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Accounts Receivable and Contract Assets (Tables)
 6 Months Ended
Jun. 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
Jun. 30, 2019
  
As of
Dec. 31, 2018
  
Change
 
 
Accounts receivable – customers
 
$
4,632
  
$
4,731
  
$
(99
)
Other receivables
  
186
   
385
   
(199
)
   
4,818
   
5,116
   
(298
)
Less: allowance for doubtful accounts
  
(343
)
  
(305
)
  
(38
)
Accounts receivable, net
 
$
4,475
  
$
4,811
  
$
(336
)
             
Unbilled revenue
 
$
2,274
  
$
2,427
  
$
(153
)