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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Schedule of Revenue Disaggregated by Revenue Type, Geographic Region and Customer

The nature, amount, timing, and uncertainty of our revenue and how revenue and cash flows are affected by economic factors is most appropriately depicted by revenue type, geographic region, and customer vertical.

Revenue type for 2022, 2021, and 2020 was as follows (in thousands):

		2022				2021				2020
Revenue:
SaaS and related solutions		$	956,995			$	926,290			$	880,822
Software and services			87,247				72,818				63,239
Maintenance			45,510				47,379				46,472
Total revenue		$	1,089,752			$	1,046,487			$	990,533

We use the location of the customer as the basis of attributing revenue to geographic regions. Revenue by geographic region for 2022, 2021, and 2020, as a percentage of our total revenue, was as follows:

		2022				2021				2020
Americas (principally the U.S.)			85	%			85	%			86	%
Europe, Middle East and Africa (principally Europe)			11	%			11	%			10	%
Asia Pacific			4	%			4	%			4	%
Total revenue			100	%			100	%			100	%

We generate our revenue primarily from the global communications markets; however, we serve an expanding group of customers in markets including retail, financial services, healthcare, insurance, and government entities. Revenue by customer vertical for 2022, 2021, and 2020, as a percentage of our total revenue, was as follows:

		2022				2021				2020
Broadband/Cable/Satellite			54	%			57	%			58	%
Telecommunications			20	%			19	%			19	%
Other			26	%			24	%			23	%
Total revenue			100	%			100	%			100	%

Rollforward of Unbilled Accounts Receivable

The following table rolls forward our unbilled accounts receivable from January 1, 2021 to December 31, 2022 (in thousands):

		Unbilled Receivables
Beginning Balance, January 1, 2021		$	37,785
Recognized during the period			252,661
Reclassified to receivables			(254,482	)
Other			(162	)
Ending Balance, December 31, 2021			35,802
Recognized during the period			285,562
Reclassified to receivables			(265,707	)
Other			(2,827	)
Ending Balance, December 31, 2022		$	52,830

Rollforward of Deferred Revenue

The following table rolls forward our deferred revenue from January 1, 2021 to December 31, 2022 (in thousands):

		Deferred Revenue
Beginning Balance, January 1, 2021		$	(69,632	)
Revenue recognized that was included in deferred revenue at the beginning     of the period			49,052
Consideration received in advance of services performed net of revenue     recognized in the current period			(53,084	)
Other			317
Ending Balance, December 31, 2021			(73,347	)
Revenue recognized that was included in deferred revenue at the beginning     of the period			53,947
Consideration received in advance of services performed net of revenue     recognized in the current period			(51,432	)
Other			2,808
Ending Balance, December 31, 2022		$	(68,024	)

Fair Value Measurements

The following table represents the fair value hierarchy based upon three levels of inputs, of which Levels 1 and 2 are considered observable and Level 3 is unobservable, for our financial assets measured at fair value (in thousands):

		December 31, 2022												December 31, 2021
		Level 1				Level 2				Total				Level 1				Level 2				Total
Cash equivalents:
Money market funds		$	5,318			$	—			$	5,318			$	29,305			$	—			$	29,305
Commercial paper			—				—				—				—				1,000				1,000
Short-term investments:
Corporate debt securities			—				—				—				—				24,352				24,352
Asset-backed securities			—				71				71				—				3,685				3,685
Total		$	5,318			$	71			$	5,389			$	29,305			$	29,037			$	58,342

Carrying Value and Estimated Fair Value of Debt

We have chosen not to record our debt at fair value, with changes recognized in earnings each reporting period. The following table indicates the carrying value and estimated fair value of our debt as of the indicated periods (in thousands):

		December 31, 2022								December 31, 2021
		Carrying Value				Fair Value				Carrying Value				Fair Value
2021 Credit Agreement (carrying value including      current maturities) :
Term Loan		$	140,625			$	140,625			$	148,125			$	148,125
Revolver			275,000				275,000				—				—
2016 Convertible Notes (par value)			—				—				230,000				244,950

Schedule of Settlement and Merchant Reserve Assets and Liabilities

The following table summarizes our settlement and merchant reserve assets and liabilities as of the indicated periods (in thousands):

		December 31, 2022								December 31, 2021
		Assets				Liabilities				Assets				Liabilities
Settlement assets/liabilities		$	219,368			$	218,525			$	171,505			$	170,514
Merchant reserve assets/liabilities			19,285				19,285				14,762				14,762
Total		$	238,653			$	237,810			$	186,267			$	185,276

Allowance for Doubtful Accounts Receivable

The activity in our allowance for doubtful accounts receivable is as follows (in thousands):

		2022				2021				2020
Balance, beginning of year		$	4,250			$	3,628			$	3,735
Additions to expense			1,295				1,102				1,481
Write-offs			(8	)			(466	)			(1,532	)
Other			(9	)			(14	)			(56	)
Balance, end of year		$	5,528			$	4,250			$	3,628

Reconciliation of the Basic and Diluted EPS denominators

The reconciliation of the basic and diluted EPS denominators related to the common shares is included in the following table (in thousands):

			2022				2021				2020
Basic weighted-average common shares				31,028				31,776				32,010
Dilutive effect of restricted common stock				270				234			268
Diluted weighted-average common shares				31,298				32,010				32,278

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