REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 28,498	$ 32,911	$ 58,117	$ 68,133
Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Total revenue	$ 28,498	$ 32,911	$ 58,117	$ 68,133
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk | Firm fixed-price
Disaggregation of Revenue [Line Items]
Total revenue	$ 22,179	$ 25,293	$ 45,015	$ 52,306
Concentration risk, percentage	78.00%	77.00%	77.00%	77.00%
Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk | Time-and-materials
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,022	$ 3,548	$ 6,159	$ 7,104
Concentration risk, percentage	11.00%	11.00%	11.00%	10.00%
Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk | Cost plus fixed fee
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,297	$ 4,070	$ 6,943	$ 8,723
Concentration risk, percentage	11.00%	12.00%	12.00%	13.00%
Federal | Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Total revenue	$ 24,832	$ 27,512	$ 51,439	$ 60,501
Concentration risk, percentage	87.00%	84.00%	89.00%	89.00%
State & local, and commercial | Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,666	$ 5,399	$ 6,678	$ 7,632
Concentration risk, percentage	13.00%	16.00%	11.00%	11.00%
U.S. Department of Defense ("DoD") | Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	56.00%	66.00%	56.00%	67.00%