Revenue Recognition - Disaggregation of Revenue (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]
Total revenue	$ 55,791	$ 53,644	$ 105,951	$ 109,402
Federal | Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	94.00%	95.00%	94.00%	96.00%
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	72.00%	67.00%	71.00%	76.00%
Civilian | Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	22.00%	28.00%	23.00%	20.00%
Security Solutions
Disaggregation of Revenue [Line Items]
Total revenue	$ 30,819	$ 32,236	$ 57,738	$ 55,066
Security Solutions | Firm fixed-price
Disaggregation of Revenue [Line Items]
Total revenue	26,275	27,457	48,742	45,469
Security Solutions | Time-and-materials
Disaggregation of Revenue [Line Items]
Total revenue	2,731	3,059	5,646	6,060
Security Solutions | Cost plus fixed fee
Disaggregation of Revenue [Line Items]
Total revenue	1,813	1,720	3,350	3,537
Security Solutions | Federal
Disaggregation of Revenue [Line Items]
Total revenue	27,251	29,830	51,853	50,281
Security Solutions | State & local, and commercial
Disaggregation of Revenue [Line Items]
Total revenue	3,568	2,406	5,885	4,785
Secure Networks
Disaggregation of Revenue [Line Items]
Total revenue	24,972	21,408	48,213	54,336
Secure Networks | Firm fixed-price
Disaggregation of Revenue [Line Items]
Total revenue	19,030	18,885	37,839	50,014
Secure Networks | Time-and-materials
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	29
Secure Networks | Cost plus fixed fee
Disaggregation of Revenue [Line Items]
Total revenue	5,942	2,523	10,374	4,293
Secure Networks | Federal
Disaggregation of Revenue [Line Items]
Total revenue	24,962	21,302	48,203	54,198
Secure Networks | State & local, and commercial
Disaggregation of Revenue [Line Items]
Total revenue	10	106	10	138
Services
Disaggregation of Revenue [Line Items]
Total revenue	50,270	49,003	98,378	101,061
Services | Security Solutions
Disaggregation of Revenue [Line Items]
Total revenue	25,298	27,595	50,165	46,725
Services | Secure Networks
Disaggregation of Revenue [Line Items]
Total revenue	24,972	21,408	48,213	54,336
Products
Disaggregation of Revenue [Line Items]
Total revenue	5,521	4,641	7,573	8,341
Products | Security Solutions
Disaggregation of Revenue [Line Items]
Total revenue	5,521	4,641	7,573	8,341
Products | Secure Networks
Disaggregation of Revenue [Line Items]
Total revenue	$ 0	$ 0	$ 0	$ 0