			5,366			5,111
Amortized set-up fees		(2,579	)		(2,596	)		(5,160	)		(5,256	)
Balances, at end of period	$	10,063		$	9,886		$	10,063		$	9,886

Deferred Costs (Tables)

6 Months Ended

Jun. 30, 2019

Deferred Costs [Abstract]

Summary of Deferred Costs and Amortization of Deferred Costs

The table below presents the activity of deferred costs and amortization of deferred costs (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Balances, at beginning of period	$	45,891		$	41,557		$	45,475		$	39,933
Incurred deferred costs		11,880			11,910			24,212			24,416
Amortized deferred costs		(12,243	)		(10,923	)		(24,159	)		(21,805	)
Balances, at end of period	$	45,528		$	42,544		$	45,528		$	42,544

Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Financial Instruments Owned At Fair Value [Abstract]

Summary of Cash Equivalents and Short-term Investments

Cash equivalents and short-term investments consisted of the following (in thousands):

	June 30, 2019
	Amortized		Unrealized			Fair
	Cost		Gains (Losses)			Value
Cash equivalents:
Money market funds	$	119,686	$	—		$	119,686
Certificate of deposit		7,023		—			7,023
Marketable securities:
Corporate bonds		14,816		(8	)		14,808
Commercial paper		14,905		25			14,930
U.S. treasury securities		14,727		163			14,890
Total	$	171,157	$	180		$	171,337

	December 31, 2018
	Amortized		Unrealized		Fair
	Cost		Gains		Value
Cash equivalents:
Money market funds	$	109,265	$	—	$	109,265
Certificate of deposit		7,000		—		7,000
Marketable securities:
Corporate bonds		15,194		40		15,234
Commercial paper		9,889		76		9,965
U.S. treasury securities		12,300		38		12,338
Total	$	153,648	$	154	$	153,802

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

	June 30, 2019
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	119,686	$	—	$	—	$	119,686
Certificate of deposit		7,023		—		—		7,023
Marketable securities:
Corporate bonds		—		14,808		—		14,808
Commercial paper		—		14,930		—		14,930
U.S. treasury securities		—		14,890		—		14,890
Total	$	126,709	$	44,628	$	—	$	171,337

Liabilities:
Earn-out liability	$	—	$	—	$	1,024	$	1,024
Total	$	—	$	—	$	1,024	$	1,024

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	109,265	$	—	$	—	$	109,265
Certificate of deposit		7,000		—		—		7,000
Marketable securities:
Corporate bonds		—		15,234		—		15,234
Commercial paper		—		9,965		—		9,965
U.S. treasury securities		—		12,338		—		12,338
Total	$	116,265	$	37,537	$	—	$	153,802

Liabilities:
Earn-out liability	$	—	$	—	$	1,368	$	1,368
Total	$	—	$	—	$	1,368	$	1,368

Goodwill and Intangible Assets, net (Tables)

6 Months Ended

Jun. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Changes in Net Carrying Amount of Goodwill

The changes in the net carrying amount of goodwill for the six months ended June 30, 2019 are as follows (in thousands):

	2019
Balances, January 1	$	69,658
Goodwill acquired during the period		—
Foreign currency translation adjustments		642
Balances, June 30	$	70,300

Intangible Assets

	June 30, 2019
						Foreign
	Carrying		Accumulated			Currency
	Amount		Amortization			Translation		Net
Subscriber relationships	$	42,240	$	(25,097	)	$	182	$	17,325
Non-competition agreements		2,495		(2,292	)		9		212
Technology and other		5,002		(2,169	)		9		2,842
	$	49,737	$	(29,558	)	$	200	$	20,379

	December 31, 2018
						Foreign
	Carrying		Accumulated			Currency
	Amount		Amortization			Translation			Net
Subscriber relationships	$	43,212	$	(23,284	)	$	(623	)	$	19,305
Non-competition agreements		2,560		(2,247	)		(28	)		285
Technology and other		5,199		(2,012	)		(36	)		3,151
	$	50,971	$	(27,543	)	$	(687	)	$	22,741

Summary of amortization expense of intangible assets

Total amortization expense for intangible assets was as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Amortization expense	$	1,266	$	1,033	$	2,570	$	2,158
	$	1,266	$	1,033	$	2,570	$	2,158

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 (in thousands):

Remainder of 2019	$	2,540
2020		4,723
2021		3,883
2022		2,779
2023		2,706
Thereafter		3,748
	$	20,379

Other Assets (Tables)

6 Months Ended

Jun. 30, 2019

Other Assets [Abstract]

Summary of Changes in Net Amount of Capitalized Implementation Costs for Internal-use Software from Hosting Arrangements

The changes in the net amount of capitalized implementation costs for internal-use software from hosting arrangements for the six months ended June 30, 2019 is as follows (in thousands):

	2019
Balances, January 1	$	455
Capitalized implementation fees		517
Amortization of implementation fees		(26	)
Balances, June 30	$	946

Leases (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Summary of Non-Cancellable Operating Leases, Primarily for Office Space and Certain Equipment

We are obligated under non-cancellable operating leases, primarily for office space and certain equipment as follows (in thousands):

	June 30, 2019
	Remaining		Right-of-Use
	Term (years)		Asset
Minneapolis, MN lease		6	$	10,936
Little Falls, NJ lease		4		1,772
Other leases	1-3			1,330
			$	14,038

Components of Lease Expense

The components of lease expense were as follows (in thousands):

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2019		2019
Operating lease cost	$	620	$	1,306
Variable lease cost		835		1,639
	$	1,455	$	2,945

Schedule of Supplemental Cash Flow Information Related to Leases

Supplemental cash flow information related to leases was as follows (in thousands):

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2019		2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases		1,104		2,137
ROU obtained in exchange for operating lease liabilities		—		—

Schedule of Supplemental Balance Sheet Information Related to Leases

Supplemental balance sheet information related to leases was as follows:

	June 30, 2019
Weighted-average remaining lease term - operating leases	5.3 years
Weighted-average discount rate - operating leases		4.5	%

Schedule of Future Minimum Payments Under Operating Leases

At June 30, 2019, our future minimum payments under operating leases were as follows (in thousands):

Remainder of 2019	$	2,183
2020		3,648
2021		4,492
2022		4,042
2023		3,855
Thereafter		4,816
		23,036
Less: imputed interest		(2,677	)
	$	20,359

Schedule of Future Minimum Payments Under Operating Leases

At December 31, 2018, our future minimum payments under operating leases were as follows (in thousands):

2019	$	4,209
2020		3,542
2021		4,414
2022		4,042
2023		3,855
Thereafter		4,816
		24,878

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Stock-Based Compensation Expense

Stock-based compensation expense was allocated in the condensed consolidated statements of comprehensive income as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Cost of revenues	$	662	$	504	$	1,249	$	1,052
Operating expenses
Sales and marketing		694		710		1,424		1,363
Research and development		602		357		1,125		686
General and administrative		917		1,608		4,371		3,611
Total stock-based compensation expense	$	2,875	$	3,179	$	8,169	$	6,712

Stock-based compensation expense by plan type was as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Stock options	$	655	$	739	$	1,929	$	1,993
Performance share units		151		74		1,074	886
Restricted stock units		1,419		1,829		3,862		2,751
Restricted stock awards		145		135		281		215
Employee stock purchase plan		171		110		361		223
401(k) stock match		334		292		662		644
Total stock-based compensation expense	$	2,875	$	3,179	$	8,169	$	6,712

Stock Option Activity

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

				Weighted Average
	Options			Exercise Price
	(#)			($/share)
Outstanding at December 31, 2018		873,234		$	51.86
Granted		91,909			107.83
Exercised		(114,480	)		41.66
Forfeited		(19,254	)		60.25
Outstanding at June 30, 2019		831,409			59.26

Weighted Average Grant Date Fair Value of Options Granted, Assumptions

Volatility	33.2	%
Dividend yield	0	%
Life (in years)	4.4
Risk-free interest rate	2.41	%

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	40	%
Dividend yield	0	%
Life (in years)	0.5
Risk-free interest rate	2.56	%

Performance Share Units and Restricted Stock Units [Member]

Performance Share Units and Restricted Stock Units and Restricted Stock Awards

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

				Weighted Average
	PSUs and RSUs			Grant Date Fair Value
	(#)			($/share)
Outstanding at December 31, 2018		377,335		$	59.90
Granted		98,203			112.46
Vested and common stock issued		(95,312	)		57.53
Forfeited		(11,460	)		61.41
Outstanding at June 30, 2019		368,766			74.46

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			Weighted Average Grant
	Awards (#)			Date Fair Value ($/share)
Outstanding at December 31, 2018		1,832		$	74.44
Restricted common stock issued		4,920			103.60
Restrictions lapsed		(3,062	)		86.15
Forfeited		—			—
Outstanding at June 30, 2019		3,690			103.60

Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2019

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,
	2019		2018		2019		2018
Numerator
Net income	$	8,796	$	5,416	$	15,609	$	8,670
Denominator
Weighted average common shares outstanding, basic		17,505		17,163		17,488		17,140
Options to purchase common stock		349		290		357		225
Restricted stock units		156		91		158		77
Employee stock purchase plan		—		5		—		4
Weighted average common shares outstanding, diluted		18,010		17,549		18,003		17,446
Net income per share
Basic	$	0.50	$	0.32	$	0.89	$	0.51
Diluted	$	0.49	$	0.31	$	0.87	$	0.50
Antidilutive shares (in thousands)		74		53		91		264

General - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Schedule Of Accounting Policies [Line Items]
Operating leases, right of use assets	$ 14,038
Operating leases, lease liabilities	$ 20,359
ASU 2016-02 [Member]
Schedule Of Accounting Policies [Line Items]
Operating leases, right of use assets		$ 15,700
Operating leases, lease liabilities		$ 15,700

Business Acquisitions - Additional Information (Detail) - USD ($)			3 Months Ended	6 Months Ended
	Dec. 18, 2018	Oct. 03, 2018	Jun. 30, 2019	Jun. 30, 2019
E D I Admin [Member]
Business Acquisition [Line Items]
Payments to acquire business		$ 7,500,000
Maximum payout of contingent consideration		1,700,000
Fair value of contingent consideration		$ 1,300,000	$ 1,000,000.0	$ 1,000,000.0
E D I Admin [Member] \| Contingent Consideration Liability [Member]
Business Acquisition [Line Items]
Other income			$ 400,000	$ 300,000
CovalentWorks [Member]
Business Acquisition [Line Items]
Payments to acquire business	$ 19,400,000
Stock issued for acquisition	$ 3,400,000
Stock issued for acquisition, Shares	40,478

Revenue - Summary of Revenues by Revenue Stream (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue Recognition [Line Items]
Revenues	$ 68,529	$ 61,091	$ 135,463	$ 120,183
Recurring Revenues [Member]
Revenue Recognition [Line Items]
Revenues	64,356	56,430	127,102	111,290
One-time Revenues [Member]
Revenue Recognition [Line Items]
Revenues	4,173	4,661	8,361	8,893
Fulfillment [Member] \| Recurring Revenues [Member]
Revenue Recognition [Line Items]
Revenues	53,694	46,480	106,139	91,844
Analytics [Member] \| Recurring Revenues [Member]
Revenue Recognition [Line Items]
Revenues	9,245	8,630	18,118	16,889
Other [Member] \| Recurring Revenues [Member]
Revenue Recognition [Line Items]
Revenues	$ 1,417	$ 1,320	$ 2,845	$ 2,557

Revenue - Additional Information (Detail)	6 Months Ended
Revenue - Additional Information (Detail)	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Earliest timing of billings	in advance
Latest timing of billings	30 days
Estimated period for material rights present to customers	2 years
Set up fees recognized period	2 years
Maximum recognition period for miscellaneous one-time fee	1 year
Analytics Solution [Member]
Disaggregation Of Revenue [Line Items]
Set up fees recognized period	1 year
Minimum [Member]
Disaggregation Of Revenue [Line Items]
Customer contract cancellation period	30 days
Current amount recognition period of set up fees	1 month
Long term amount recognition period of set up fees	13 months
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Customer contract cancellation period	90 days
Deferred revenue recognition period	1 year
Contract period for remaining performance obligations for contracts in which the optional exemption under ASC 606-10-50-14(a) was applied	1 year
Current amount recognition period of set up fees	12 months
Long term amount recognition period of set up fees	24 months

Revenue - Summary of Deferred Revenue Liability Relating to Set-Up Fees (Detail) - Set-Up Fees [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Deferred Revenue Arrangement [Line Items]
Balances, at beginning of period	$ 9,813	$ 9,952	$ 9,857	$ 10,031
Invoiced set-up fees	2,829	2,530	5,366	5,111
Amortized set-up fees	(2,579)	(2,596)	(5,160)	(5,256)
Balances, at end of period	$ 10,063	$ 9,886	$ 10,063	$ 9,886

Deferred Costs - Additional Information (Detail)	6 Months Ended
Deferred Costs - Additional Information (Detail)	Jun. 30, 2019
Deferred Costs [Abstract]
Deferred commission expected amortization period	2 years
Deferred customer implementation costs expected amortization period	2 years

Deferred Costs - Summary of Deferred Costs and Amortization of Deferred Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Deferred Costs [Abstract]
Balances, at beginning of period	$ 45,891	$ 41,557	$ 45,475	$ 39,933
Incurred deferred costs	11,880	11,910	24,212	24,416
Amortized deferred costs	(12,243)	(10,923)	(24,159)	(21,805)
Balances, at end of period	$ 45,528	$ 42,544	$ 45,528	$ 42,544

Financial Instruments - Summary of Cash Equivalents and Short-term Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Money Market Funds [Member]
Schedule of Financial Instruments [Line Items]
Amortized Cost	$ 119,686	$ 109,265
Fair Value	119,686	109,265
Certificate of Deposit [Member]
Schedule of Financial Instruments [Line Items]
Amortized Cost	7,023	7,000
Fair Value	7,023	7,000
Corporate Bonds [Member]
Schedule of Financial Instruments [Line Items]
Amortized Cost	14,816	15,194
Unrealized Gains (Losses)	(8)	40
Fair Value	14,808	15,234
Commercial Paper [Member]
Schedule of Financial Instruments [Line Items]
Amortized Cost	14,905	9,889
Unrealized Gains (Losses)	25	76
Fair Value	14,930	9,965
U.S. Treasury Securities [Member]
Schedule of Financial Instruments [Line Items]
Amortized Cost	14,727	12,300
Unrealized Gains (Losses)	163	38
Fair Value	14,890	12,338
Financial Instruments [Member]
Schedule of Financial Instruments [Line Items]
Amortized Cost	171,157	153,648
Unrealized Gains (Losses)	180	154
Fair Value	$ 171,337	$ 153,802

Financial Instruments - Additional Information (Detail) - E D I Admin [Member]	Oct. 03, 2018 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maximum payout of contingent consideration	$ 1,700,000
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maximum payout of contingent consideration	$ 1,700,000

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, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	$ 171,337	$ 153,802
Liabilities fair value	1,024	1,368
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	119,686	109,265
Certificate of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	7,023	7,000
Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	14,808	15,234
Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	14,930	9,965
U.S. Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	14,890	12,338
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	126,709	116,265
Level 1 [Member] \| Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	119,686	109,265
Level 1 [Member] \| Certificate of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	7,023	7,000
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	44,628	37,537
Level 2 [Member] \| Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	14,808	15,234
Level 2 [Member] \| Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	14,930	9,965
Level 2 [Member] \| U.S. Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	14,890	12,338
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities fair value	$ 1,024	$ 1,368

Goodwill and Intangible Assets, net - Schedule of Changes in Net Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Balances, January 1	$ 69,658
Foreign currency translation adjustments	642
Balances, June 30	$ 70,300

Goodwill and Intangible Assets, net - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019
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	10 years

Goodwill and Intangible Assets, net - Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	$ 49,737	$ 50,971
Accumulated Amortization	(29,558)	(27,543)
Foreign Currency Translation	200	(687)
Net	20,379	22,741
Subscriber Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	42,240	43,212
Accumulated Amortization	(25,097)	(23,284)
Foreign Currency Translation	182	(623)
Net	17,325	19,305
Non-competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	2,495	2,560
Accumulated Amortization	(2,292)	(2,247)
Foreign Currency Translation	9	(28)
Net	212	285
Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	5,002	5,199
Accumulated Amortization	(2,169)	(2,012)
Foreign Currency Translation	9	(36)
Net	$ 2,842	$ 3,151

Goodwill and Intangible Assets, net - Summary of Amortization Expense of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 1,266	$ 1,033	$ 2,570	$ 2,158

Goodwill and Intangible Assets, net - Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2019	$ 2,540
2020	4,723
2021	3,883
2022	2,779
2023	2,706
Thereafter	3,748
Net	$ 20,379	$ 22,741

Other Assets - Summary of Changes in Net Amount of Capitalized Implementation Costs for Internal-use Software from Hosting Arrangements (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Capitalized Computer Software Net [Abstract]
Balances, January 1	$ 455
Capitalized implementation fees	517
Amortization of implementation fees	(26)
Balances, June 30	$ 946

Other Assets - Additional Information (Detail)	6 Months Ended
Other Assets - Additional Information (Detail)	Jun. 30, 2019 USD ($)
Capitalized Computer Software Net [Abstract]
Impairment losses on capitalized implementation costs	$ 0

Leases - Summary of Non-Cancellable Operating Leases, Primarily for Office Space and Certain Equipment (Detail) $ in Thousands	Jun. 30, 2019 USD ($)
Lessee Lease Description [Line Items]
Right-of-Use Asset	$ 14,038
Minneapolis, MN Lease [Member]
Lessee Lease Description [Line Items]
Remaining Term (years)	6 years
Right-of-Use Asset	$ 10,936
Little Falls, NJ Lease [Member]
Lessee Lease Description [Line Items]
Remaining Term (years)	4 years
Right-of-Use Asset	$ 1,772
Other Leases [Member]
Lessee Lease Description [Line Items]
Right-of-Use Asset	$ 1,330
Other Leases [Member] \| Minimum [Member]
Lessee Lease Description [Line Items]
Remaining Term (years)	1 year
Other Leases [Member] \| Maximum [Member]
Lessee Lease Description [Line Items]
Remaining Term (years)	3 years

Leases - Additional Information (Detail) $ in Millions			6 Months Ended
Leases - Additional Information (Detail) $ in Millions	Dec. 20, 2017 ft² Option	Feb. 25, 2016 ft²	Jun. 30, 2019 USD ($)	Dec. 31, 2020 ft²
Lessee Lease Description [Line Items]
Lease extension period, number of years			5 years
ASU 2016-02 [Member]
Lessee Lease Description [Line Items]
Transition amount \| $			$ 15.7
Little Falls, NJ Lease [Member]
Lessee Lease Description [Line Items]
Lease extension period, number of years		5 years
Current leased space \| ft²		26,000
Lease agreement expires, date		Jun. 30, 2023
Incentives \| $			0.9
Current Headquarters [Member]
Lessee Lease Description [Line Items]
Lease extension period, number of years	5 years
Lease agreement expires, date	Apr. 30, 2025
Number of options to extend term of the lease \| Option	2
Incentives \| $			$ 6.4
Current Headquarters [Member] \| Minneapolis, Minnesota [Member]
Lessee Lease Description [Line Items]
Current leased space \| ft²	189,000
Current Headquarters [Member] \| Scenario, Forecast [Member] \| Minneapolis, Minnesota [Member]
Lessee Lease Description [Line Items]
Future expansion of headquarters premises \| ft²				25,000

Leases - Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 620	$ 1,306
Variable lease cost	835	1,639
Lease expense	$ 1,455	$ 2,945

Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 1,104	$ 2,137

Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Detail)	Jun. 30, 2019
Leases [Abstract]
Weighted-average remaining lease term - operating leases	5 years 3 months 18 days
Weighted-average discount rate - operating leases	4.50%

Leases - Schedule of Future Minimum Payments Under Operating Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Remainder of 2019	$ 2,183
2020	3,648
2021	4,492
2022	4,042
2023	3,855
Thereafter	4,816
Future minimum payments	23,036
Less: imputed interest	(2,677)
Operating lease liability	$ 20,359
2019		$ 4,209
2020		3,542
2021		4,414
2022		4,042
2023		3,855
Thereafter		4,816
Operating leases, total		$ 24,878

Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	1 Months Ended			6 Months Ended
	Feb. 28, 2019 shares	Feb. 28, 2018	Feb. 28, 2017	Jun. 30, 2019 USD ($) Offering $ / shares shares	Jun. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant				6,162,889
Unrecognized stock-based compensation expense \| $				$ 20.0
Unrecognized stock-based compensation, expected to be recognized, weighted average period				2 years 9 months 18 days
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares reserved for issuance under the plan				1,000,000.0
Purchase price as a percentage of fair market value				85.00%
Number of offerings per year \| Offering				2
Amount withheld from employees \| $				$ 1.2	$ 0.8
Equity Incentive Plan [Member] \| 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares reserved for issuance under the plan	1,040,744
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Stock options exercisable				570,649
Weighted average exercise price \| $ / shares				$ 53.30
Weighted average remaining contractual life				3 years 3 months 25 days
Weighted average fair value per share of options granted \| $ / shares				$ 33.72
Stock Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options contractual term range				7 years
Stock Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options contractual term range				10 years
Performance Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years	3 years	3 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Number of RSU's vested and not issued during the period				25,617
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards units vest over, period				1 year
401(k) Stock Match [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum allowable contribution by employee percentage				80.00%
Defined benefit plan employer matching contribution percent				50.00%
Maximum annual contribution per employee, percent				6.00%

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 2,875	$ 3,179	$ 8,169	$ 6,712
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	655	739	1,929	1,993
Performance Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Performance Share Units	151	74	1,074	886
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	1,419	1,829	3,862	2,751
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	145	135	281	215
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	171	110	361	223
401(k) Stock Match [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	334	292	662	644
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	662	504	1,249	1,052
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	694	710	1,424	1,363
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	602	357	1,125	686
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 917	$ 1,608	$ 4,371	$ 3,611

Stock-Based Compensation - Stock Option Activity (Detail)	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, Beginning balance \| shares	873,234
Options, Granted \| shares	91,909
Options, Exercised \| shares	(114,480)
Options, Forfeited \| shares	(19,254)
Options Outstanding, Ending balance \| shares	831,409
Weighted Average Exercise Price, Outstanding, Beginning Balance \| $ / shares	$ 51.86
Weighted Average Exercise Price, Granted \| $ / shares	107.83
Weighted Average Exercise Price, Exercised \| $ / shares	41.66
Weighted Average Exercise Price, Forfeited \| $ / shares	60.25
Weighted Average Exercise Price, Outstanding, Ending Balance \| $ / shares	$ 59.26

Stock-Based Compensation - Weighted Average Grant Date Fair Value of Options Granted, Assumptions (Detail) - Stock Options [Member]	6 Months Ended
	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	33.20%
Dividend yield	0.00%
Life (in years)	4 years 4 months 24 days
Risk-free interest rate	2.41%

Stock-Based Compensation - Performance Share Units and Restricted Stock Units (Detail) - Performance Share Units and Restricted Stock Units [Member]	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding, Beginning Balance \| shares	377,335
Granted, stock units \| shares	98,203
Vested and common stock issued, stock units \| shares	(95,312)
Forfeited, stock units \| shares	(11,460)
Stock awards, Outstanding, Ending Balance \| shares	368,766
Weighted average grant date fair value, Outstanding, Beginning Balance \| $ / shares	$ 59.90
Granted, Weighted Average Grant Date Fair Value \| $ / shares	112.46
Vested and common stock issued, Weighted Average Grant Date Fair Value \| $ / shares	57.53
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	61.41
Weighted average grant date fair value, Outstanding, Ending Balance \| $ / shares	$ 74.46

Stock-Based Compensation - Restricted Stock Awards (Detail) - Restricted Stock Award [Member]	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding, Beginning Balance \| shares	1,832
Restricted common stock issued, stock awards \| shares	4,920
Restrictions lapsed, stock awards \| shares	(3,062)
Stock awards, Outstanding, Ending Balance \| shares	3,690
Weighted average grant date fair value, Outstanding, Beginning Balance \| $ / shares	$ 74.44
Restricted common stock issued, Weighted Average Grant Date Fair Value \| $ / shares	103.60
Restrictions lapsed, Weighted Average Grant Date Fair Value \| $ / shares	86.15
Weighted average grant date fair value, Outstanding, Ending Balance \| $ / shares	$ 103.60

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, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	40.00%
Dividend yield	0.00%
Life (in years)	6 months
Risk-free interest rate	2.56%

Income Taxes - Additional Information (Detail)	Jun. 30, 2019 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, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator
Net income	$ 8,796	$ 5,416	$ 15,609	$ 8,670
Denominator
Weighted average common shares outstanding, basic	17,505	17,163	17,488	17,140
Options to purchase common stock	349	290	357	225
Restricted stock units	156	91	158	77
Employee stock purchase plan		5		4
Weighted average common shares outstanding, diluted	18,010	17,549	18,003	17,446
Net income per share
Basic	$ 0.50	$ 0.32	$ 0.89	$ 0.51
Diluted	$ 0.49	$ 0.31	$ 0.87	$ 0.50
Antidilutive shares (in thousands)	74	53	91	264

Subsequent Event - Additional Information (Detail)	Jul. 25, 2019	Aug. 22, 2019 shares	Aug. 21, 2019 shares	Jun. 30, 2019 shares	Dec. 31, 2018 shares
Subsequent Event [Line Items]
Common stock, shares outstanding				17,468,106	17,345,736
Scenario, Forecast [Member]
Subsequent Event [Line Items]
Common stock, shares outstanding		36,200,000	18,100,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock split ratio	2
Percentage of stock dividend from stock split	100.00%