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Payables to Former Subsidiaries, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Payables To Former Subsidiaries Net  
Schedule of trade payable to a former subsidiary
   December 31,   December 31, 
   2017   2018 
BAK Tianjin  $282,682   $972,913 
BAK Shenzhen   22,020,039    3,328,733 
　  $22,302,721   $4,301,646