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Contract Receivables (Tables)
 9 Months Ended
Sep. 30, 2017
Contract Receivables [Abstract]  
Components of Contract Receivables
The components of contract receivables are as follows:

(in thousands)
September 30,
 
December 31,
 
2017
 
2016
      
Billed receivables
$
12,039
 
$
13,325
Recoverable costs and accrued profit not yet billed
 
6,715
  
5,555
Allowance for doubtful accounts
 
(138)
  
(17)
Total contract receivables, net
$
18,616
 
$
18,863