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Contract Receivables (Tables)
 3 Months Ended
Mar. 31, 2020
Contract Receivables [Abstract]  
Contract Receivables
The components of contract receivables are as follows:

(in thousands)
 
March 31, 2020
  
December 31, 2019
 
       
Billed receivables
 
$
6,707
  
$
11,041
 
Unbilled receivables
  
7,377
   
6,624
 
Allowance for doubtful accounts
  
(434
)
  
(458
)
Total contract receivables, net
 
$
13,650
  
$
17,207