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Contract Receivables (Tables)
 6 Months Ended
Jun. 30, 2016
Contract Receivables [Abstract]  
Components of contract receivables
The components of contract receivables are as follows:

(in thousands)
 
June 30,
  
December 31,
 
  
2016
  
2015
 
       
Billed receivables
 
$
9,878
  
$
9,831
 
Unbilled receivables
  
4,681
   
3,325
 
Allowance for doubtful accounts
  
(21
)
  
(103
)
Total contract receivables, net
 
$
14,538
  
$
13,053