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Accounts Receivable and Contract Assets
 6 Months Ended
Jun. 30, 2023
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        
 
Jun. 30, 2023
    
Dec. 31, 2022
    
Change
  
                   
Accounts receivable – customers
  
$
6,862
    
$
7,069
    
$
(207
)
Other receivables
    
109
      
487
      
(378
)
     
6,971
      
7,556
      
(585
)
Less: allowance for doubtful accounts
    
(875
)
    
(855
)
    
(20
)
Accounts receivable, net
  
$
6,096
    
$
6,701
    
$
(605
)
                         
Unbilled revenue
  
$
3,869
    
$
3,290
    
$
579
  

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 the normal timing difference between performance and the customer’s payments.