Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 50,160	$ 55,757
Services
Disaggregation of Revenue [Line Items]
Total revenue	48,108	52,058
Product
Disaggregation of Revenue [Line Items]
Total revenue	2,052	3,699
Security Solutions
Disaggregation of Revenue [Line Items]
Total revenue	26,919	22,829
Security Solutions | Services
Disaggregation of Revenue [Line Items]
Total revenue	24,867	19,130
Security Solutions | Product
Disaggregation of Revenue [Line Items]
Total revenue	2,052	3,699
Secure Networks
Disaggregation of Revenue [Line Items]
Total revenue	23,241	32,928
Secure Networks | Services
Disaggregation of Revenue [Line Items]
Total revenue	23,241	32,928
Firm fixed-price | Security Solutions
Disaggregation of Revenue [Line Items]
Total revenue	22,467	18,012
Firm fixed-price | Secure Networks
Disaggregation of Revenue [Line Items]
Total revenue	18,810	31,129
Time-and-materials | Security Solutions
Disaggregation of Revenue [Line Items]
Total revenue	2,916	3,001
Time-and-materials | Secure Networks
Disaggregation of Revenue [Line Items]
Total revenue	0	29
Cost plus fixed fee | Security Solutions
Disaggregation of Revenue [Line Items]
Total revenue	1,536	1,816
Cost plus fixed fee | Secure Networks
Disaggregation of Revenue [Line Items]
Total revenue	4,431	1,770
Federal | Security Solutions
Disaggregation of Revenue [Line Items]
Total revenue	24,602	20,451
Federal | Secure Networks
Disaggregation of Revenue [Line Items]
Total revenue	$ 23,241	$ 32,897
Federal | Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	95.00%	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	71.40%	84.30%
Civilian | Revenue from Contract with Customer, Product and Service Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	24.00%	11.40%
State & Local, and Commercial | Security Solutions
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,317	$ 2,378
State & Local, and Commercial | Secure Networks
Disaggregation of Revenue [Line Items]
Total revenue	$ 0	$ 31