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Common Stock - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Class of Stock [Line Items] |  |  |
Net proceeds after offering costs from sale of common stock |  | $ 206,626 | $ 300,000
Public Underwritten Offering |  |  |
Class of Stock [Line Items] |  |  |
Common stock issued and sold in public underwritten offering (in shares) | 41,325,000 |  |
Net proceeds after offering costs from sale of common stock | $ 196,500 |  |

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