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Accounts Receivable and Contract Assets (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021
    
Dec. 31, 2020
    
Change
  
                   
Accounts receivable – customers
  
$
5,034
    
$
5,633
    
$
(599
)
Other receivables
    
455
      
206
      
249
  
     
5,489
      
5,839
      
(350
)
Less: allowance for doubtful accounts
    
(855
)
    
(655
)
    
(200
)
Accounts receivable, net
  
$
4,634
    
$
5,184
    
$
(550
)
                         
Unbilled revenue
  
$
2,784
    
$
2,847
    
$
(63
)