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Net loss per share - Securities excluded from the diluted per share calculation (Details) - shares
3 Months Ended 9 Months Ended
Mar. 07, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
May 28, 2019
Antidilutive securities            
Antidilutive securities (in shares)   2,751,595 12,084,507 2,751,595 12,084,507  
Remaining warrants exercisable           80,000
Convertible preferred shares (as converted to ordinary shares)            
Antidilutive securities            
Antidilutive securities (in shares)     9,641,740   9,641,740  
Warrants to subscribe for convertible preferred shares (as adjusted to reflect the impact of the share capital reorganization and issuance of bonus shares (Note 1))            
Antidilutive securities            
Antidilutive securities (in shares)   114,320 1,347,953 114,320 1,347,953  
Percentage of warrants exercise in conjunction with IPO 50.00%          
Percentage of warrants expire 50.00%          
Remaining warrants exercisable   80,000   80,000    
Number of ordinary shares for warrants exercise   114,320   114,320    
Restricted shares            
Antidilutive securities            
Antidilutive securities (in shares)     123,735   123,735  
Options to purchase ordinary shares            
Antidilutive securities            
Antidilutive securities (in shares)   2,637,275 971,079 2,637,275 971,079