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Stockholders’ Equity - Equity Distribution Agreements (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 27, 2019 | Mar. 29, 2019 | Sep. 10, 2018 | Aug. 10, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |  |  |  |  |
Stock issued (in shares) | 30,900,000 | 15,890,000 |  |  |  |  |
Proceeds from issuance of common stock | $ 804,398 | $ 260,091 | $ 930 |  |  |  |
Equity Distribution Agreements |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  | $ 0.01
Common stock subscriptions (up to) |  |  |  |  |  | $ 177,100 | $ 100,000
Stock issued (in shares) | 2,260,200 | 14,588,631 |  |  |  |  |
Sale of stock, Price per share (in dollars per share) | $ 6.12 |  |  |  |  |  |
Proceeds from issuance of common stock | $ 13,600 | $ 89,000 |  |  |  |  |
Common stock reserved for future issuance | $ 72,500 |  |  |  |  |  |
Equity Distribution Agreements | Minimum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Sale of stock, Price per share (in dollars per share) |  | $ 6.19 |  |  |  |  |
Preferred Equity Distribution Agreement |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock issued (in shares) | 1,972,888 |  |  |  |  |  |
Preferred Stock, value, subscriptions (up to) |  |  |  | $ 131,500 | $ 50,000 |  |
Preferred Equity Distribution Agreement | Minimum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Sale of stock, Price per share (in dollars per share) | $ 24.88 |  |  |  |  |  |

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