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Accounts Receivable (Tables)
3 Months Ended
Mar. 31, 2019
Receivables [Abstract]  
Schedule of accounts receivable

   March 31,
2019
   December 31,
2018
 
Accounts receivable  $14,436,421   $13,855,040 
Less: allowance for doubtful accounts   (11,305,983)   (9,527,060)
   $3,130,438   $4,327,980