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Nature of the business and basis of presentation - Initial public offering (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 28, 2019
shares
Mar. 28, 2019
$ / shares
shares
Jun. 30, 2019
shares
Sep. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Share capital reorganization and share split            
Offering expenses | $       $ 1.8 $ 8.4  
Ordinary Shares            
Share capital reorganization and share split            
Shares issued (in shares)       2,830,713 4,637,666  
Conversion of convertible preferred shares to ordinary shares (in shares)         11,647,529  
IPO            
Share capital reorganization and share split            
Shares issued (in shares)   4,333,333        
Share issue price | $ / shares   $ 14.00        
Proceeds from IPO, net | $           $ 56.4
Underwriting discounts and commissions | $           4.5
Offering expenses | $           $ 4.0
IPO | Ordinary Shares            
Share capital reorganization and share split            
Conversion of convertible preferred shares to ordinary shares (in shares) 11,647,529          
Conversion ratio 0.6997          
Over allotment option            
Share capital reorganization and share split            
Shares issued (in shares)     304,333      
At the market offering            
Share capital reorganization and share split            
Shares issued (in shares)           2,830,713
Offering expenses | $           $ 1.8