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Contract Receivables (Tables)
 9 Months Ended
Sep. 30, 2018
Contract Receivables [Abstract]  
Contract Receivables
The components of contract receivables are as follows:

(in thousands)
 
September 30,
  
December 31,
 
  
2018
  
2017
 
       
Billed receivables
 
$
12,592
  
$
8,154
 
Unbilled receivables
  
6,926
   
5,980
 
Allowance for doubtful accounts
  
(280
)
  
(137
)
Total contract receivables, net
 
$
19,238
  
$
13,997