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Payables to Former Subsidiaries (Tables)
9 Months Ended
Sep. 30, 2019
Payables to Former Subsidiaries Net [Abstract]  
Schedule of payable to a former subsidiary
   December 31,   September 30, 
   2018   2019 
BAK Tianjin  $972,913   $- 
BAK Shenzhen   3,328,733    855,860 
   $4,301,646   $855,860