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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 10, 2019 | Jan. 31, 2019 | Sep. 30, 2019 | Oct. 11, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Subsidiary Sale Of Stock [Line Items] |  |  |  |  |  |
Net proceeds from sale of convertible preferred stock |  |  | $ 317,335 |  |  |
IPO |  |  |  |  |  |
Subsidiary Sale Of Stock [Line Items] |  |  |  |  |  |
Convertible preferred stock, shares outstanding | 88,112,733 |  |  | 0 |  |
Series B Convertible Preferred Stock |  |  |  |  |  |
Subsidiary Sale Of Stock [Line Items] |  |  |  |  |  |
Convertible preferred stock, shares sold |  | 18,202,213 | 18,202,213 |  |  |
Convertible preferred stock, shares sold, price per share |  | $ 18.00 |  |  |  |
Net proceeds from sale of convertible preferred stock |  | $ 327,500 |  |  |  |
Convertible preferred stock, additional shares authorized |  | 4,020,009 |  |  |  |
Convertible Preferred Stock |  |  |  |  |  |
Subsidiary Sale Of Stock [Line Items] |  |  |  |  |  |
Convertible preferred stock, shares outstanding |  |  | 88,112,733 |  | 88,112,733 | 69,910,520
Convertible Preferred Stock | IPO | Common Stock |  |  |  |  |  |
Subsidiary Sale Of Stock [Line Items] |  |  |  |  |  |
Number of convertible preferred stock converted to shares of common stock (in shares) | 88,112,733 |  |  |  |  |

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