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3. Accounts Receivable, Net (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Credit Loss [Abstract]    
Accounts receivable, gross $ 2,725,065 $ 2,557,326
Less: Allowance for doubtful accounts (1,160,976) (1,073,743)
Accounts receivable, net $ 1,564,089 $ 1,483,583