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Accounts Receivable and Contract Assets (Tables)
 12 Months Ended
Dec. 31, 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
    
As of
        
   
Dec. 31, 2022
    
Dec. 31, 2021
    
Change
  
                   
Accounts receivable – customers
  
$
7,069
    
$
5,034
    
$
2,035
Other receivables
    
487
      
455
      
32
  
     
7,556
      
5,489
      
2,067
Less: allowance for doubtful accounts
    
(855
)
    
(855
)
    
–
Accounts receivable, net
  
$
6,701
    
$
4,634
    
$
2,067
                         
Unbilled revenue
  
$
3,290
    
$
2,784
    
$
506