Revenues - Revenues by Contract (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 36,390	$ 35,570
Time and materials
Disaggregation of Revenue [Line Items]
Revenues	23,998	28,843
Firm fixed price
Disaggregation of Revenue [Line Items]
Revenues	8,097	6,727
Cost-plus
Disaggregation of Revenue [Line Items]
Revenues	$ 4,295	$ 0

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details