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Convertible Preferred Stock and Stockholders' Equity (Deficit) - Additional information (Details) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Mar. 21, 2018
Dec. 31, 2017
Class Of Stock [Line Items]        
Capital stock shares authorized 410,000,000      
Common stock, shares authorized 400,000,000 400,000,000 400,000,000  
Preferred stock, shares authorized 10,000,000 10,000,000 10,000,000  
Common stock, par value $ 0.0001 $ 0.0001 $ 0.0001  
Preferred stock, par value $ 0.0001 $ 0.0001 $ 0.0001  
Common Stock | IPO        
Class Of Stock [Line Items]        
Convertible preferred stock converted into common stock     30,459,574  
Convertible Preferred Stock        
Class Of Stock [Line Items]        
Convertible preferred stock, shares outstanding 0 0   30,459,574