0001564590-21-021965 | 10-Q | XBRL Viewer

Revenue (Tables)

3 Months Ended

Mar. 31, 2021

Revenue From Contract With Customer [Abstract]

We derive our revenues from the following revenue streams:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Recurring revenues:
Fulfillment	$	71,404	$	59,103
Analytics		10,144		9,736
Other		1,253		1,199
Recurring Revenues		82,801		70,038
One-time revenues		7,293		4,154
	$	90,094	$	74,192

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:

	Three Months Ended
	March 31,
(In thousands)	2021			2020
Balance, beginning of period	$	11,118		$	10,518
Invoiced set-up fees		3,867			2,719
Amortized set-up fees		(2,883	)		(2,665	)
Balance, end of period	$	12,102		$	10,572

Commitments and Contingencies - Summary of Non-Cancellable Operating Leases, Primarily for Office Space (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Lessee Lease Description [Line Items]
Right-of-Use Asset	$ 15,296	$ 15,581
Minneapolis, MN Lease [Member]
Lessee Lease Description [Line Items]
Remaining Term	6 years	6 years
Right-of-Use Asset	$ 11,095	$ 10,992
Kyiv, Ukraine Lease [Member]
Lessee Lease Description [Line Items]
Remaining Term	4 years	4 years
Right-of-Use Asset	$ 1,832	$ 1,930
Other Leases [Member]
Lessee Lease Description [Line Items]
Right-of-Use Asset	$ 2,369	$ 2,659
Other Leases [Member] \| Minimum [Member]
Lessee Lease Description [Line Items]
Remaining Term	1 year	1 year
Other Leases [Member] \| Maximum [Member]
Lessee Lease Description [Line Items]
Remaining Term	5 years	5 years

Goodwill and Intangible Assets, net - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2021
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets useful life	3 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets useful life	10 years

Geographic Information	3 Months Ended
Mar. 31, 2021
Revenue From Contract With Customer [Abstract]
Geographic Information	NOTE N – Geographic Information For the three months ended March 31, 2021 and 2020, 84% and 85% of our revenue, respectively, was attributable to customers based within the U.S. No single jurisdiction outside of the U.S. had revenues in excess of 10%. At March 31, 2021 and 2020, 15% and 8%, respectively, of property and equipment, net was located at subsidiary and office locations outside of the U.S.

Geographic Information

3 Months Ended

Mar. 31, 2021

Revenue From Contract With Customer [Abstract]

Geographic Information

NOTE N – Geographic Information

For the three months ended March 31, 2021 and 2020, 84% and 85% of our revenue, respectively, was attributable to customers based within the U.S. No single jurisdiction outside of the U.S. had revenues in excess of 10%.

At March 31, 2021 and 2020, 15% and 8%, respectively, of property and equipment, net was located at subsidiary and office locations outside of the U.S.

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	13.6
Unrecognized stock-based compensation expense	$ 40.6
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]
Common stock reserved for future issuance	1.9
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding and exercisable options	0.7
Weighted average exercise price	$ 33.82
Weighted average remaining contractual life	3 years 4 months 24 days
Weighted average fair value per share of options granted	$ 31.16
Performance Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years	3 years	3 years
Shares of common stock issued	0.1

Deferred Costs - Summary of Deferred Costs and Amortization of Deferred Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Deferred Costs [Abstract]
Balance, beginning of period	$ 50,595	$ 46,941
Incurred deferred costs	13,427	12,721
Amortized deferred costs	(12,482)	(12,726)
Balance, end of period	$ 51,540	$ 46,936

Stock-Based Compensation

3 Months Ended

Mar. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

NOTE J – Stock-Based Compensation

Our equity compensation plans provide for the grant of incentive and nonqualified stock options, as well as other stock-based awards including performance share units (“PSUs”), restricted stock awards (“RSAs”), restricted stock units (“RSUs”), and deferred stock units (“DSUs”). We also have an employee stock purchase plan (“ESPP”). We recognize stock-based compensation expense based on grant date award fair value. This cost is recognized over the period for which the employee is required to provide service in exchange for the award or the award performance period, except for expense relating to retirement-eligible employees that have not given their required notice, which is recognized on a pro-rata basis over the notice period prior to retirement. At March 31, 2021, there were 13.6 million shares available for grant under approved equity compensation plans.

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

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Cost of revenues	$	1,503	$	808
Operating expenses
Sales and marketing		1,482		846
Research and development		911		923
General and administrative		3,029		1,767
	$	6,925	$	4,344

Stock-based compensation expense by plan type was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Stock options	$	551	$	594
PSUs		2,084		696
RSUs		3,423		2,329
RSAs		106		127
ESPP		326		222
401(k) stock match		435		376
	$	6,925	$	4,344

As of March 31, 2021, there was $40.6 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

Our stock option activity was as follows:

	Three Months Ended March 31, 2021
				Weighted Average
	Options (#)			Exercise Price (per share)
Outstanding, beginning of period		944,886		$	36.71
Granted		34,395			110.42
Exercised		(87,658	)		31.97
Forfeited		(1,560	)		51.57
Outstanding, end of period		890,063			40.00

Of the total outstanding options at March 31, 2021, 0.7 million were exercisable. The outstanding and exercisable options had a weighted average exercise price of $33.82 per share and a weighted average remaining contractual life of 3.4 years.

The weighted average grant date fair value of options granted during the first three months of 2021 was $31.16 per share. This was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:

Volatility	35.3	%
Dividend yield	0	%
Life (in years)	4.0
Risk-free interest rate	0.4	%

Performance Share Units, Restricted Stock Units and Awards, and Deferred Stock Units

In each of the quarters ended March 31, 2021, 2020, 2019, and 2018 we granted PSU awards with a target performance level. These awards are earned based upon the Company’s total shareholder return as compared to an indexed total shareholder return over the course of a fiscal based three-year performance period, starting in the year of grant. Awards vest in the quarter following the conclusion of the performance period. In the three months ended March 31, 2021, PSU awards granted in 2018 vested at the maximum performance level and 0.1 million shares of common stock were issued.

Our PSU, RSU, RSA, and DSU activity was as follows:

	Three Months Ended March 31, 2021
				Weighted Average Grant
	#			Date Fair Value (per unit)
Outstanding, beginning of period		738,422		$	52.37
Granted		236,504			99.10
Vested and common stock issued		(286,888	)		38.58
Forfeited		(6,077	)		54.98
Outstanding, end of period		681,961			74.36

Employee Stock Purchase Plan

Our ESPP activity was as follows:

	Three Months Ended
	March 31,
(In thousands, except share data)	2021		2020
Amounts for shares purchased	$	105	$	87
Shares purchased		1,621		2,015

A total of 1.9 million shares of common stock are reserved for issuance under the ESPP as of March 31, 2021.

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	58.7	%
Dividend yield	0	%
Life (in years)	0.5
Risk-free interest rate	0.2	%

Revenue - Additional Information (Detail)	3 Months Ended
Revenue - Additional Information (Detail)	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
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

Other Assets

3 Months Ended

Mar. 31, 2021

Other Assets [Abstract]

Other Assets

NOTE G – Other Assets

The changes in the net amount of capitalized implementation costs for software hosting arrangements was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021			2020
Balance, beginning of period	$	1,181		$	1,166
Capitalized implementation fees		46			51
Amortization of implementation fees		(57	)		(29	)
Balance, end of period	$	1,170		$	1,188

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2021

Commitments And Contingencies Disclosure [Abstract]

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

We are obligated under non-cancellable operating leases, primarily for office space, as follows:

	March 31, 2021				December 31, 2020
(In thousands, except remaining term)	Remaining Term (years)		Right-of-Use Asset		Remaining Term (years)		Right-of-Use Asset
Minneapolis, MN lease		6	$	11,095		6	$	10,992
Kyiv, Ukraine lease		4		1,832		4		1,930
Other leases	<1 - 5			2,369	<1 - 5			2,659
			$	15,296			$	15,581

Components of Lease Expense

The components of lease expense were as follows:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Operating lease cost	$	540	$	595
Variable lease cost		768		892
	$	1,308	$	1,487

Schedule of Supplemental Cash Flow Information Related to Leases

Supplemental cash flow information related to leases was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases		521		1,112
ROU assets obtained in exchange for operating lease liabilities		—		29

Schedule of Supplemental Balance Sheet Information Related to Leases

Supplemental balance sheet information related to leases was as follows:

	March 31, 2021			December 31, 2020
Weighted-average remaining lease term - operating leases	5.4 years			5.6 years
Weighted-average discount rate - operating leases		4.1	%		4.1	%

Schedule of Future Minimum Payments Under Operating Leases

At March 31, 2021, our future minimum payments under operating leases were as follows:

(In thousands)
Remainder of 2021	$	3,149
2022		4,695
2023		4,427
2024		4,067
2025		3,715
Thereafter		4,850
		24,903
Less: imputed interest		(2,736	)
	$	22,167

Other Assets - Summary of Changes in Net Amount of Capitalized Implementation Costs for Software Hosting Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Capitalized Computer Software Net [Abstract]
Balance, beginning of period	$ 1,181	$ 1,166
Capitalized implementation fees	46	51
Amortization of implementation fees	(57)	(29)
Balance, end of period	$ 1,170	$ 1,188

Financial Instruments

3 Months Ended

Mar. 31, 2021

Disclosure Text Block Supplement [Abstract]

Financial Instruments

NOTE D – Financial Instruments

We invest primarily in money market funds, certificates of deposit, highly liquid debt instruments of the United States (“U.S.”) government and U.S. corporate debt securities. All investments with remaining maturities of 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. 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 condensed consolidated balance sheets. Realized gains or losses are included in other expense, net in the condensed consolidated statements of comprehensive income. Certain securities accrue interest that is included in other expense, net. The unrealized gains (losses) noted below are exclusive of previously recognized interest income. When a determination has been made that the fair value of a marketable security is below its amortized cost basis, the portion of the unrealized loss that corresponds to a credit-related factor is realized through a credit allowance on the marketable security and the equivalent expense is realized in other expense, net in the condensed consolidated statements of comprehensive income.

Cash equivalents and investments consisted of the following:

	March 31, 2021							December 31, 2020
(In thousands)	Amortized Cost		Unrealized Gains (Losses), net			Fair Value		Amortized Cost		Unrealized Losses, net			Fair Value
Cash equivalents:
Money market funds	$	118,485	$	—		$	118,485	$	112,907	$	—		$	112,907
Certificates of deposit		7,618		—			7,618		7,708		—			7,708
Marketable securities:
Corporate bonds		7,564		(40	)		7,524		5,069		(29	)		5,040
Commercial paper		2,493		7			2,500		7,569		(55	)		7,514
U.S. treasury securities		24,094		(62	)		24,032		20,051		(27	)		20,024
	$	160,254	$	(95	)	$	160,159	$	153,304	$	(111	)	$	153,193
Maturing within one year						$	157,659						$	150,693
Maturing within one to two years							2,500							2,500
Total						$	160,159						$	153,193

Recurring 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.

We obtain the fair values of our Level 2 available-for-sale securities from a professional pricing service.

For the contingent consideration liability, related to the Data Masons acquisition, we are required to pay the former owners of Data Masons $1.9 million in the event the Paycheck Protection Program (“PPP”) Loan (“PPP Loan”) acquired in the acquisition is forgiven in full. In November 2020, Data Masons applied for full forgiveness of the PPP Loan. At March 31, 2021, although unknown, we determined that it is probable that Data Masons’ use of the PPP Loan proceeds will meet the conditions for full forgiveness under the PPP. Subsequent to March 31, 2021, the Small Business Administration approved the full forgiveness of the PPP Loan and as such, the payment of the $1.9 million contingent liability is anticipated to be made in the three months ending June 30, 2021.

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

	March 31, 2021								December 31, 2020
(In thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	118,485	$	—	$	—	$	118,485	$	112,907	$	—	$	—	$	112,907
Certificates of deposit		7,618		—		—		7,618		7,708		—		—		7,708
Marketable securities:
Corporate bonds		—		7,524		—		7,524		—		5,040		—		5,040
Commercial paper		—		2,500		—		2,500		—		7,514		—		7,514
U.S. treasury securities		—		24,032		—		24,032		—		20,024		—		20,024
	$	126,103	$	34,056	$	—	$	160,159	$	120,615	$	32,578	$	—	$	153,193

Liabilities:
Contingent consideration	$	—	$	—	$	1,878	$	1,878	$	—	$	—	$	1,878	$	1,878
	$	—	$	—	$	1,878	$	1,878	$	—	$	—	$	1,878	$	1,878

There were no transfers in or out of our Level 1, 2, or 3 assets or liabilities during the three months ended March 31, 2021.

Nonrecurring Fair Value Measurements

We measure certain assets and liabilities at fair value on a nonrecurring basis. Assets that are measured at fair value on a nonrecurring basis include long-lived assets, goodwill, and indefinite-lived intangible assets, which would generally be recorded at fair value as a result of an impairment charge. Assets acquired and liabilities assumed as part of business combinations are measured at fair value.

Other Fair Value Disclosures

The carrying amounts of our short-term financial instruments, including cash and cash equivalents, accounts receivable, and accounts payable, when applicable, approximate their respective fair values due to their short-term nature.

Other Income and Expense (Tables)

3 Months Ended

Mar. 31, 2021

Other Income And Expenses [Abstract]

Summary of Other Expense, Net

Other expense, net included the following:

	Three Months Ended
	March 31,
(In thousands)	2021			2020
Investment income	$	97		$	640
Realized loss from foreign currency on cash and investments held		(289	)		(1,243	)
Other income (expense), net		(133	)		2
Change in earn-out liability		—			(72	)
	$	(325	)	$	(673	)

Revenue - Summary of Revenues by Revenue Stream (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue Recognition [Line Items]
Revenues	$ 90,094	$ 74,192
Recurring Revenues [Member]
Revenue Recognition [Line Items]
Revenues	82,801	70,038
One-time Revenues [Member]
Revenue Recognition [Line Items]
Revenues	7,293	4,154
Fulfillment [Member] \| Recurring Revenues [Member]
Revenue Recognition [Line Items]
Revenues	71,404	59,103
Analytics [Member] \| Recurring Revenues [Member]
Revenue Recognition [Line Items]
Revenues	10,144	9,736
Other [Member] \| Recurring Revenues [Member]
Revenue Recognition [Line Items]
Revenues	$ 1,253	$ 1,199

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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+ Details

Goodwill and Intangible Assets, net (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Changes in Net Carrying Amount of Goodwill

Goodwill

The changes in the net carrying amount of goodwill was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Balance, beginning of period	$	134,853	$	76,845
Remeasurement from provisional purchase accounting amount		268		—
Foreign currency translation adjustments		142		(2,382	)
Balance, end of period	$	135,263	$	74,463

Intangible Assets

Intangible assets subject to amortization are amortized over their respective useful lives (ranging from three to ten years). Intangible assets, net included the following:

	March 31, 2021
	Gross					Foreign
	Carrying		Accumulated			Currency
(In thousands)	Amount		Amortization			Translation			Net
Subscriber relationships	$	54,870	$	(25,808	)	$	(314	)	$	28,748
Non-competition agreements		708		(708	)		—			—
Acquired technology		33,216		(4,370	)		—			28,846
	$	88,794	$	(30,886	)	$	(314	)	$	57,594

	December 31, 2020
	Gross					Foreign
	Carrying		Accumulated			Currency
(In thousands)	Amount		Amortization			Translation			Net
Subscriber relationships	$	54,447	$	(24,792	)	$	101		$	29,756
Non-competition agreements		698		(691	)		(4	)		3
Acquired technology		33,195		(2,724	)		—			30,471
	$	88,340	$	(28,207	)	$	97		$	60,230

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 2021	$	7,287
2022		8,848
2023		8,769
2024		7,476
2025		7,337
Thereafter		17,877
	$	57,594

Net Income Per Share - Schedule of Anti-dilutive Common Shares Excluded from Calculation of Diluted Net Income Per Share (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Income Per Share [Abstract]
Antidilutive shares	56	309

Deferred Costs

3 Months Ended

Mar. 31, 2021

Deferred Costs [Abstract]

Deferred Costs

NOTE C – Deferred Costs

The deferred costs and amortization of deferred costs activity was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021			2020
Balance, beginning of period	$	50,595		$	46,941
Incurred deferred costs		13,427			12,721
Amortized deferred costs		(12,482	)		(12,726	)
Balance, end of period	$	51,540		$	46,936

General (Policies)	3 Months Ended
General (Policies)	Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Business Description	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. For many businesses, implementing and maintaining a suite of supply chain management capabilities is resource-intensive and not a core competency. 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. These solutions also enable 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, helping ensure that suppliers, grocers, distributors, and logistics firms can satisfy retailer requirements.
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of SPS Commerce, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in the condensed consolidated financial statements. This interim financial information has been prepared under 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 included in our Annual Report on Form 10-K for the year ended December 31, 2020, as filed with the Securities and Exchange Commission (“SEC”).
Business Combinations	Business Combinations In December 2020, we acquired all of the outstanding equity ownership interests of D Masons Software, LLC (“Data Masons”). As of December 31, 2020 and March 31, 2021, the purchase accounting for the acquisition is not finalized. Provisional amounts are primarily related to intangible assets, net working capital, and tax positions. We expect to finalize the allocation of the purchase price within the one-year measurement period following the acquisition. During the three months ended March 31, 2021, the only change in the purchase accounting was a $0.3 million reduction of amounts due from the seller as part of the initial net working capital adjustment and a corresponding increase to goodwill. Subsequent to March 31, 2021, the net working capital amount was finalized without change from the amounts recorded at March 31, 2021.
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, 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.
Recently Issued and Adopted Accounting Pronouncements	Recently Issued and Adopted Accounting Pronouncements For the three months ended March 31, 2021, there were no newly adopted accounting pronouncements. As of March 31, 2021, there are no recently issued but not yet adopted accounting pronouncements that are expected to materially impact our consolidated financial statements.
Significant Accounting Policies	Significant Accounting Policies There were no material changes in our significant accounting policies during the three months ended March 31, 2021. See Note A to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2020, as filed with the SEC, for additional information regarding our significant accounting policies.

Geographic Information - Additional Information (Detail) - jurisdiction	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Number of jurisdiction outside US had excess revenue of 10%	0
Geographic Concentration Risk \| United States [Member]
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage	84.00%	85.00%
Geographic Concentration Risk \| Foreign [Member] \| Property, Plant and Equipment
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage	15.00%	8.00%
Geographic Concentration Risk \| Foreign [Member] \| Maximum [Member]
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage	10.00%

Stock-Based Compensation - Weighted Average Grant Date Fair Value of Options Granted, Assumptions (Detail) - Stock Options [Member]	3 Months Ended
	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	35.30%
Dividend yield	0.00%
Life (in years)	4 years
Risk-free interest rate	0.40%

Financial Instruments - Summary of Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Financial Instruments [Line Items]
Maturing within one year	$ 157,659	$ 150,693
Maturing within one to two years	2,500	2,500
Amortized Cost	160,254	153,304
Unrealized Gains (Losses), net	(95)	(111)
Fair Value	160,159	153,193
Money Market Funds [Member]
Schedule of Financial Instruments [Line Items]
Amortized Cost	118,485	112,907
Fair Value	118,485	112,907
Certificates of Deposit [Member]
Schedule of Financial Instruments [Line Items]
Amortized Cost	7,618	7,708
Fair Value	7,618	7,708
Corporate Bonds [Member]
Schedule of Financial Instruments [Line Items]
Amortized Cost	7,564	5,069
Unrealized Gains (Losses), net	(40)	(29)
Fair Value	7,524	5,040
Commercial Paper [Member]
Schedule of Financial Instruments [Line Items]
Amortized Cost	2,493	7,569
Unrealized Gains (Losses), net	7	(55)
Fair Value	2,500	7,514
U.S. Treasury Securities [Member]
Schedule of Financial Instruments [Line Items]
Amortized Cost	24,094	20,051
Unrealized Gains (Losses), net	(62)	(27)
Fair Value	$ 24,032	$ 20,024

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash and cash equivalents	$ 169,274	$ 149,692
Short-term investments	39,174	37,786
Accounts receivable	39,271	37,811
Allowance for credit losses	(4,001)	(4,233)
Accounts receivable, net	35,270	33,578
Deferred costs	38,666	37,988
Other assets	14,490	12,312
Total current assets	296,874	271,356
PROPERTY AND EQUIPMENT, less accumulated depreciation of $62,947 and $59,152, respectively	26,606	26,432
OPERATING LEASE RIGHT-OF-USE ASSETS	15,296	15,581
GOODWILL	135,263	134,853
INTANGIBLE ASSETS, net	57,594	60,230
INVESTMENTS	2,500	2,500
OTHER ASSETS
Deferred costs, non-current	12,874	12,607
Deferred income tax assets	210	194
Other assets, non-current	2,620	2,705
Total assets	549,837	526,458
CURRENT LIABILITIES
Accounts payable	5,081	5,354
Accrued compensation	20,428	22,872
Accrued expenses	10,018	11,161
Deferred revenue	44,481	37,947
Operating lease liabilities	3,424	2,798
Total current liabilities	83,432	80,132
OTHER LIABILITIES
Deferred revenue, non-current	4,027	2,996
Operating lease liabilities, non-current	18,743	19,672
Deferred income tax liabilities	3,112	2,937
Total liabilities	109,314	105,737
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; 110,000,000 shares authorized; 37,474,834 and 37,100,467 shares issued; and 35,861,584 and 35,487,217 outstanding, respectively	37	37
Treasury stock, at cost; 1,613,250 shares	(65,247)	(65,247)
Additional paid-in capital	402,860	393,462
Retained earnings	103,690	93,490
Accumulated other comprehensive loss	(817)	(1,021)
Total stockholders’ equity	440,523	420,721
Total liabilities and stockholders’ equity	$ 549,837	$ 526,458

Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value, assets, level 1 to level 2 transfers, amount		$ 0
Fair value, assets, level 2 to level 1 transfers, amount		0
Fair value, liabilities, level 1 to level 2 transfers, amount		0
Fair value, liabilities, level 2 to level 1 transfers, amount		0
Fair value, asset transfers into level 3		0
Fair value, asset, transfers out of level 3		0
Fair value, liability, transfers into level 3		0
Fair value, liability, transfers out of level 3		0
Data Masons [Member] \| PPP Loan [Member] \| Former Owners [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liability		$ 1,900,000
Data Masons [Member] \| PPP Loan [Member] \| Former Owners [Member] \| Scenario Forecast [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Payment contingent consideration liability	$ 1,900,000

General - Additional Information (Detail) $ in Millions	Mar. 31, 2021 USD ($)
Data Masons [Member]
Schedule Of Accounting Policies [Line Items]
Business combination due from sellers related within initial net working capital adjustment	$ 0.3

Commitments and Contingencies - Schedule of Future Minimum Payments Under Operating Leases (Detail) $ in Thousands	Mar. 31, 2021 USD ($)
Leases [Abstract]
Remainder of 2021	$ 3,149
2022	4,695
2023	4,427
2024	4,067
2025	3,715
Thereafter	4,850
Future minimum payments	24,903
Less: imputed interest	(2,736)
Operating lease liability	$ 22,167

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 6,925	$ 4,344
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	551	594
PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	2,084	696
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	3,423	2,329
RSAs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	106	127
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	326	222
401(k) Stock Match [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	435	376
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	1,503	808
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	1,482	846
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	911	923
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 3,029	$ 1,767

Net Income Per Share

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Net Income Per Share

NOTE M – 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, PSUs, RSUs, RSAs, and DSUs. 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:

	Three Months Ended
	March 31,
(In thousands, except per share amounts)	2021		2020
Numerator
Net income	$	10,200	$	9,515
Denominator
Weighted average common shares outstanding, basic		35,751		35,072
Options to purchase common stock		568		582
PSUs, RSUs, RSAs, and DSUs		403		272
Weighted average common shares outstanding, diluted		36,722		35,926
Net income per share
Basic	$	0.29	$	0.27
Diluted	$	0.28	$	0.26

The following table presents the effect of the outstanding potential common shares that were excluded from the calculation of diluted net income per share as they were anti-dilutive:

	Three Months Ended
	March 31,
(in thousands)	2021	2020
Antidilutive shares	56	309

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Unrealized gain (loss) on investments, tax	$ (15)	$ 24
Reclassification of (gain) loss on investments into earnings, tax	$ 19	$ (26)

Goodwill and Intangible Assets, net - Schedule of Changes in Net Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Balance, beginning of period	$ 134,853	$ 76,845
Remeasurement from provisional purchase accounting amount	268
Foreign currency translation adjustments	142	(2,382)
Balance, end of period	$ 135,263	$ 74,463

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Accumulated depreciation	$ 62,947	$ 59,152
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	110,000,000	110,000,000
Common stock, shares issued	37,474,834	37,100,467
Common stock, shares outstanding	35,861,584	35,487,217
Treasury stock, shares	1,613,250	1,613,250

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2021	Apr. 23, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Trading Symbol	SPSC
Entity Registrant Name	SPS COMMERCE, INC.
Entity Central Index Key	0001092699
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		35,863,210
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity File Number	001-34702
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	41-2015127
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
Title of 12(b) Security	Common Stock, par value $0.001 per share
Security Exchange Name	NASDAQ
Document Quarterly Report	true
Document Transition Report	false

Commitments and Contingencies - Schedule of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 521	$ 1,112
ROU assets obtained in exchange for operating lease liabilities		$ 29

Goodwill and Intangible Assets, net

3 Months Ended

Mar. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, net

NOTE F – Goodwill and Intangible Assets, net

Goodwill

The changes in the net carrying amount of goodwill was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Balance, beginning of period	$	134,853	$	76,845
Remeasurement from provisional purchase accounting amount		268		—
Foreign currency translation adjustments		142		(2,382	)
Balance, end of period	$	135,263	$	74,463

Intangible Assets

Intangible assets subject to amortization are amortized over their respective useful lives (ranging from three to ten years). Intangible assets, net included the following:

	March 31, 2021
	Gross					Foreign
	Carrying		Accumulated			Currency
(In thousands)	Amount		Amortization			Translation			Net
Subscriber relationships	$	54,870	$	(25,808	)	$	(314	)	$	28,748
Non-competition agreements		708		(708	)		—			—
Acquired technology		33,216		(4,370	)		—			28,846
	$	88,794	$	(30,886	)	$	(314	)	$	57,594

	December 31, 2020
	Gross					Foreign
	Carrying		Accumulated			Currency
(In thousands)	Amount		Amortization			Translation			Net
Subscriber relationships	$	54,447	$	(24,792	)	$	101		$	29,756
Non-competition agreements		698		(691	)		(4	)		3
Acquired technology		33,195		(2,724	)		—			30,471
	$	88,340	$	(28,207	)	$	97		$	60,230

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

(In thousands)
Remainder of 2021	$	7,287
2022		8,848
2023		8,769
2024		7,476
2025		7,337
Thereafter		17,877
	$	57,594

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Stock-Based Compensation Expense

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

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Cost of revenues	$	1,503	$	808
Operating expenses
Sales and marketing		1,482		846
Research and development		911		923
General and administrative		3,029		1,767
	$	6,925	$	4,344

Stock-based compensation expense by plan type was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Stock options	$	551	$	594
PSUs		2,084		696
RSUs		3,423		2,329
RSAs		106		127
ESPP		326		222
401(k) stock match		435		376
	$	6,925	$	4,344

Stock Option Activity

Our stock option activity was as follows:

	Three Months Ended March 31, 2021
				Weighted Average
	Options (#)			Exercise Price (per share)
Outstanding, beginning of period		944,886		$	36.71
Granted		34,395			110.42
Exercised		(87,658	)		31.97
Forfeited		(1,560	)		51.57
Outstanding, end of period		890,063			40.00

Weighted Average Grant Date Fair Value of Options Granted, Assumptions

Volatility	35.3	%
Dividend yield	0	%
Life (in years)	4.0
Risk-free interest rate	0.4	%

Summary of ESPP Activity

Our ESPP activity was as follows:

	Three Months Ended
	March 31,
(In thousands, except share data)	2021		2020
Amounts for shares purchased	$	105	$	87
Shares purchased		1,621		2,015

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	58.7	%
Dividend yield	0	%
Life (in years)	0.5
Risk-free interest rate	0.2	%

PSU, RSU, RSA, and DSU [Member]

PSU, RSU, RSA, and DSU

Our PSU, RSU, RSA, and DSU activity was as follows:

	Three Months Ended March 31, 2021
				Weighted Average Grant
	#			Date Fair Value (per unit)
Outstanding, beginning of period		738,422		$	52.37
Granted		236,504			99.10
Vested and common stock issued		(286,888	)		38.58
Forfeited		(6,077	)		54.98
Outstanding, end of period		681,961			74.36

Stockholders' Equity

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Stockholders’ Equity

NOTE I – Stockholders’ Equity

Stock Repurchase Program

On November 2, 2019, our board of directors authorized a program to repurchase up to $50 million of common stock. Under the program, purchases may be made from time to time in the open market over two years. For the three months ended March 31, 2021, we did not repurchase any shares. As of March 31, 2021, $31.1 million of the share repurchase program was available for future share repurchases.

Commitments and Contingencies - Schedule of Supplemental Balance Sheet Information Related to Leases (Detail)	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Weighted-average remaining lease term - operating leases	5 years 4 months 24 days	5 years 7 months 6 days
Weighted-average discount rate - operating leases	4.10%	4.10%

Income Taxes - Additional Information (Detail)	Mar. 31, 2021 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 0
Accrued interest or tax penalties	$ 0

Allowance for Credit Losses (Tables)

3 Months Ended

Mar. 31, 2021

Receivables [Abstract]

Schedule of Allowance for Credit Losses Activity Included in Accounts Receivable Net

The allowance for credit losses activity, included in accounts receivable, net, was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021			2020
Balance, beginning of period	$	4,233		$	1,469
Adoption of ASU 2016-13		—			1,069
Provision for credit losses		1,205			1,285
Write-offs, net of recoveries		(1,437	)		(884	)
Balance, end of period	$	4,001		$	2,939

Other Income and Expense

3 Months Ended

Mar. 31, 2021

Other Income And Expenses [Abstract]

Other Income and Expense

NOTE L – Other Income and Expense

Other expense, net included the following:

	Three Months Ended
	March 31,
(In thousands)	2021			2020
Investment income	$	97		$	640
Realized loss from foreign currency on cash and investments held		(289	)		(1,243	)
Other income (expense), net		(133	)		2
Change in earn-out liability		—			(72	)
	$	(325	)	$	(673	)

Effective January 1, 2021, all realized gains or losses and interest income on our investments are included in investment income. Previously, realized gains and losses were included in other income (expense), net and interest income was included in interest income, net. Additionally, realized gains or losses from foreign currency on cash and investments held were previously included in other income (expense), net. Amounts for the three months ended March 31, 2020 have been reclassified to be consistent with the classifications for the three months ended March 31, 2021.

Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2021

Financial Instruments Owned At Fair Value [Abstract]

Summary of Cash Equivalents and Investments

Cash equivalents and investments consisted of the following:

	March 31, 2021							December 31, 2020
(In thousands)	Amortized Cost		Unrealized Gains (Losses), net			Fair Value		Amortized Cost		Unrealized Losses, net			Fair Value
Cash equivalents:
Money market funds	$	118,485	$	—		$	118,485	$	112,907	$	—		$	112,907
Certificates of deposit		7,618		—			7,618		7,708		—			7,708
Marketable securities:
Corporate bonds		7,564		(40	)		7,524		5,069		(29	)		5,040
Commercial paper		2,493		7			2,500		7,569		(55	)		7,514
U.S. treasury securities		24,094		(62	)		24,032		20,051		(27	)		20,024
	$	160,254	$	(95	)	$	160,159	$	153,304	$	(111	)	$	153,193
Maturing within one year						$	157,659						$	150,693
Maturing within one to two years							2,500							2,500
Total						$	160,159						$	153,193

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

	March 31, 2021								December 31, 2020
(In thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	118,485	$	—	$	—	$	118,485	$	112,907	$	—	$	—	$	112,907
Certificates of deposit		7,618		—		—		7,618		7,708		—		—		7,708
Marketable securities:
Corporate bonds		—		7,524		—		7,524		—		5,040		—		5,040
Commercial paper		—		2,500		—		2,500		—		7,514		—		7,514
U.S. treasury securities		—		24,032		—		24,032		—		20,024		—		20,024
	$	126,103	$	34,056	$	—	$	160,159	$	120,615	$	32,578	$	—	$	153,193

Liabilities:
Contingent consideration	$	—	$	—	$	1,878	$	1,878	$	—	$	—	$	1,878	$	1,878
	$	—	$	—	$	1,878	$	1,878	$	—	$	—	$	1,878	$	1,878

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenues	$ 90,094	$ 74,192
Cost of revenues	29,970	23,544
Gross profit	60,124	50,648
Operating expenses
Sales and marketing	21,355	18,299
Research and development	8,706	7,568
General and administrative	14,737	11,909
Amortization of intangible assets	2,664	1,336
Total operating expenses	47,462	39,112
Income from operations	12,662	11,536
Other expense, net	(325)	(673)
Income before income taxes	12,337	10,863
Income tax expense	2,137	1,348
Net income	10,200	9,515
Other comprehensive income (expense)
Foreign currency translation adjustments	192	(3,864)
Unrealized gain (loss) on investments, net of tax of ($15) and $24	(45)	71
Reclassification of (gain) loss on investments into earnings, net of tax of $19 and ($26)	57	(79)
Total other comprehensive income (expense)	204	(3,872)
Comprehensive income	$ 10,404	$ 5,643
Net income per share
Basic	$ 0.29	$ 0.27
Diluted	$ 0.28	$ 0.26
Weighted average common shares used to compute net income per share
Basic	35,751	35,072
Diluted	36,722	35,926

Other Income and Expense - Summary of Other Expense, Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income And Expenses [Abstract]
Investment income	$ 97	$ 640
Realized loss from foreign currency on cash and investments held	(289)	(1,243)
Other income (expense), net	(133)	2
Change in earn-out liability		(72)
Total other income (expense), net	$ (325)	$ (673)

Stock-Based Compensation - Stock Option Activity (Detail)	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, Beginning balance \| shares	944,886
Options, Granted \| shares	34,395
Options, Exercised \| shares	(87,658)
Options, Forfeited \| shares	(1,560)
Options Outstanding, Ending balance \| shares	890,063
Weighted Average Exercise Price, Outstanding, Beginning Balance \| $ / shares	$ 36.71
Weighted Average Exercise Price, Granted \| $ / shares	110.42
Weighted Average Exercise Price, Exercised \| $ / shares	31.97
Weighted Average Exercise Price, Forfeited \| $ / shares	51.57
Weighted Average Exercise Price, Outstanding, Ending Balance \| $ / shares	$ 40.00

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income	$ 10,200	$ 9,515
Reconciliation of net income to net cash provided by operating activities
Deferred income taxes	163	668
Change in earn-out liability		72
Depreciation and amortization of property and equipment	3,765	3,138
Amortization of intangible assets	2,664	1,336
Provision for credit losses	1,205	1,285
Stock-based compensation	6,925	4,344
Other, net	76	(105)
Changes in assets and liabilities
Accounts receivable	(2,828)	(1,053)
Deferred costs	(986)	(256)
Other current and non-current assets	(2,257)	2,041
Accounts payable	(828)	655
Accrued compensation	(2,988)	(9,302)
Accrued expenses	(1,052)	(615)
Deferred revenue	7,565	3,396
Operating leases	(19)	(452)
Net cash provided by operating activities	21,605	14,667
Cash flows from investing activities
Purchases of property and equipment	(3,263)	(3,965)
Purchases of investments	(14,039)	(12,460)
Maturities of investments	12,500	15,875
Net cash used in investing activities	(4,802)	(550)
Cash flows from financing activities
Repurchases of common stock		(12,000)
Net proceeds from exercise of options to purchase common stock	2,802	3,683
Net proceeds from employee stock purchase plan	105	87
Payment for earn-out liability	(164)	(688)
Net cash provided by (used in) financing activities	2,743	(8,918)
Effect of foreign currency exchange rate changes	36	33
Net increase in cash and cash equivalents	19,582	5,232
Cash and cash equivalents at beginning of period	149,692	179,252
Cash and cash equivalents at end of period	$ 169,274	$ 184,484

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Mar. 31, 2021 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Lease extension period, number of years	5 years
Remaining purchase commitment	$ 16.2

Allowance for Credit Losses - Schedule of Allowance for Credit Losses Activity Included in Accounts Receivable Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Allowance For Credit Loss [Abstract]
Balance, beginning of period	$ 4,233	$ 1,469
Adoption of ASU 2016-13		1,069
Provision for credit losses	1,205	1,285
Write-offs, net of recoveries	(1,437)	(884)
Balance, end of period	$ 4,001	$ 2,939

Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended
	Nov. 02, 2019	Mar. 31, 2021	Mar. 31, 2020
Stock Repurchase Program [Member]
Schedule Of Stockholders Equity [Line Items]
Stock repurchase program, repurchased in shares		0
Common Stock [Member]
Schedule Of Stockholders Equity [Line Items]
Stock repurchase program, authorized amount	$ 50.0
Stock repurchase program, period	2 years
Stock repurchase program, repurchased in shares			240,275
Stock repurchase program, available for future repurchases		$ 31.1

Allowance for Credit Losses

3 Months Ended

Mar. 31, 2021

Receivables [Abstract]

Allowance for Credit Losses

NOTE E – Allowance for Credit Losses

The allowance for credit losses activity, included in accounts receivable, net, was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021			2020
Balance, beginning of period	$	4,233		$	1,469
Adoption of ASU 2016-13		—			1,069
Provision for credit losses		1,205			1,285
Write-offs, net of recoveries		(1,437	)		(884	)
Balance, end of period	$	4,001		$	2,939

General

3 Months Ended

Mar. 31, 2021

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. For many businesses, implementing and maintaining a suite of supply chain management capabilities is resource-intensive and not a core competency. 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. These solutions also enable 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, helping ensure that suppliers, grocers, distributors, and logistics firms can satisfy retailer requirements.

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of SPS Commerce, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in the condensed consolidated financial statements.

This interim financial information has been prepared under 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 included in our Annual Report on Form 10-K for the year ended December 31, 2020, as filed with the Securities and Exchange Commission (“SEC”).

Business Combinations

In December 2020, we acquired all of the outstanding equity ownership interests of D Masons Software, LLC (“Data Masons”). As of December 31, 2020 and March 31, 2021, the purchase accounting for the acquisition is not finalized. Provisional amounts are primarily related to intangible assets, net working capital, and tax positions. We expect to finalize the allocation of the purchase price within the one-year measurement period following the acquisition. During the three months ended March 31, 2021, the only change in the purchase accounting was a $0.3 million reduction of amounts due from the seller as part of the initial net working capital adjustment and a corresponding increase to goodwill. Subsequent to March 31, 2021, the net working capital amount was finalized without change from the amounts recorded at March 31, 2021.

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.

Recently Issued and Adopted Accounting Pronouncements

For the three months ended March 31, 2021, there were no newly adopted accounting pronouncements. As of March 31, 2021, there are no recently issued but not yet adopted accounting pronouncements that are expected to materially impact our consolidated financial statements.

Significant Accounting Policies

There were no material changes in our significant accounting policies during the three months ended March 31, 2021. See Note A to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2020, as filed with the SEC, for additional information regarding our significant accounting policies.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE H – Commitments and Contingencies

Leases

We are obligated under non-cancellable operating leases, primarily for office space, as follows:

	March 31, 2021				December 31, 2020
(In thousands, except remaining term)	Remaining Term (years)		Right-of-Use Asset		Remaining Term (years)		Right-of-Use Asset
Minneapolis, MN lease		6	$	11,095		6	$	10,992
Kyiv, Ukraine lease		4		1,832		4		1,930
Other leases	<1 - 5			2,369	<1 - 5			2,659
			$	15,296			$	15,581

Some of our leases may include options to extend the leases for up to five years. The options to extend our leases are not recognized as part of our Right-of-Use (“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.

The components of lease expense were as follows:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Operating lease cost	$	540	$	595
Variable lease cost		768		892
	$	1,308	$	1,487

Supplemental cash flow information related to leases was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases		521		1,112
ROU assets obtained in exchange for operating lease liabilities		—		29

Supplemental balance sheet information related to leases was as follows:

	March 31, 2021			December 31, 2020
Weighted-average remaining lease term - operating leases	5.4 years			5.6 years
Weighted-average discount rate - operating leases		4.1	%		4.1	%

At March 31, 2021, our future minimum payments under operating leases were as follows:

(In thousands)
Remainder of 2021	$	3,149
2022		4,695
2023		4,427
2024		4,067
2025		3,715
Thereafter		4,850
		24,903
Less: imputed interest		(2,736	)
	$	22,167

Purchase Commitments

We have entered into separate noncancelable agreements with computing infrastructure and customer relationship management vendors for services through 2023. At March 31, 2021, the total remaining purchase commitments were $16.2 million.

Revenue

3 Months Ended

Mar. 31, 2021

Revenue From Contract With Customer [Abstract]

Revenue

NOTE B – Revenue

We derive our revenues from the following revenue streams:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Recurring revenues:
Fulfillment	$	71,404	$	59,103
Analytics		10,144		9,736
Other		1,253		1,199
Recurring Revenues		82,801		70,038
One-time revenues		7,293		4,154
	$	90,094	$	74,192

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 consist 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 to 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.

Certain contracts contain set-up fees that constitute a material renewal option right. This material right provides customers a significant future incentive that would not otherwise be available to them unless they entered into the contract, as the set-up fees will not be incurred again upon contract renewal.

For our Fulfillment solution, we have determined that the set-up fees and related costs 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 period for which a material right is present for our customers.

For our Analytics solution, we have determined that 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 generally one year.

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

	Three Months Ended
	March 31,
(In thousands)	2021			2020
Balance, beginning of period	$	11,118		$	10,518
Invoiced set-up fees		3,867			2,719
Amortized set-up fees		(2,883	)		(2,665	)
Balance, end of period	$	12,102		$	10,572

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 to not disclose information about the remaining performance obligations for contracts which have original durations of one year or less.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

Stock-Based Compensation - PSU, RSU, RSA, and DSU (Detail) - PSU, RSU, RSA, and DSU [Member]	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, Outstanding, Beginning Balance \| shares	738,422
Granted, stock units \| shares	236,504
Vested and common stock issued, stock units \| shares	(286,888)
Forfeited, stock units \| shares	(6,077)
Stock awards, Outstanding, Ending Balance \| shares	681,961
Weighted average grant date fair value, Outstanding, Beginning Balance \| $ / shares	$ 52.37
Granted, Weighted Average Grant Date Fair Value \| $ / shares	99.10
Vested and common stock issued, Weighted Average Grant Date Fair Value \| $ / shares	38.58
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	54.98
Weighted average grant date fair value, Outstanding, Ending Balance \| $ / shares	$ 74.36

Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	$ 160,159	$ 153,193
Liabilities fair value	1,878	1,878
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	118,485	112,907
Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	7,618	7,708
Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	7,524	5,040
Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	2,500	7,514
U.S. Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	24,032	20,024
Contingent Consideration [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities fair value	1,878	1,878
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	126,103	120,615
Level 1 [Member] \| Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	118,485	112,907
Level 1 [Member] \| Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	7,618	7,708
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	34,056	32,578
Level 2 [Member] \| Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	7,524	5,040
Level 2 [Member] \| Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	2,500	7,514
Level 2 [Member] \| U.S. Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets fair value	24,032	20,024
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities fair value	1,878	1,878
Level 3 [Member] \| Contingent Consideration [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities fair value	$ 1,878	$ 1,878

Commitments and Contingencies - Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease cost	$ 540	$ 595
Variable lease cost	768	892
Lease expense	$ 1,308	$ 1,487

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Revision of Prior Period Accounting Standards Update Adjustment [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Revision of Prior Period Accounting Standards Update Adjustment [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2019	$ 354,876		$ 36	$ (46,297)	$ 354,115	$ 48,973		$ (1,951)
Beginning balance, shares at Dec. 31, 2019			34,863,271	1,241,348
Stock-based compensation	3,968				3,968
Shares issued pursuant to stock awards	3,683				3,683
Shares issued pursuant to stock awards, shares			367,814
Employee stock purchase plan	87				87
Employee stock purchase plan, shares			2,015
Repurchases of common stock	(12,000)			$ (12,000)
Repurchases of common stock, shares			(240,275)	240,275
Net income	9,515					9,515
Foreign currency translation adjustments	(3,864)							(3,864)
Unrealized gain (loss) on investments, net of tax	71							71
Reclassification of gain (loss) on investments into earnings, net of tax	(79)							(79)
Ending balance at Mar. 31, 2020	355,188		$ 36	$ (58,297)	361,853	57,419		(5,823)
Ending balance (ASU 2016-13) at Mar. 31, 2020		$ (1,069)					$ (1,069)
Ending balance, shares at Mar. 31, 2020			34,992,825	1,481,623
Beginning balance at Dec. 31, 2020	420,721		$ 37	$ (65,247)	393,462	93,490		(1,021)
Beginning balance, shares at Dec. 31, 2020			35,487,217	1,613,250
Stock-based compensation	6,491				6,491
Shares issued pursuant to stock awards	2,802				2,802
Shares issued pursuant to stock awards, shares			372,746
Employee stock purchase plan	105				105
Employee stock purchase plan, shares			1,621
Net income	10,200					10,200
Foreign currency translation adjustments	192							192
Unrealized gain (loss) on investments, net of tax	(45)							(45)
Reclassification of gain (loss) on investments into earnings, net of tax	57							57
Ending balance at Mar. 31, 2021	$ 440,523		$ 37	$ (65,247)	$ 402,860	$ 103,690		$ (817)
Ending balance, shares at Mar. 31, 2021			35,861,584	1,613,250

Net Income Per Share - Components of Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator
Net income	$ 10,200	$ 9,515
Denominator
Weighted average common shares outstanding, basic	35,751	35,072
Options to purchase common stock	568	582
PSUs, RSUs, RSAs, and DSUs	403	272
Weighted average common shares outstanding, diluted	36,722	35,926
Net income per share
Basic	$ 0.29	$ 0.27
Diluted	$ 0.28	$ 0.26

Other Assets (Tables)

3 Months Ended

Mar. 31, 2021

Other Assets [Abstract]

Summary of Changes in Net Amount of Capitalized Implementation Costs for Software Hosting Arrangements

The changes in the net amount of capitalized implementation costs for software hosting arrangements was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021			2020
Balance, beginning of period	$	1,181		$	1,166
Capitalized implementation fees		46			51
Amortization of implementation fees		(57	)		(29	)
Balance, end of period	$	1,170		$	1,188

Deferred Costs (Tables)

3 Months Ended

Mar. 31, 2021

Deferred Costs [Abstract]

Summary of Deferred Costs and Amortization of Deferred Costs

The deferred costs and amortization of deferred costs activity was as follows:

	Three Months Ended
	March 31,
(In thousands)	2021			2020
Balance, beginning of period	$	50,595		$	46,941
Incurred deferred costs		13,427			12,721
Amortized deferred costs		(12,482	)		(12,726	)
Balance, end of period	$	51,540		$	46,936

Stock-Based Compensation - Summary of ESPP Activity (Detail) - Employee Stock Purchase Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amounts for shares purchased	$ 105	$ 87
Shares purchased	1,621	2,015

Stock-Based Compensation - Fair Value Estimation of Common Stock Using Black-Scholes Option Pricing Model, Assumptions (Detail) - Employee Stock Purchase Plan [Member]	3 Months Ended
	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	58.70%
Dividend yield	0.00%
Life (in years)	6 months
Risk-free interest rate	0.20%

Goodwill and Intangible Assets, net - Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 88,794	$ 88,340
Accumulated Amortization	(30,886)	(28,207)
Foreign Currency Translation	(314)	97
Net	57,594	60,230
Subscriber Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	54,870	54,447
Accumulated Amortization	(25,808)	(24,792)
Foreign Currency Translation	(314)	101
Net	28,748	29,756
Non-competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	708	698
Accumulated Amortization	(708)	(691)
Foreign Currency Translation		(4)
Net		3
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,216	33,195
Accumulated Amortization	(4,370)	(2,724)
Net	$ 28,846	$ 30,471

Goodwill and Intangible Assets, net - Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2021	$ 7,287
2022	8,848
2023	8,769
2024	7,476
2025	7,337
Thereafter	17,877
Net	$ 57,594	$ 60,230

Income Taxes

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

NOTE K – 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 and tax benefits associated with foreign-derived intangible income. 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 includes current federal, state, and foreign income tax expense, as well as deferred tax expense.

As of March 31, 2021, we did not have any unrecognized tax benefits, accrued interest, or tax penalties.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2021

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:

	Three Months Ended
	March 31,
(In thousands, except per share amounts)	2021		2020
Numerator
Net income	$	10,200	$	9,515
Denominator
Weighted average common shares outstanding, basic		35,751		35,072
Options to purchase common stock		568		582
PSUs, RSUs, RSAs, and DSUs		403		272
Weighted average common shares outstanding, diluted		36,722		35,926
Net income per share
Basic	$	0.29	$	0.27
Diluted	$	0.28	$	0.26

Schedule of Anti-dilutive Common Shares Excluded from Calculation of Diluted Net Income Per Share

The following table presents the effect of the outstanding potential common shares that were excluded from the calculation of diluted net income per share as they were anti-dilutive:

	Three Months Ended
	March 31,
(in thousands)	2021	2020
Antidilutive shares	56	309

Revenue - Summary of Deferred Revenue Liability Relating to Set-Up Fees (Detail) - Set-Up Fees [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Deferred Revenue Arrangement [Line Items]
Balance, beginning of period	$ 11,118	$ 10,518
Invoiced set-up fees	3,867	2,719
Amortized set-up fees	(2,883)	(2,665)
Balance, end of period	$ 12,102	$ 10,572