Contract Balances (Tables)

9 Months Ended

Sep. 30, 2021

Contract With Customer Asset And Liability [Abstract]

Schedule of Accounts Receivable

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

	September 30,			December 31,
	2021			2020
Billed and billable	$	126,118		$	200,221
Less: allowance for credit losses		(2,370	)		(2,760	)
Accounts receivable, net	$	123,748		$	197,461

Deferred Revenue and Advance Payments

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

	September 30,		December 31,
	2021		2020
Current:
Deferred product licenses revenue	$	2,315	$	1,495
Deferred subscription services revenue		23,089		26,258
Deferred product support revenue		130,339		156,216
Deferred other services revenue		4,954		7,281
Total current deferred revenue and advance payments	$	160,697	$	191,250
Non-current:
Deferred product licenses revenue	$	74	$	139
Deferred subscription services revenue		590		8,758
Deferred product support revenue		6,973		5,055
Deferred other services revenue		665		710
Total non-current deferred revenue and advance payments	$	8,302	$	14,662