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Non-marketable equity securities (Tables) | 6 Months Ended
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Jun. 30, 2021
Non Marketable Securities [Abstract] |
Schedule of Non-marketable equity securities |
|  | December 31, |  |  | June 30, |
|  | 2020 |  |  | 2021 |
Cost |  | $ | - |  |  | $ | 1,393,491 |
Impairment |  |  | - |  |  |  | (691,748 | )
Carrying amount |  | $ | - |  |  | $ | 701,743 |

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