Contract Balances (Tables)

3 Months Ended

Mar. 31, 2019

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,
	2019			2018
Billed and billable	$	138,490		$	176,848
Less: allowance for doubtful accounts		(4,568	)		(5,489	)
Accounts receivable, net	$	133,922		$	171,359

Deferred Revenue and Advance Payments

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

	March 31,		December 31,
	2019		2018
Current:
Deferred product licenses revenue	$	555	$	1,768
Deferred subscription services revenue		15,641		13,508
Deferred product support revenue		166,306		152,501
Deferred other services revenue		7,568		8,763
Total current deferred revenue and advance payments	$	190,070	$	176,540
Non-current:
Deferred product licenses revenue	$	479	$	542
Deferred subscription services revenue		247		2,384
Deferred product support revenue		3,231		3,091
Deferred other services revenue		582		452
Total non-current deferred revenue and advance payments	$	4,539	$	6,469