Accounts Receivable and Contract Assets, Net - Schedule of Changes in Allowance for Credit Losses for Contract Assets (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	$ (841)	$ (28)	$ (398)
Provision for expected credit losses	(316)	8	(789)	$ (20)
Write-offs	7		37
Balance, end of period	$ (1,150)	$ (20)	$ (1,150)	$ (20)