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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Subsequent Events |  |  |  |
Share price (in dollars per share) |  | $ 0.001 |  |
Additional common stock issued |  | $ 8,036 | $ 11,994 | $ 61,744
Common Stock |  |  |  |
Subsequent Events |  |  |  |
Number of shares issued |  | 4,804,796 | 3,243,015 | 5,750,000
Additional common stock issued |  | $ 5 | $ 3 | $ 5
Second ATM Program | Common Stock | Subsequent Events |  |  |  |
Subsequent Events |  |  |  |
Number of shares issued | 5,390,255 |  |  |
Share price (in dollars per share) | $ 1.59 |  |  |
Additional common stock issued | $ 8,600 |  |  |
Net proceeds | $ 8,300 |  |  |
Second ATM Program | Cowen | Common Stock | Subsequent Events |  |  |  |
Subsequent Events |  |  |  |
Number of shares issued | 5,390,255 |  |  |
Share price (in dollars per share) | $ 1.59 |  |  |
Additional common stock issued | $ 8,600 |  |  |
Net proceeds | $ 8,300 |  |  |

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