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Stockholders' Equity - Additional Information (Details) - $ / shares |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2019 | Jun. 30, 2019 | Sep. 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 |  |  |

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