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Common Stock and Related Matters - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016 | Sep. 20, 2018 | Mar. 31, 2018 | May 09, 2017
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 689,000,000.0 |  |  |  |
Warrants exercised (in shares) |  |  |  | 19,983,843 |  |  |
Warrants remaining |  |  |  |  |  | 99,888 |
Common Stock [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 13,844,000 |  |  |  |
Exercise of warrants - share settled (in shares) |  |  |  | 11,336,856 |  | 58,814 |
2017 ATM Program [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Amount of common stock authorized under equity distribution agreement |  |  |  |  |  |  | $ 750,000,000.0
Equity Distribution Agreement May 2017 [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Issuance of common stock (in shares) | 0 | 0 | 7,527,902 |  |  |  |
Proceeds from issuance of common stock |  |  | $ 364,900,000 |  |  |  |
Amount of common stock authorized under equity distribution agreement | $ 382,100,000 |  |  |  |  |  |
2018 ATM Program [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Amount of common stock authorized under equity distribution agreement |  |  |  |  | $ 750,000,000.0 |  |
Equity Distribution Agreement September 2018 [Member] |  |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |  |
Issuance of common stock (in shares) | 0 | 0 |  |  |  |  |
Amount of common stock authorized under equity distribution agreement | $ 750,000,000.0 |  |  |  |  |  |

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