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Payables to Former Subsidiaries (Tables)
3 Months Ended
Mar. 31, 2021
Receivables From Former Subsidiaries [Abstract]  
Schedule of payables to a former subsidiaries, net
   December 31,   March 31, 
   2020   2021 
BAK Tianjin  $29,852   $21,365 
BAK Shenzhen   597,138    361,273 
    626,990    382,638