REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 23,783	$ 36,186	$ 81,900	$ 104,319
Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Total revenue	$ 23,783	$ 36,186	$ 81,900	$ 104,319
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	$ 18,293	$ 27,809	$ 63,308	$ 80,116
Concentration risk, percentage	77.00%	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	$ 3,045	$ 3,504	$ 9,204	$ 10,608
Concentration risk, percentage	13.00%	10.00%	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	$ 2,445	$ 4,873	$ 9,388	$ 13,595
Concentration risk, percentage	10.00%	13.00%	12.00%	13.00%
Federal | Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Total revenue	$ 20,607	$ 32,955	$ 72,046	$ 93,456
Concentration risk, percentage	87.00%	91.00%	88.00%	90.00%
State, local, and commercial | Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,176	$ 3,231	$ 9,854	$ 10,863
Concentration risk, percentage	13.00%	9.00%	12.00%	10.00%
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	46.00%	61.00%	53.00%	65.00%
U.S. Department of Homeland Security ("DHS") | Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	16.00%	6.00%	15.00%	3.00%