Contract Balances (Tables)

12 Months Ended

Dec. 31, 2018

Contract With Customer Asset And Liability [Abstract]

Schedule of Accounts Receivable

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

	December 31,
	2018			2017
				(as adjusted)
Billed and billable	$	176,848		$	169,554
Less: allowance for doubtful accounts		(5,489	)		(4,190	)
Accounts receivable, net	$	171,359		$	165,364

Deferred Revenue and Advance Payments

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

	December 31,
	2018		2017
			(as adjusted)
Current:
Deferred product licenses revenue	$	1,768	$	3,760
Deferred subscription services revenue		13,508		17,324
Deferred product support revenue		152,501		168,185
Deferred other services revenue		8,763		9,465
Total current deferred revenue and advance payments	$	176,540	$	198,734
Non-current:
Deferred product licenses revenue	$	542	$	820
Deferred subscription services revenue		2,384		126
Deferred product support revenue		3,091		4,826
Deferred other services revenue		452		628
Total non-current deferred revenue and advance payments	$	6,469	$	6,400