Revenue and Accounts Receivable (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Accounts Receivable [Line Items]
Concentration risk, percentage										100.00%	100.00%	100.00%
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%
Maximum limit of sold receivables										$ 10,000
Sold receivables during the period										23,400	$ 35,300
Loss recognized in selling, general and administrative expenses										100	200
Balance of sold receivables										0	1,000
Deferred price related to sold receivables											100
Components of Accounts Receivable [Abstract]
Billed accounts receivable													$ 11,736	$ 13,164
Unbilled receivables													13,195	6,352
Allowance for doubtful accounts		$ (411)			$ (429)	$ (429)			$ (485)	(411)	(429)	$ (485)	(411)	(429)
Accounts Receivable, Net, Total													$ 24,520	$ 19,087
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance Beginning of Year					429				485	429	485	372
Bad Debt Expenses	[1]									(18)	(56)	113
Deductions	[2]									0	0	0
Balance End of Year		411				429				411	429	485
Revenue by Customer Sector [Abstract]
Revenue		$ 35,278	$ 28,243	$ 21,096	$ 23,110	$ 26,052	$ 54,940	$ 26,798	$ 27,078	$ 107,727	$ 134,868	$ 120,634
Federal [Member]
Accounts Receivable [Line Items]
Concentration risk, percentage										94.20%	96.70%	97.30%
Revenue by Customer Sector [Abstract]
Revenue										$ 101,519	$ 130,415	$ 117,328
Federal [Member] | Revenue from Contracts and Subcontracts [Member]
Accounts Receivable [Line Items]
Concentration risk, percentage										94.20%	96.70%	97.30%
Federal [Member] | Accounts Receivable [Member]
Accounts Receivable [Line Items]
Concentration risk, percentage										96.50%
State & Local, and Commercial [Member]
Accounts Receivable [Line Items]
Concentration risk, percentage										5.80%	3.30%	2.70%
Revenue by Customer Sector [Abstract]
Revenue										$ 6,208	$ 4,453	$ 3,306

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

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