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Net Income (Loss) Per Share - Summary of Common Stock Issuance (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 10, 2019 | Jun. 04, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Net proceeds |  |  | $ 73,781 | $ 0 | $ 122,668 | $ 0 |
First Offering |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Aggregate net proceeds from stock offering |  | $ 50,000 |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.01 |  |  |  |  |
Shares sold in offering |  | 16,630,444 |  |  |  |  |
Par value, common stock (in dollars per share) |  | $ 3.00 |  |  |  |  |
Net proceeds |  | $ 48,900 |  |  |  |  |
Second Offering |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Aggregate net proceeds from stock offering | $ 75,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |
Shares sold in offering | 14,219,677 |  |  |  |  |  |
Par value, common stock (in dollars per share) | $ 5.27 |  |  |  |  |  |
Net proceeds | $ 73,800 |  |  |  |  |  |

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