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Revenue and Accounts Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Dec. 31, 2014
Accounts Receivable [Line Items]                            
Concentration risk, percentage                 100.00% 100.00% 100.00%      
Components of Accounts Receivable [Abstract]                            
Billed accounts receivable                         $ 15,340 $ 15,447
Unbilled receivables                         4,190 7,447
Allowance for doubtful accounts $ (485)     $ (372) $ (372)     $ (321) $ (372) $ (372) $ (321) $ (319) (485) (372)
Accounts Receivable, Net, Total                         $ 19,045 $ 22,522
Allowance for Doubtful Accounts Receivable [Roll Forward]                            
Balance Beginning of Year       372       321 372 321   319    
Bad Debt Expenses [1]                 113 51   2    
Deductions [2]                 0 0   $ 0    
Balance End of Year 485       372       485 372 321      
Revenue by Customer Sector [Abstract]                            
Revenue $ 26,925 $ 33,662 $ 32,028 $ 28,019 $ 29,902 $ 38,507 $ 29,009 $ 30,144 $ 120,634 $ 127,562 $ 207,394      
Federal [Member]                            
Accounts Receivable [Line Items]                            
Concentration risk, percentage                 97.30% 96.10% 98.30%      
Revenue by Customer Sector [Abstract]                            
Revenue                 $ 117,328 $ 122,549 $ 203,917      
Federal [Member] | Revenue from Contracts and Subcontracts [Member]                            
Accounts Receivable [Line Items]                            
Concentration risk, percentage                 97.30% 96.10%   98.30%    
Federal [Member] | Accounts Receivable [Member]                            
Accounts Receivable [Line Items]                            
Concentration risk, percentage                 99.90%          
State & Local, and Commercial [Member]                            
Accounts Receivable [Line Items]                            
Concentration risk, percentage                 2.70% 3.90% 1.70%      
Revenue by Customer Sector [Abstract]                            
Revenue                 $ 3,306 $ 5,013 $ 3,477      
[1] Accounts receivable reserves and reversal of allowance for subsequent collections, net
[2] Accounts receivable written-off and subsequent recoveries, net