Revenues - Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Unbilled receivable	$ 21,230	$ 20,663
ASUS
Disaggregation of Revenue [Line Items]
Unbilled receivable	11,629	10,125
Receivable from the U.S. government	96,378	85,456
Contract assets	15,510	14,982
Contract liabilities	$ 585	$ 903