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Net loss per share per share - Securities excluded from the diluted per share calculation (Details) - shares
3 Months Ended
Mar. 07, 2019
Mar. 31, 2020
Mar. 31, 2019
May 28, 2019
Antidilutive securities        
Antidilutive securities (in shares)   3,726,338 13,982,986  
Remaining warrants exercisable   50,000   80,000
Convertible preferred shares (as converted to ordinary shares)        
Antidilutive securities        
Antidilutive securities (in shares)     11,647,529  
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)   71,450 1,347,953  
Percentage of warrants exercise in conjunction with IPO 50.00%      
Percentage of warrants expire 50.00%      
Number of ordinary shares for warrants exercise   71,450    
Restricted ordinary shares        
Antidilutive securities        
Antidilutive securities (in shares)     56,643  
Options to purchase ordinary shares        
Antidilutive securities        
Antidilutive securities (in shares)   3,654,888 930,861