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Contract Receivables (Tables)
 3 Months Ended
Mar. 31, 2019
Contract Receivables [Abstract]  
Contract Receivables
The components of contract receivables are as follows:

(in thousands)
 
March 31,
  
December 31,
 
  
2019
  
2018
 
       
Billed receivables
 
$
10,205
  
$
15,998
 
Unbilled receivables
  
8,859
   
5,506
 
Allowance for doubtful accounts
  
(428
)
  
(427
)
Total contract receivables, net
 
$
18,636
  
$
21,077