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Accounts Receivable and Contract Assets
12 Months Ended
Dec. 31, 2020
Accounts Receivable and Contract Assets [Abstract]  
Accounts Receivable and Contract Assets
3.  Accounts Receivable and Contract Assets

Accounts receivable and contract assets are summarized in the following table:

 
As of
  
As of
    
  
Dec. 31, 2020
  
Dec. 31, 2019
  
Change
 
Accounts receivable – customers
 
$
5,633
  
$
4,574
  
$
1,059
 
Other receivables
  
206
   
152
   
54
 
   
5,839
   
4,726
   
1,113
 
Less: allowance for doubtful accounts
  
(655
)
  
(305
)
  
(350
)
Accounts receivable, net
 
$
5,184
  
$
4,421
  
$
763
 
             
Unbilled revenue
 
$
2,847
  
$
2,276
  
$
571
 

Differences in timing of revenue recognition, billings, and cash collections result in receivables and contract assets.  Generally, billing occurs subsequent to revenue recognition, resulting in a contract asset reported as unbilled revenue on the balance sheet.  The Company does not receive advances or deposits from customers before revenue is recognized so no contract liabilities are reported.  Accounts receivable are recorded when the right to consideration becomes unconditional and are presented separately on the balance sheet.  The changes in accounts receivable – customers and in unbilled revenue were primarily due to normal timing difference between performance and the customer’s payments.  In 2020, a weakening in the timeliness of payments due to the COVID-19 pandemic increased the accounts receivable – customers.  This was considered in the review of the allowance for doubtful accounts resulting in the increase in the balance in 2020.