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ACCOUNTS RECEIVABLE
12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
ACCOUNTS RECEIVABLE

 

5.ACCOUNTS RECEIVABLE

 

Accounts receivable consists of trade receivables as follows:

 

           
   December 31, 
   2020   2019 
Billed receivables  $5,226,468   $7,260,457 
Less: allowance for doubtful accounts   (263,562)   (230,855)
Total accounts receivable, net  $4,962,906   $7,029,602