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Stockholders' Equity - Additional Information (Details) - $ / shares
 3 Months Ended
Apr. 01, 2019
Jun. 30, 2019
Dec. 31, 2018
Stockholders' Equity [Line Items]      
Preferred stock, shares outstanding   0  
Common and prferred stocks, shares authorized 210,000,000    
Common stock, shares authorized 200,000,000 200,000,000 130,000,000
Common stock, par value $ 0.000005 $ 0.000005 $ 0.000005
Preferred stock, shares authorized 10,000,000 10,000,000 0
Preferred stock, par value $ 0.0001 $ 0.0001 $ 0.0001
Common Stock      
Stockholders' Equity [Line Items]      
Common stock issued upon conversion of convertible preferred stock or convertible promissory notes   2,921,461  
Initial Public Offering ("IPO") | Series A and Series B Convertible Preferred Stock      
Stockholders' Equity [Line Items]      
Preferred stock, shares outstanding 0    
Initial Public Offering ("IPO") | Common Stock | Convertible Notes Payable (2019 Notes)      
Stockholders' Equity [Line Items]      
Common stock issued upon conversion of convertible preferred stock or convertible promissory notes 2,921,461    
Initial Public Offering ("IPO") | Common Stock | Series A and Series B Convertible Preferred Stock      
Stockholders' Equity [Line Items]      
Common stock issued upon conversion of convertible preferred stock or convertible promissory notes 22,301,190