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Accounts Receivable and Contract Assets (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019
  
As of
Dec. 31, 2018
  
Change
 
 
Accounts receivable – customers
 
$
4,651
  
$
4,731
  
$
(80
)
Other receivables
  
211
   
385
   
(174
)
   
4,862
   
5,116
   
(254
)
Less: allowance for doubtful accounts
  
(317
)
  
(305
)
  
(12
)
Accounts receivable, net
 
$
4,545
  
$
4,811
  
$
(266
)
             
Unbilled revenue
 
$
2,394
  
$
2,427
  
$
(33
)