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Stockholder's equity (deficit) - Common stock (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 24, 2019
USD ($)
$ / shares
shares
Mar. 31, 2020
Vote
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Jun. 30, 2019
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   28,671,222 28,567,837    
Common stock, shares outstanding   28,671,222 28,567,837    
Common stock were reserved for issuance          
Options available for future grant   6,462,856 5,137,850    
Options to purchase common stock          
Common stock were reserved for issuance          
Options available for future grant   2,812,364 1,771,931    
2018 Stock option and grant plan          
Common stock were reserved for issuance          
Options available for future grant   2,193,592 2,296,029 107,635 107,635
2019 Stock Option and Incentive plan          
Common stock were reserved for issuance          
Options available for future grant   901,858 800,526    
2019 Employee Stock Purchase Plan          
Common stock were reserved for issuance          
Options available for future grant   555,042 269,364    
IPO          
Class of Stock          
Common stock, shares issued 6,612,500        
Proceeds received, net of underwriting discounts and commissions | $ $ 98,394        
Offering costs | $ $ 2,942        
Number of shares converted 21,056,136        
Over allotment          
Class of Stock          
Public offering price | $ / shares $ 16.00        
Over allotment | Maximum          
Class of Stock          
Common stock, shares issued 862,500