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Accounts Receivable and Contract Assets (Tables)
 9 Months Ended
Sep. 30, 2022
Accounts Receivable and Contract Assets [Abstract]  
Accounts Receivable and Contract Assets
Accounts receivable and contract assets are summarized in the following table:

 
As of
Sep. 30, 2022
    
As of
Dec. 31, 2021
    
Change
  
                   
Accounts receivable – customers
  
$
5,873
    
$
5,034
    
$
839
Other receivables
    
422
      
455
      
(33
)
     
6,295
      
5,489
      
806
Less: allowance for doubtful accounts
    
(834
)
    
(855
)
    
21
Accounts receivable, net
  
$
5,461
    
$
4,634
    
$
827
                         
Unbilled revenue
  
$
3,084
    
$
2,784
    
$
300