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Accounts and Unbilled Receivables (Tables)
12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable
 
December 31, 2017 (in thousands)
Accounts receivable
$
5,418

Unbilled receivables
2,504

 
 
 
$
7,922