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Revenue and Accounts Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
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%        
Maximum limit of sold receivables                 $ 10,000        
Sold receivables during the period                 18,100 $ 23,400      
Loss recognized in selling, general and administrative expenses                 100        
Balance of sold receivables                 900 0      
Deferred price related to sold receivables                 100        
Components of Accounts Receivable [Abstract]                          
Billed accounts receivable                       $ 18,848 $ 11,736
Unbilled receivables                       16,000 13,195
Allowance for doubtful accounts $ (306)     $ (411) $ (411)     $ (429) (411) (411) $ (429) (306) (411)
Total accounts receivable                       $ 34,542 $ 24,520
Activities in Allowance for Doubtful Accounts [Roll Forward]                          
Balance Beginning of Year       411       429 411 429 485    
Bad Debt Expenses [1]                 (105) (18) (56)    
Deductions [2]                 0 0 0    
Balance End of Year 306       411       306 411 429    
Revenue by Customer Sector [Abstract]                          
Revenue $ 35,977 $ 34,695 $ 34,943 $ 32,401 $ 35,278 $ 28,243 $ 21,096 $ 23,110 $ 138,016 $ 107,727 $ 134,868    
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                 $ 138,016 $ 107,727 $ 134,868    
Federal [Member] | Revenue from Contracts and Subcontracts [Member]                          
Accounts Receivable [Line Items]                          
Concentration risk percentage                 93.70% 94.20% 96.70%    
Revenue by Customer Sector [Abstract]                          
Revenue                 $ 129,279 $ 101,519 $ 130,415    
Federal [Member] | Accounts Receivable [Member]                          
Accounts Receivable [Line Items]                          
Concentration risk percentage                 98.20%        
State & Local, and Commercial [Member] | Revenue from Contracts and Subcontracts [Member]                          
Accounts Receivable [Line Items]                          
Concentration risk percentage                 6.30% 5.80% 3.30%    
Revenue by Customer Sector [Abstract]                          
Revenue                 $ 8,737 $ 6,208 $ 4,453    
[1] Accounts receivable reserves and reversal of allowance for subsequent collections, net
[2] Accounts receivable written-off and subsequent recoveries, net