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Stockholder's equity (deficit) - Common stock (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
May 18, 2021
USD ($)
shares
Jul. 10, 2020
USD ($)
$ / shares
shares
Jun. 24, 2019
USD ($)
$ / shares
shares
Sep. 30, 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    
Cash dividend paid | $ / shares       $ 0    
Common stock, shares issued       34,875,302 34,741,649  
Common stock, shares outstanding       34,875,302 34,741,649  
Common stock were reserved for issuance            
Options available for future grant       13,008,247 6,404,819  
Options available for future grant            
Common stock were reserved for issuance            
Options available for future grant       3,094,946 2,127,544  
Common stock available for ATM program            
Common stock were reserved for issuance            
Options available for future grant 5,000,000     5,000,000    
2018 Stock option and grant plan            
Common stock were reserved for issuance            
Options available for future grant       2,028,496 2,148,019 107,635
2019 Stock Option and Incentive plan            
Common stock were reserved for issuance            
Options available for future grant       2,003,556 1,585,293  
2019 Employee Stock Purchase Plan            
Common stock were reserved for issuance            
Options available for future grant       881,249 543,963  
Maximum | Common stock available for ATM program            
Class of Stock            
Share Issued value under agreement | $ $ 100,000          
IPO            
Class of Stock            
Share Issued under agreement     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            
Share Issued under agreement   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            
Share Issued under agreement   784,224 862,500