Accounts Receivable and Contract Assets, Net - Schedule of Changes in Allowance for Credit Losses for Contract Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Allowance For Credit Loss [Abstract]
Balance, beginning of period	$ (842)	$ (25)	$ (398)
Provision for expected credit losses	(29)	(3)	(473)	$ (28)
Write-offs	30		30
Balance, end of period	$ (841)	$ (28)	$ (841)	$ (28)