Share-based payments - Summary of Warrants Granted (Parenthetical) (Details) - shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Warrants
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]
Number of ordinary share per warrant	27	27

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

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