Contract Balances (Tables)

12 Months Ended

Dec. 31, 2021

Contract With Customer Asset And Liability [Abstract]

Schedule of Accounts Receivable

Accounts receivable (in thousands) consisted of the following, as of:

	December 31,
	2021			2020
Billed and billable	$	192,055		$	200,221
Less: allowance for credit losses		(2,775	)		(2,760	)
Accounts receivable, net	$	189,280		$	197,461

Deferred Revenue and Advance Payments

Deferred revenue and advance payments (in thousands) from customers consisted of the following, as of:

	December 31,
	2021		2020
Current:
Deferred product licenses revenue	$	993	$	1,495
Deferred subscription services revenue		35,589		26,258
Deferred product support revenue		166,477		156,216
Deferred other services revenue		6,801		7,281
Total current deferred revenue and advance payments	$	209,860	$	191,250
Non-current:
Deferred product licenses revenue	$	68	$	139
Deferred subscription services revenue		1,064		8,758
Deferred product support revenue		6,203		5,055
Deferred other services revenue		754		710
Total non-current deferred revenue and advance payments	$	8,089	$	14,662