Revenues - Revenues by Contract (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 38,459	$ 37,613	$ 80,613	$ 74,003
Time and materials
Disaggregation of Revenue [Line Items]
Total revenues	21,122	26,659	48,281	50,657
Firm fixed price
Disaggregation of Revenue [Line Items]
Total revenues	12,577	6,855	22,977	14,952
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Total revenues	$ 4,760	$ 4,099	$ 9,355	$ 8,394