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STOCKHOLDERS' EQUITY (Common Stock Warrants) (Details) - $ / shares | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Jul. 07, 2015 | Jun. 30, 2015 | Feb. 27, 2015 | Jan. 15, 2015 | Dec. 31, 2014 | Oct. 22, 2014 | Oct. 21, 2014 | Jan. 31, 2013 | Jan. 24, 2013 | Feb. 02, 2012
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants issued (in shares) | 3,055,555 | 3,466,841 |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) | 1,387,685 | 1,387,685 | 2,188,177 | 1,881,396 | 1,881,396 | 1,483,161 | 1,309,785 | 1,309,785 | 1,212,665 | 1,097,600 | 691,656 | 948,333
Warrants to purchase shares of common stock expired |  | 431,027 |  |  |  |  |  |  |  |  |  |
Underlying Shares | 6,696,287 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ 10.25 | $ 10.25 | $ 6.50 | $ 7.56 | $ 7.56 | $ 9.59 | $ 10.86 | $ 10.86 | $ 11.73 | $ 12.96 |  | $ 15.00
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) | 2,280,517 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; February 2017 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 2,919,043 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ 4.23 |  |  |  |  |  |  |  |  |  |  |
Affiliates of Third Security, LLC; February 2017 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 443,233 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ 4.23 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; January 2018 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 441,655 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ 9 |  |  |  |  |  |  |  |  |  |  |
Affiliates of Third Security, LLC; January 2018 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  |  |  |  |  |  |  |  | 250,000 |
Underlying Shares | 250,000 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ 9 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; April 2020 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 374,618 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ 4 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; February 2020 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 714,780 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ 2.24 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; December 2020 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 122,433 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ 1.66 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; January 2021 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 1,161,972 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ 1.21 |  |  |  |  |  |  |  |  |  |  |
Affiliates of Third Security, LLC; January 2021 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 161,026 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ 1.21 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; January 2021 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 107,527 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ 1.21 |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants issued (in shares) | 1,174,099 | 800,492 |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  |  |  |  |  | 365,388 |  |  |  |
Common stock warrant, exercise price (in usd per share) |  |  |  |  |  |  |  | $ 4.00 |  |  |  |
Offering |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants issued (in shares) | 1,881,456 | 2,666,349 |  |  |  |  |  |  |  |  |  |

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- Definition Class of Warrant or Right, Number of Issued Warrants Expired + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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