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STOCKHOLDERS' EQUITY (Common Stock Warrants) (Details) - $ / shares | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Jul. 07, 2015 | Jun. 30, 2015 | Feb. 27, 2015 | Jan. 15, 2015 | Oct. 22, 2014 | Oct. 21, 2014 | Jan. 31, 2013 | Feb. 02, 2012
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock warrants issued (in shares) | 3,466,841 | 664,703 |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock expired | 431,027 |  |  |  |  |  |  |  |  |
Underlying Shares | 5,920,799 |  |  |  |  |  |  |  |  |
Exercise Price (in usd per share) | $ 10.25 | $ 10.25 | $ 6.50 | $ 7.56 | $ 7.56 | $ 9.59 | $ 10.86 | $ 11.73 | $ 12.96 | $ 15.00
Various Institutional Holders; February 2017 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Underlying Shares | 1,899,729 |  |  |  |  |  |  |  |  |
Exercise Price (in usd per share) | $ 6.50 |  |  |  |  |  |  |  |  |
Affiliates of Third Security, LLC; February 2017 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Underlying Shares | 288,448 |  |  |  |  |  |  |  |  |
Exercise Price (in usd per share) | $ 6.50 |  |  |  |  |  |  |  |  |
Various Institutional Holders; January 2018 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Underlying Shares | 441,655 |  |  |  |  |  |  |  |  |
Exercise Price (in usd per share) | $ 9 |  |  |  |  |  |  |  |  |
Affiliates of Third Security, LLC; January 2018 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Underlying Shares | 250,000 |  |  |  |  |  |  |  |  |
Exercise Price (in usd per share) | $ 9 |  |  |  |  |  |  |  |  |
Various Institutional Holders; April 2020 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Underlying Shares | 374,618 |  |  |  |  |  |  |  |  |
Exercise Price (in usd per share) | $ 4 |  |  |  |  |  |  |  |  |
Various Institutional Holders; February 2020 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Underlying Shares | 714,780 |  |  |  |  |  |  |  |  |
Exercise Price (in usd per share) | $ 2.24 |  |  |  |  |  |  |  |  |
Various Institutional Holders; December 2020 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Underlying Shares | 1,284,405 |  |  |  |  |  |  |  |  |
Exercise Price (in usd per share) | $ 1.66 |  |  |  |  |  |  |  |  |
Various Institutional Holders; December 2020 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Underlying Shares | 667,164 |  |  |  |  |  |  |  |  |
Exercise Price (in usd per share) | $ 0.01 |  |  |  |  |  |  |  |  |
Private Placement, Repricing Requirements |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock warrants issued (in shares) |  | 290,085 |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock warrants issued (in shares) | 800,492 |  |  |  |  |  |  |  |  |
Exercise Price (in usd per share) |  |  |  |  |  |  | $ 4.00 |  |  |
Offering |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock warrants issued (in shares) | 2,666,349 |  |  |  |  |  |  |  |  |

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