Revenue and Accounts Receivable (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable [Line Items]
Maximum limit of sold receivables										$ 10,000
Sold receivables during the period										0	$ 12,600
Loss recognized in selling, general and administrative expenses											100
Balance of sold receivables														$ 0
Components of Accounts Receivable [Abstract]
Billed accounts receivable													$ 12,060	11,917
Unbilled receivables													19,161	16,745
Allowance for doubtful accounts		$ (308)			$ (720)	$ (720)			$ (306)	(308)	(306)	$ (306)	(308)	(720)
Total													$ 30,913	$ 27,942
Activities in Allowance for Doubtful Accounts [Roll Forward]
Balance beginning of year					720				306	720	306	411
Bad debt expenses	[1]									(412)	414	(105)
Recoveries	[2]									0	0	0
Balance end of year		308				720				308	720	306
Revenue by Customer Sector [Abstract]
Revenue		$ 44,887	$ 47,440	$ 48,610	$ 38,980	$ 46,473	$ 45,531	$ 36,048	$ 31,166	$ 179,917	$ 159,218	$ 138,016
Revenue from Contracts and Subcontracts [Member]
Accounts Receivable [Line Items]
Concentration risk percentage										100.00%	100.00%	100.00%
Revenue by Customer Sector [Abstract]
Revenue										$ 179,917	$ 159,218	$ 138,016
Federal [Member]
Accounts Receivable [Line Items]
Percentage of initial payment by factor of U.S. Federal government receivables										90.00%
Percentage of initial payment by factor of commercial prime contractors										85.00%
Revenue by Customer Sector [Abstract]
Revenue										$ 171,677	$ 149,257	$ 129,279
Federal [Member] | Revenue from Contracts and Subcontracts [Member]
Accounts Receivable [Line Items]
Concentration risk percentage										95.40%	93.70%	93.70%
Revenue by Customer Sector [Abstract]
Revenue										$ 171,677	$ 149,257	$ 129,279
Federal [Member] | Accounts Receivable [Member]
Accounts Receivable [Line Items]
Concentration risk percentage										96.10%
State & Local, and Commercial [Member]
Revenue by Customer Sector [Abstract]
Revenue										$ 8,240	$ 9,961	$ 8,737
State & Local, and Commercial [Member] | Revenue from Contracts and Subcontracts [Member]
Accounts Receivable [Line Items]
Concentration risk percentage										4.60%	6.30%	6.30%
Revenue by Customer Sector [Abstract]
Revenue										$ 8,240	$ 9,961	$ 8,737

[1] Accounts receivable reserves and reversal of allowance for subsequent collections, net

[2] Accounts receivable written-off and subsequent recoveries, net