Annual report pursuant to Section 13 and 15(d)

Receivables, net (Details)

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Receivables, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]    
Allowance for doubtful accounts $ 30 $ 100
Components of Receivables [Abstract]    
Billed 55,669 43,503
Unbilled 45,549 34,968
Total receivables 101,218 78,471
Government contracts receivable $ 2,100 $ 1,500