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Accounts Receivable and Contract Assets (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020
  
As of
Dec. 31, 2019
  
Change
 
          
Accounts receivable – customers
 
$
5,200
  
$
4,574
  
$
626
 
Other receivables
  
181
   
152
   
29
 
   
5,381
   
4,726
   
655
 
Less: allowance for doubtful accounts
  
(410
)
  
(305
)
  
(105
)
Accounts receivable, net
 
$
4,971
  
$
4,421
  
$
550
 
             
Unbilled revenue
 
$
2,687
  
$
2,276
  
$
411