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Stockholders' Equity - Common Stock Follow-On Offering (Details) - USD ($) $ in Thousands, shares in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Sep. 16, 2015 | Sep. 11, 2015 | Sep. 30, 2015 | Sep. 30, 2014
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized |  | 1.5 |  |
Proceeds from issuances of common stock, net | $ 23,576 |  | $ 23,576 | $ 5,952
Selling Stockholders [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized |  | 1.5 |  |

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