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Accounts Receivable and Contract Assets (Tables)
 3 Months Ended
Mar. 31, 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
Mar. 31, 2020
  
As of
Dec. 31, 2019
  
Change
 
          
Accounts receivable – customers
 
$
4,334
  
$
4,574
  
$
(240
)
Life insurance receivable
  
671
   
-
   
671
 
Other receivables
  
213
   
152
   
61
 
   
5,218
   
4,726
   
492
 
Less: allowance for doubtful accounts
  
(343
)
  
(305
)
  
(38
)
Accounts receivable, net
 
$
4,875
  
$
4,421
  
$
454
 
             
Unbilled revenue
 
$
2,693
  
$
2,276
  
$
417