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Contract Receivables (Tables)
 6 Months Ended
Jun. 30, 2022
Contract Receivables [Abstract]  
Contract Receivables
The components of contract receivables were as follows:
(in thousands)
  
June 30, 2022
   
December 31, 2021
 
             
Billed receivables
  
$
4,543
    
$
6,124
  
Unbilled receivables
    
6,056
      
6,143
  
Allowance for doubtful accounts
    
(1,064
)
    
(1,010
)
Total contract receivables, net
  
$
9,535
    
$
11,257