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Non-marketable equity securities (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
Non Marketable Securities [Abstract] |
Schedule of Non-marketable equity securities |
|  | December 31, |  |  | September 30, |
|  | 2020 |  |  | 2021 |
Cost |  | $ | - |  |  | $ | 1,396,076 |
Impairment |  |  | - |  |  |  | (693,269 | )
Carrying amount |  | $ | - |  |  | $ | 702,807 |

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