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Accounts Receivable and Contract Assets (Tables)
 9 Months Ended
Sep. 30, 2018
Accounts Receivable and Contract Assets [Abstract]  
Accounts Receivable and Contract Assets
Accounts receivable and contract assets are summarized in the following table:

  
As of
Sept. 30, 2018
  
As of
Dec. 31, 2017
  
Change
 
          
Accounts receivable – customers
 
$
4,648
  
$
4,661
  
$
(13
)
Other receivables
  
405
   
191
   
214
 
   
5,053
   
4,852
   
201
 
Less: allowance for doubtful accounts
  
(330
)
  
(305
)
  
(25
)
Accounts receivable, net
 
$
4,723
  
$
4,547
  
$
176
 
             
Unbilled revenue
 
$
2,332
  
$
2,459
  
$
(127
)