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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

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 by type for 2021, 2020, and 2019 was as follows (in thousands):

		2021				2020				2019
Revenue:
SaaS and related solutions		$	926,290			$	880,822			$	896,164
Software and services			72,818				63,239				52,364
Maintenance			47,379				46,472				48,282
Total revenue		$	1,046,487			$	990,533			$	996,810

We use the location of the customer as the basis of attributing revenue to geographic regions. Revenue by geographic region for 2021, 2020, and 2019, as a percentage of our total revenue, was as follows:

		2021				2020				2019
Americas (principally the U.S.)			85	%			86	%			87	%
Europe, Middle East and Africa (principally Europe)			11	%			10	%			9	%
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 2021, 2020, and 2019, as a percentage of our total revenue, was as follows:

		2021				2020				2019
Broadband/Cable/Satellite			57	%			58	%			58	%
Telecommunications			19	%			19	%			19	%
Other			24	%			23	%			23	%
Total revenue			100	%			100	%			100	%

Rollforward of Unbilled Accounts Receivable

The following table rolls forward our unbilled accounts receivable from January 1, 2020 to December 31, 2021 (in thousands):

		Unbilled Receivables
Beginning Balance, January 1, 2020		$	33,450
Recognized during the period			248,574
Reclassified to receivables			(244,574	)
Other			335
Ending Balance, December 31, 2020			37,785
Recognized during the period			252,661
Reclassified to receivables			(254,482	)
Other			(162	)
Ending Balance, December 31, 2021		$	35,802

Rollforward of Deferred Revenue

The following table rolls forward our deferred revenue from January 1, 2020 to December 31, 2021 (in thousands):

		Deferred Revenue
Beginning Balance, January 1, 2020		$	(63,646	)
Revenue recognized that was included in deferred revenue at the beginning of the       period			40,811
Consideration received in advance of services performed net of revenue recognized       in the current period			(46,719	)
Other			(78	)
Ending Balance, December 31, 2020			(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	)

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, 2021												December 31, 2020
		Level 1				Level 2				Total				Level 1				Level 2				Total
Cash equivalents:
Money market funds		$	29,305			$	—			$	29,305			$	33,535			$	—			$	33,535
Commercial paper			—				1,000				1,000				—				15,746				15,746
Corporate debt securities			—				—				—								1,351				1,351
Short-term investments:
Corporate debt securities			—				24,352				24,352				—				38,672				38,672
U.S. government agency bonds			—				—				—				—				4,642				4,642
Asset-backed securities			—				3,685				3,685				—				8,284				8,284
Total		$	29,305			$	29,037			$	58,342			$	33,535			$	68,695			$	102,230

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, 2021								December 31, 2020
		Carrying Value				Fair Value				Carrying Value				Fair Value
2021 Credit Agreement (carrying value including      current maturities)		$	148,125			$	148,125			$	—			$	—
2018 Credit Agreement (carrying value including      current maturities)			—				—				126,563				126,563
2016 Convertible debt (par value)			230,000				244,950				230,000				244,663

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, 2021								December 31, 2020
		Assets				Liabilities				Assets				Liabilities
Settlement assets/liabilities		$	171,505			$	170,514			$	149,785			$	148,818
Merchant reserve assets/liabilities			14,762				14,762				16,246				16,246
Total		$	186,267			$	185,276			$	166,031			$	165,064

Allowance for Doubtful Accounts Receivable

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

		2021				2020				2019
Balance, beginning of year		$	3,628			$	3,735			$	3,115
Additions to expense			1,102				1,481				778
Write-offs			(466	)			(1,532	)			(158	)
Other			(14	)			(56	)			—
Balance, end of year		$	4,250			$	3,628			$	3,735

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):

		2021				2020				2019
Basic weighted-average common shares			31,776				32,010				32,051
Dilutive effect of restricted common stock			234				268			282
Dilutive effect of Stock Warrants			-				-			132
Diluted weighted-average common shares			32,010				32,278				32,465

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