Revenues - Concentration of Risk (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Concentration Risk [Line Items]
Revenues	$ 36,390	$ 35,570
Percent of total revenues	100.00%	100.00%
Cyber & Engineering
Concentration Risk [Line Items]
Revenues	$ 17,333	$ 18,559
Analytics
Concentration Risk [Line Items]
Revenues	19,057	17,011
Customer Concentration Risk | Revenue Benchmark | Customer A
Concentration Risk [Line Items]
Revenues	$ 7,264	$ 8,342
Percent of total revenues	20.00%	23.00%
Customer Concentration Risk | Revenue Benchmark | Customer A | Cyber & Engineering
Concentration Risk [Line Items]
Revenues	$ 7,264	$ 8,342
Customer Concentration Risk | Revenue Benchmark | Customer A | Analytics
Concentration Risk [Line Items]
Revenues	0	0
Customer Concentration Risk | Revenue Benchmark | Customer B
Concentration Risk [Line Items]
Revenues	$ 4,497	$ 3,755
Percent of total revenues	12.00%	11.00%
Customer Concentration Risk | Revenue Benchmark | Customer B | Cyber & Engineering
Concentration Risk [Line Items]
Revenues	$ 4,497	$ 3,755
Customer Concentration Risk | Revenue Benchmark | Customer B | Analytics
Concentration Risk [Line Items]
Revenues	0	0
Customer Concentration Risk | Revenue Benchmark | Customer C
Concentration Risk [Line Items]
Revenues	$ 5,351	$ 0
Percent of total revenues	15.00%	0.00%
Customer Concentration Risk | Revenue Benchmark | Customer C | Cyber & Engineering
Concentration Risk [Line Items]
Revenues	$ 0	$ 0
Customer Concentration Risk | Revenue Benchmark | Customer C | Analytics
Concentration Risk [Line Items]
Revenues	5,351	0
Customer Concentration Risk | Revenue Benchmark | All others
Concentration Risk [Line Items]
Revenues	$ 19,278	$ 23,473
Percent of total revenues	53.00%	66.00%
Customer Concentration Risk | Revenue Benchmark | All others | Cyber & Engineering
Concentration Risk [Line Items]
Revenues	$ 5,572	$ 6,462
Customer Concentration Risk | Revenue Benchmark | All others | Analytics
Concentration Risk [Line Items]
Revenues	$ 13,706	$ 17,011