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Share capital, share premium and other capital reserves - Preference share (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
tranche
shares
Dec. 31, 2020
USD ($)
tranche
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Share capital, share premium and other capital reserves        
Proceeds from Series C financing, net $ 61,798 $ 22,025    
Share split, conversion ratio 221      
Tranche one        
Share capital, share premium and other capital reserves        
Proceeds from issuance of shares net of cost of repurchase of stocks   $ 17,200    
Tranche two and three        
Share capital, share premium and other capital reserves        
Proceeds from issuance of shares net of cost of repurchase of stocks $ 56,600      
Common share        
Share capital, share premium and other capital reserves        
Number of shares obliged to repurchase | shares   331,500    
Common share | Tranche two and three        
Share capital, share premium and other capital reserves        
Number of shares obliged to repurchase | shares 165,750      
Series A Preference Shares        
Share capital, share premium and other capital reserves        
Shares issued | shares       1,755,845
Issue price | $ / shares       $ 0.68
Proceeds from Series C financing, net       $ 1,200
Number of shares obliged to repurchase | shares   1,436,500    
Amount of shares obliged to repurchase   $ 10,300    
Number of remaining tranches | tranche 2      
Series A Preference Shares | Tranche one        
Share capital, share premium and other capital reserves        
Number of shares obliged to repurchase | shares   718,250    
Amount of shares obliged to repurchase   $ 4,900    
Series A Preference Shares | Tranche two and three        
Share capital, share premium and other capital reserves        
Number of shares obliged to repurchase | shares 718,250      
Series B Preference Shares        
Share capital, share premium and other capital reserves        
Shares issued | shares     3,899,766  
Issue price | $ / shares     $ 4.61  
Proceeds from Series C financing, net     $ 17,900  
Series C Preference Shares        
Share capital, share premium and other capital reserves        
Proceeds from Series C financing, net   84,400    
Proceeds from issuance of shares net of issuance costs   $ 73,200    
Number of tranches | tranche 2 3    
Issuance costs $ 92 $ 647    
Series C Preference Shares | Tranche one        
Share capital, share premium and other capital reserves        
Shares issued | shares   4,133,805    
Proceeds from Series C financing, net   $ 22,700    
Issuance costs   $ 600