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Accounts Receivable and Contract Assets (Tables)
 12 Months Ended
Dec. 31, 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
  
As of
    
  
Dec. 31, 2019
  
Dec. 31, 2018
  
Change
 
             
Accounts receivable – customers
 
$
4,574
  
$
4,731
  
$
(157
)
Other receivables
  
152
   
385
   
(233
)
   
4,726
   
5,116
   
(390
)
Less: allowance for doubtful accounts
  
(305
)
  
(305
)
  
–
 
Accounts receivable, net
 
$
4,421
  
$
4,811
  
$
(390
)
             
Unbilled revenue
 
$
2,276
  
$
2,427
  
$
(151
)