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Accounts Receivable and Contract Assets (Tables)
 9 Months Ended
Sep. 30, 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        
 
Sep. 30, 2023
    
Dec. 31, 2022
    
Change
  
                   
Accounts receivable – customers
  
$
7,994
    
$
7,069
    
$
925
  
Other receivables
    
235
      
487
      
(252
)
     
8,229
      
7,556
      
673
  
Less: allowance for doubtful accounts
    
(875
)
    
(855
)
    
(20
)
Accounts receivable, net
  
$
7,354
    
$
6,701
    
$
653
  
                         
Unbilled revenue
  
$
3,249
    
$
3,290
    
$
(41
)