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Contract Receivables (Tables)
 6 Months Ended
Jun. 30, 2021
Contract Receivables [Abstract]  
Contract Receivables
The components of contract receivables were as follows:
(in thousands)
  
June 30, 2021
   
December 31, 2020
 
             
Billed receivables
  
$
4,004
    
$
5,694
  
Unbilled receivables
    
7,577
      
5,160
  
Allowance for doubtful accounts
    
(213
)
    
(360
)
Total contract receivables, net
  
$
11,368
    
$
10,494