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Stockholder's equity (deficit) - Common stock (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Jul. 10, 2020
USD ($)
$ / shares
shares
Jun. 24, 2019
USD ($)
$ / shares
shares
Mar. 31, 2021
Vote
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Jun. 18, 2019
shares
Class of Stock          
Common stock, shares authorized     150,000,000 150,000,000  
Common stock, par value (in dollars per share) | $ / shares     $ 0.0001 $ 0.0001  
Number of votes per share | Vote     1    
Cash dividend declared | $ / shares     $ 0    
Common stock, shares issued     34,770,319 34,741,649  
Common stock, shares outstanding     34,770,319 34,741,649  
Common stock were reserved for issuance          
Options available for future grant     8,113,230 6,404,819  
Options to purchase common stock          
Common stock were reserved for issuance          
Options available for future grant     3,344,146 2,127,544  
2018 Stock option and grant plan          
Common stock were reserved for issuance          
Options available for future grant     2,119,349 2,148,019 107,635
2019 Stock Option and Incentive plan          
Common stock were reserved for issuance          
Options available for future grant     1,758,356 1,585,293  
2019 Employee Stock Purchase Plan          
Common stock were reserved for issuance          
Options available for future grant     891,379 543,963  
IPO          
Class of Stock          
Number of shares issued   6,612,500      
Public offering price | $ / shares   $ 16.00      
Proceeds received, net of underwriting discounts and commissions | $   $ 98,394      
Offering costs | $   $ 2,942      
Number of shares converted   21,056,136      
Follow Up Public Offering          
Class of Stock          
Number of shares issued 6,012,390        
Public offering price | $ / shares $ 36.00        
Proceeds received, net of underwriting discounts and commissions | $ $ 203,460        
Offering costs | $ $ 906        
Over allotment | Maximum          
Class of Stock          
Number of shares issued 784,224 862,500