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Stockholders' Equity - Common Stock (Details) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2017 | May 31, 2016 | Feb. 28, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 13, 2017
Common Stock |  |  |  |  |  |  |
Maximum aggregate offering price of securities available for sale |  |  |  |  |  |  | $ 250,000
Aggregate offering price stock sale |  | $ 60,000 |  |  |  |  |
Additional offering price stock sale authorized | $ 75,000 |  |  |  |  |  |
Net proceeds from sale of common stock |  |  |  | $ 51,025 | $ 13,946 | $ 188,840 |
Common Stock |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |
Shares Issued in Connection with Cantor Agreement (in shares) |  |  |  | 17,722,863 | 3,303,800 |  |
Aggregate gross offering price available |  |  |  | $ 67,600 |  |  |
Common stock issued (in shares) |  |  | 2,401,847 |  |  | 8,337,500 |
Net proceeds from sale of common stock |  |  | $ 6,100 |  |  |  |

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