Revenue and Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accounts Receivable [Line Items]
Concentration risk, percentage (in hundredths)									100.00%		100.00%		100.00%
Components of Accounts Receivable [Abstract]
Billed accounts receivable	$ 15,447				$ 29,492				$ 15,447		$ 29,492
Unbilled receivables	7,447				16,461				7,447		16,461
Allowance for doubtful accounts	(372)				(321)				(372)		(321)		(319)
Accounts Receivable, Net, Total	22,522				45,632				22,522		45,632
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance Beginning of Year				321				319	321		319		375
Bad Debt Expenses									51	[1]	2	[1]	(53)	[1]
Deductions									0	[2]	0	[2]	(3)	[2]
Balance End of Year	372				321				372		321		319
Revenue by Customer Sector [Abstract]
Revenue	29,902	38,507	29,009	30,144	55,323	49,279	55,214	47,578	127,562		207,394		226,096
Federal [Member]
Accounts Receivable [Line Items]
Concentration risk, percentage (in hundredths)									96.10%		98.30%		99.10%
Revenue by Customer Sector [Abstract]
Revenue									122,549		203,917		224,010
Federal [Member] | Revenue from Contracts and Subcontracts [Member]
Accounts Receivable [Line Items]
Concentration risk, percentage (in hundredths)									96.10%		98.30%		99.10%
Federal [Member] | Accounts Receivable [Member]
Accounts Receivable [Line Items]
Concentration risk, percentage (in hundredths)									94.30%
Commercial [Member]
Accounts Receivable [Line Items]
Concentration risk, percentage (in hundredths)									3.90%		1.70%		0.90%
Revenue by Customer Sector [Abstract]
Revenue									$ 5,013		$ 3,477		$ 2,086

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

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