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Stockholders' Equity (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | May 31, 2016
Stockholders' Equity |  |  |
Net proceeds from sale of common stock | $ 21,489 | $ 2,551 |
Cantor agreement |  |  |
Stockholders' Equity |  |  |
Common stock issued (in shares) | 6,731,066 |  |
Net proceeds from sale of common stock | $ 21,500 |  |
Aggregate gross offering price available | $ 23,100 |  |
Cantor agreement | Maximum |  |  |
Stockholders' Equity |  |  |
Aggregate offering price of common stock |  |  | $ 60,000

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