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Stockholders' Equity - Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 22, 2016 | Nov. 25, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 500,000,000 | 500,000,000 |
Issuance of common stock, net of offering costs |  |  |  | $ 49,044 | $ 76,056
Proceeds from sale of common stock, net of offering costs |  |  | $ 0 | 49,044 | 76,056
Payments of stock issuance costs |  |  |  | $ 1,000 | $ 1,000
Private Placement |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) |  | 3,400,000 |  |  |
Proceeds from sale of common stock, net of offering costs |  | $ 74,800 |  |  |
Proceeds from issuance of common stock, net |  | $ 73,800 |  |  |
Bridge Loan | Rights Offering |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares subscribed but unissued | 4,000,000 |  |  |  |
Issuance of common stock, net of offering costs | $ 49,900 |  |  |  |
Proceeds from issuance of common stock, net | $ 49,000 |  |  |  |
Common Stock | Private Placement |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Price per share (in dollars per share) |  | $ 22.00 |  |  |
Payments of stock issuance costs |  | $ 1,000 |  |  |
Common Stock | Bridge Loan | Rights Offering |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Price per share (in dollars per share) | $ 12.25 |  |  |  |
Payments of stock issuance costs | $ 900 |  |  |  |

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