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Share-based compensation (Details)
1 Months Ended 6 Months Ended
Jun. 30, 2020
installment
shares
May 31, 2019
shares
Jun. 30, 2023
installment
shares
Jan. 01, 2023
shares
Dec. 31, 2022
shares
Jun. 27, 2022
shares
Jan. 01, 2022
shares
Stock option              
Share-based compensation.              
Shares outstanding     7,306,927   5,898,888    
Employee Share Purchase Plan              
Share-based compensation.              
Number of shares reserved for issuance             298,738
Percentage of annual increase in reserves on total number of ordinary shares outstanding   1.00%          
Number of ordinary shares reserved for issuance   215,000 1,200,413        
Number of shares available for issuance   430,000          
2020 Plan              
Share-based compensation.              
Number of shares reserved for issuance 4,773,557   860,637 1,493,694   750,000  
Shares issued (in shares) 574,679            
Percentage of annual increase in reserves on total number of ordinary shares outstanding 5.00%            
2020 Plan | Stock option              
Share-based compensation.              
Shares outstanding     4,595,604        
Contractual life 10 years            
2020 Plan | Stock option | Non-employee Director              
Share-based compensation.              
Vesting period 3 years            
Number of equal quarterly installments for vesting remaining awards | installment     4        
Service period     1 year        
2020 Plan | Stock option | First anniversary              
Share-based compensation.              
Vesting Percentage 25.00%            
2020 Plan | Stock option | Employee              
Share-based compensation.              
Vesting period 4 years            
2020 Plan | Stock option | Employee | Remaining equal installments              
Share-based compensation.              
Number of equal monthly installments for vesting remaining awards | installment 36            
2020 Plan | Restricted ordinary shares              
Share-based compensation.              
Vesting period     4 years        
Right to receive upon vesting     1        
Service period     1 year        
Number of quarterly installments | installment     4        
RSUs outstanding under the 2020 Plan.     402,970   187,725    
2020 Plan | Restricted ordinary shares | First anniversary              
Share-based compensation.              
Vesting Percentage     25.00%        
2020 Plan | Restricted ordinary shares | Remaining equal installments              
Share-based compensation.              
Number of equal quarterly installments for vesting remaining awards | installment     12        
2019 Plan              
Share-based compensation.              
Number of shares reserved for issuance 544,866            
2019 Plan | Stock option              
Share-based compensation.              
Shares outstanding 3,654,012   2,121,705        
Contractual life     10 years        
2019 Plan | Minimum | Stock option              
Share-based compensation.              
Vesting period     3 years        
2019 Plan | Maximum | Stock option              
Share-based compensation.              
Vesting period     4 years        
Pre-IPO Share Options and restricted shares | Stock option | First anniversary              
Share-based compensation.              
Vesting Percentage     25.00%        
Pre-IPO Share Options and restricted shares | Stock option | Remaining equal installments              
Share-based compensation.              
Number of equal monthly installments for vesting remaining awards | installment     36