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Accounts Receivable and Contract Assets (Tables)
 3 Months Ended
Mar. 31, 2022
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, 2022
    
As of
Dec. 31, 2021
    
Change
  
                   
Accounts receivable – customers
  
$
4,829
    
$
5,034
    
$
(205
)
Other receivables
    
457
      
455
      
2
     
5,286
      
5,489
      
(203
)
Less: allowance for doubtful accounts
    
(852
)
    
(855
)
    
3
Accounts receivable, net
  
$
4,434
    
$
4,634
    
$
(200
)
                         
Unbilled revenue
  
$
3,044
    
$
2,784
    
$
260