Revenues - Revenues by Contract (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 42,154	$ 36,390
Time and materials
Disaggregation of Revenue [Line Items]
Total revenues	27,159	23,998
Firm fixed price
Disaggregation of Revenue [Line Items]
Total revenues	10,400	8,097
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Total revenues	$ 4,595	$ 4,295