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Stockholders' Equity - Common Stock (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 22, 2016 USD ($) $ / shares shares | Nov. 25, 2015 USD ($) $ / shares shares | Jan. 29, 2014 $ / shares | Aug. 31, 2014 USD ($) shares | Jul. 31, 2014 $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  | 0.1 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01 |  |  | $ 0.01 | $ 0.01 |
Stock issued in a private transaction, net of offering cost |  |  |  |  |  | $ 49,044 | $ 76,056 | $ 103,949
Offering costs |  |  |  |  |  |  |  | 237
Proceeds from sale of common stock, net of offering costs |  |  |  | $ 101,500 |  | $ 49,044 | $ 76,056 | 103,949
Common stock, shares authorized (in shares) | shares |  |  |  |  |  | 500,000,000 | 500,000,000 |
Stock price (in shares) | $ / shares |  |  |  |  |  |  | $ 23.54 |
Payments of stock issuance costs |  |  |  |  |  | $ 1,000 | $ 1,000 | $ 237
Transferable subscription right with respect to each share of common stock |  |  |  |  | 1 |  |  |
Conversion of stock, shares converted (in shares) | shares |  |  |  |  | 0.21 |  |  |
Subscription right exercise price | $ / shares |  |  |  |  | $ 16.00 |  |  |
Common stock, shares issued | shares |  |  |  | 6,400,000 |  | 45,533,913 | 41,009,924 |
Private Placement |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of common stock, net of offering costs |  | $ 74,800 |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  | 3,400,000 |  |  |  |  |  |
Stock price (in shares) | $ / shares |  | $ 22 |  |  |  |  |  |
Payments of stock issuance costs |  | $ 1,000 |  |  |  |  |  |
Proceeds from issuance of common stock, net |  | $ 73,800 |  |  |  |  |  |
Common Stock | Rights Offering |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock issued in a private transaction, net of offering cost | $ 49,900 |  |  |  |  |  |  |
Common Stock | Bridge Loan | Rights Offering |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares subscribed but unissued (in shares) | shares | 4,000,000 |  |  |  |  |  |  |
Price per share (in dollars per share) | $ / shares | $ 12.25 |  |  |  |  |  |  |
Offering costs | $ 900 |  |  |  |  |  |  |
Proceeds from sale of common stock, net of offering costs | $ 49,000 |  |  |  |  |  |  |
Conversion of stock, shares converted (in shares) | shares | 272,733 |  |  |  |  |  |  |

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