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Summary of Significant Accounting Policies - Summary of Outstanding Potentially Dilutive Shares Excluded from Calculation of Diluted Net Loss Per Share (Details)
9 Months Ended
Sep. 30, 2019
shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Anti-dilutive shares of stock 3,629,859
Options to Purchase Common Stock  
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Anti-dilutive shares of stock 3,206,812
Common Stock Subject to Repurchase  
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]  
Anti-dilutive shares of stock 423,047