Accounts Receivable and Contract Assets, Net - Schedule of Changes in Allowance for Credit Losses for Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Allowance For Credit Loss [Abstract]
Balance, beginning of period	$ (5,243)	$ (2,257)	$ (3,788)	$ (1,125)
Provision for expected credit losses	(321)	(372)	(1,738)	(1,700)
Write-offs, net	283	32	245	228
Balance, end of period	$ (5,281)	$ (2,597)	$ (5,281)	$ (2,597)