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Accounts Receivable and Contract Assets (Tables)
 3 Months Ended
Mar. 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
Mar. 31, 2021
  
As of
Dec. 31, 2020
  
Change
 
          
Accounts receivable – customers
 
$
4,416
  
$
5,633
  
$
(1,217
)
Other receivables
  
314
   
206
   
108
 
   
4,730
   
5,839
   
(1,109
)
Less: allowance for doubtful accounts
  
(714
)
  
(655
)
  
(59
)
Accounts receivable, net
 
$
4,016
  
$
5,184
  
$
(1,168
)
             
Unbilled revenue
 
$
2,876
  
$
2,847
  
$
29