Contract Balances (Tables)

3 Months Ended

Mar. 31, 2021

Contract With Customer Asset And Liability [Abstract]

Schedule of Accounts Receivable

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

	March 31,			December 31,
	2021			2020
Billed and billable	$	152,686		$	200,221
Less: allowance for credit losses		(2,060	)		(2,760	)
Accounts receivable, net	$	150,626		$	197,461

Deferred Revenue and Advance Payments

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

	March 31,		December 31,
	2021		2020
Current:
Deferred product licenses revenue	$	195	$	1,495
Deferred subscription services revenue		25,689		26,258
Deferred product support revenue		167,282		156,216
Deferred other services revenue		5,814		7,281
Total current deferred revenue and advance payments	$	198,980	$	191,250
Non-current:
Deferred product licenses revenue	$	67	$	139
Deferred subscription services revenue		8,317		8,758
Deferred product support revenue		5,401		5,055
Deferred other services revenue		732		710
Total non-current deferred revenue and advance payments	$	14,517	$	14,662