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Stockholders' equity - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Aug. 05, 2020
USD ($)
shares
Jul. 28, 2020
USD ($)
$ / shares
shares
Jul. 20, 2020
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Class Of Stock [Line Items]            
Issuance of common stock from initial public offering | $       $ 210,699    
Proceeds from initial public offering, net of underwriting discount | $         $ 213,660  
Common stock, shares authorized       150,000,000 150,000,000 50,000,000
Common stock, par value | $ / shares       $ 0.001 $ 0.001 $ 0.001
Preferred Stock Shares Authorized       10,000,000 10,000,000 0
Preferred Stock, par value | $ / shares       $ 0.001 $ 0.001 $ 0.001
Common stock, voting rights   Each share of common stock entitles the holders to one vote on all matters submitted to a vote of the Company’s stockholders.        
IPO            
Class Of Stock [Line Items]            
Capital units, authorized   160,000,000        
Common stock, shares authorized   150,000,000        
Common stock, par value | $ / shares   $ 0.001        
Preferred Stock Shares Authorized   10,000,000        
Preferred Stock, par value | $ / shares   $ 0.001        
Common stock            
Class Of Stock [Line Items]            
Reverse stock split     On July 20, 2020, the Company effected a 1-for-3.3115 reverse stock split of the Company’s common stock      
Reverse stock split, conversion ratio     0.30      
Issuance of common stock from initial public offering, shares       12,091,675    
Issuance of common stock from initial public offering | $       $ 12    
Convertible Preferred Stock, Shares Issued upon Conversion   22,460,076        
Common stock | IPO            
Class Of Stock [Line Items]            
Issuance of common stock from initial public offering, shares   10,586,316        
Issuance of common stock from initial public offering | $   $ 201,100        
Proceeds from initial public offering, net of underwriting discount | $   $ 184,100        
Underwriters exercise option to purchase additional shares of common stock 1,505,359          
Net proceeds after deducting commissions from underwriter purchase of additional share of common stock | $ $ 26,600