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Accounts Receivable and Contract Assets (Tables)
 3 Months Ended
Mar. 31, 2023
Accounts Receivable and Contract Assets [Abstract]  
Accounts Receivable and Contract Assets
Accounts receivable and contract assets are summarized in the following table:

    As of     As of        
 
Mar. 31, 2023
    
Dec. 31, 2022
    
Change
  
                   
Accounts receivable – customers
  
$
5,923
    
$
7,069
    
$
(1,146
)
Other receivables
    
371
      
487
      
(116
)
     
6,294
      
7,556
      
(1,262
)
Less: allowance for doubtful accounts
    
(875
)
    
(855
)
    
(20
)
Accounts receivable, net
  
$
5,419
    
$
6,701
    
$
(1,282
)
                         
Unbilled revenue
  
$
3,473
    
$
3,290
    
$
183