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Accounts Receivable and Contract Assets (Tables)
12 Months Ended
Dec. 31, 2020
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, 2020
  
Dec. 31, 2019
  
Change
 
Accounts receivable – customers
 
$
5,633
  
$
4,574
  
$
1,059
 
Other receivables
  
206
   
152
   
54
 
   
5,839
   
4,726
   
1,113
 
Less: allowance for doubtful accounts
  
(655
)
  
(305
)
  
(350
)
Accounts receivable, net
 
$
5,184
  
$
4,421
  
$
763
 
             
Unbilled revenue
 
$
2,847
  
$
2,276
  
$
571