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Accounts Receivable and Contract Assets (Tables)
 9 Months Ended
Sep. 30, 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
Sep. 30, 2021
    
As of
Dec. 31, 2020
    
Change
  
                   
Accounts receivable – customers
  
$
4,716
    
$
5,633
    
$
(917
)
Other receivables
    
75
      
206
      
(131
)
     
4,791
      
5,839
      
(1,048
)
Less: allowance for doubtful accounts
    
(856
)
    
(655
)
    
(201
)
Accounts receivable, net
  
$
3,935
    
$
5,184
    
$
(1,249
)
                         
Unbilled revenue
  
$
3,047
    
$
2,847
    
$
200