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Trade and other payables - Schedule of accrued liabilities (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Trade and other payables [abstract]    
External research and development fees $ 3,062,844 $ 248,898
Operational expenses 412,008 229,758
Professional fees 570,193 435,244
Accrued interest 364,275 349,566
Severance 46,026 166,662
Bonus 0 192,099
Accrued liabilities $ 4,455,346 $ 1,622,227