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v3.20.1

Payables to former subsidiaries, net (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Proceeds on disposal of patented proprietary technology offset against amount due to a former subsidiary | $ 2,845,795 |
Gain on disposal of patented proprietary technology |  | $ 12,118,675
Bak Shenzhen [Member] |  |
Proceeds on disposal of patented proprietary technology offset against amount due to a former subsidiary | 12,845,795 |
BAK Shenzhen [Member] | RMB [Member] |  |
Gain on disposal of patented proprietary technology | $ 85,100,000 |

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