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Net loss per share per share - Securities excluded from the diluted per share calculation (Details) - shares
9 Months Ended
Mar. 07, 2019
Sep. 30, 2020
Sep. 30, 2019
May 28, 2019
Antidilutive securities        
Antidilutive securities (in shares)   3,779,785 2,751,595  
Remaining warrants exercisable     80,000 80,000
Warrants to subscribe for convertible preferred shares (as adjusted to reflect the impact of the share capital reorganization and issuance of bonus shares        
Antidilutive securities        
Antidilutive securities (in shares)     114,320  
Percentage of warrants exercise in conjunction with IPO 50.00%      
Percentage of warrants expire 50.00%      
Number of ordinary shares for warrants exercise     114,320  
Options to purchase ordinary shares        
Antidilutive securities        
Antidilutive securities (in shares)   3,779,785 2,637,275