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Accounts Receivable and Contract Assets (Tables)
 6 Months Ended
Jun. 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
Jun. 30, 2018
  
As of
Dec. 31, 2017
  
Change
 
             
Accounts receivable – customers
 
$
4,482
  
$
4,661
  
$
(179
)
Other receivables
  
182
   
191
   
(9
)
   
4,664
   
4,852
   
(188
)
Less: allowance for doubtful accounts
  
(343
)
  
(305
)
  
(38
)
Accounts receivable, net
 
$
4,321
  
$
4,547
  
$
(226
)
             
Unbilled revenue
 
$
2,517
  
$
2,459
  
$
58