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Accounts Receivable and Contract Assets (Tables)
 6 Months Ended
Jun. 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
Jun. 30, 2022
    
As of
Dec. 31, 2021
    
Change
  
                   
Accounts receivable – customers
  
$
5,742
    
$
5,034
    
$
708
Other receivables
    
352
      
455
      
(103
)
     
6,094
      
5,489
      
605
Less: allowance for doubtful accounts
    
(824
)
    
(855
)
    
31
Accounts receivable, net
  
$
5,270
    
$
4,634
    
$
636
                         
Unbilled revenue
  
$
3,014
    
$
2,784
    
$
230