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Convertible loan notes (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 15, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]        
Change in fair value of conversion and redemption features embedded in the convertible loan notes   $ 3 $ 5,994 $ 3
Loss on extinguishment of convertible loan notes     (13,789)  
Convertible loan notes        
Debt Instrument [Line Items]        
Interest expense recognized     2,650 969
Change in fair value of conversion and redemption features embedded in the convertible loan notes     $ 5,994 $ 3
Loss on extinguishment of convertible loan notes $ 2,125      
Series B redeemable convertible preferred shares | Convertible loan notes        
Debt Instrument [Line Items]        
Shares issued on conversion | shares 12,421   12,421  
Conversion price, multiplier 0.8      
Fair value of shares issued on conversion     $ 53,721  
Loss on extinguishment of convertible loan notes     13,789  
Carrying amounts of the convertible loan notes     25,557  
Conversion and redemption feature liability     $ 14,375