Trade and other payables - Schedule of accrued liabilities (Details) - USD ($) |
Dec. 31, 2022 |
Dec. 31, 2021 |
---|---|---|
Trade and other payables [abstract] | ||
External research and development fees | $ 3,531,996 | $ 3,062,844 |
Operational expenses | 92,783 | 412,008 |
Professional and other fees | 314,445 | 570,193 |
Accrued interest | 409,193 | 364,275 |
Severance | 0 | 46,026 |
Accrued liabilities | $ 4,348,417 | $ 4,455,346 |