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Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended
--- | --- | ---
Nov. 26, 2014 | Jun. 30, 2015
Class Of Stock [Line Items] |  |
Noncash exercise provision threshold |  | 120 days
Restricted common stock issued |  | 30,000
Common stock shares issued upon vesting of restricted stock units |  | 853,365
Shares withheld |  | 206,380
Shares issued during period |  | $ 120
Common Stock |  |
Class Of Stock [Line Items] |  |
Equity issuance unit | 1 |
Common stock shares issued upon conversion from preferred stock |  | 242
Warrant |  |
Class Of Stock [Line Items] |  |
Equity issuance unit | 1 |
Volatility rate |  | 135.00%
Secondary Offering |  |
Class Of Stock [Line Items] |  |
Common stock shares, issued | 11,441,646 |
Common stock share issue price under offering, per share price | $ 1.14 |
Exercise price of warrants (in usd per share) | $ 1.48 |
Secondary Offering Warrant |  |
Class Of Stock [Line Items] |  |
Warrants exercised |  | 13,015,912
Class of warrant outstanding |  | 141,980
Cash to exercise warrants |  | $ 112
Outstanding warrants exercisable |  | 190,591
Secondary Offering Warrant | Underwriter Option |  |
Class Of Stock [Line Items] |  |
Common stock shares, issued | 1,716,246 |
Secondary Offering Warrant | Common Stock |  |
Class Of Stock [Line Items] |  |
Warrants converted into shares of common stock |  | 38,147,958

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