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Payables to Former Subsidiaries, net (Tables)
 9 Months Ended
Sep. 30, 2021
Receivables From Former Subsidiaries [Abstract]  
Schedule of payables to a former subsidiaries, net
   December 31,   September 30, 
   2020   2021 
BAK Tianjin  $29,852   $7,970 
BAK Shenzhen   597,138    353,904 
   $626,990   $361,874