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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jan. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity [Abstract] |  |  |  |  |
Common stock issued (in shares) | 8,222,500 | 2,645,000 |  |  |
Common stock issue price (in dollars per share) | $ 7.00 | $ 50.00 |  |  |
Number of shares issued upon full exercise of options granted to underwriters (in shares) | 1,072,500 | 345,000 |  |  |
Net proceeds from private placement | $ 53,900 | $ 124,100 | $ 0 | $ 53,925 | $ 124,063
Outstanding stock options (in shares) |  |  | 5,746 | 4,611 |
Outstanding restricted stock units (in shares) |  |  | 0 | 50 |

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