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Share based compensation - Share Options Issued (Details) - Share options - $ / shares
1 Months Ended 12 Months Ended
Aug. 31, 2021
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock based compensation (in shares) 5,150,000 230,000      
Exercise price (in dollars per share) $ 2.00 $ 35.00 $ 2.00 $ 0 $ 35.00
Share price (in dollars per share) $ 1.40 $ 28.40