Revenues - Revenues by Contract (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 37,613	$ 36,311	$ 74,003	$ 71,881
Time and materials
Disaggregation of Revenue [Line Items]
Revenues	26,659	28,118	50,657	56,961
Firm fixed price
Disaggregation of Revenue [Line Items]
Revenues	6,855	8,193	14,952	14,920
Cost-plus
Disaggregation of Revenue [Line Items]
Revenues	$ 4,099	$ 0	$ 8,394	$ 0