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Accounts Receivable, Net
12 Months Ended
Sep. 30, 2020
Credit Loss, Additional Improvements [Abstract]  
ACCOUNTS RECEIVABLE, NET
3. ACCOUNTS RECEIVABLE, NET

As of September 30, 2019 and 2020, accounts receivable and allowance for doubtful accounts consisted of the following:


   As of September 30, 
   2019   2020 
Accounts receivable  $115,400   $6,638,266 
Less: allowance for doubtful accounts   -    (21,451)
Accounts receivable, net  $115,400   $6,616,815