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Contract Receivables (Tables)
 3 Months Ended
Mar. 31, 2021
Contract Receivables [Abstract]  
Contract Receivables
The components of contract receivables were as follows:

(in thousands)
 
March 31, 2021
  
December 31, 2020
 
       
Billed receivables
 
$
5,202
  
$
5,694
 
Unbilled receivable
  
6,906
   
5,160
 
Allowance for doubtful accounts
  
(359
)
  
(360
)
Total contract receivables, net
 
$
11,749
  
$
10,494