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Share-based payments - Additional information (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
shares
Jun. 30, 2022
shares
Dec. 31, 2021
Options
shares
Dec. 31, 2020
Options
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of warrants issued but not exercised | shares 21,265,146 19,265,136 21,265,146  
Number of share options granted in share-based payment arrangement | Options     3,147 16,817
Marcus Waley Cohen        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of warrants issued but not exercised | shares     2,000,000  
Number of share options granted in share-based payment arrangement | Options     2,000,000