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STOCKHOLDERS' EQUITY (Common Stock Warrants) (Details) - $ / shares | 3 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Jan. 06, 2016 | Jul. 07, 2015 | Feb. 27, 2015 | Jan. 15, 2015 | Dec. 31, 2014 | Oct. 22, 2014 | Oct. 21, 2014 | Jan. 24, 2013 | Dec. 31, 2012 | Feb. 02, 2012
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants issued (in shares) | 2,933,106 | 1,208,491 |  |  |  |  |  |  |  |  |  |
Underlying Shares | 8,853,905 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; February 2017 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 2,812,745 |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) | $ 4.39 |  |  |  |  |  |  |  |  |  |  |
Affiliates of Third Security, LLC; February 2017 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 427,082 |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) | $ 4.39 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; January 2018 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 441,655 |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) | $ 9 |  |  |  |  |  |  |  |  |  |  |
Affiliates of Third Security, LLC; January 2018 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 250,000 |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) | $ 9 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; April 2020 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 374,618 |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) | $ 4.00 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; February 2020 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 714,780 |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) | $ 2.24 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; December 2020 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 122,433 |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) | $ 1.66 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; December 2020 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 667,164 |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; January 2021 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 1,161,972 |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) | $ 1.21 |  |  |  |  |  |  |  |  |  |  |
Affiliates of Third Security, LLC; January 2021 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 161,026 |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) | $ 1.21 |  |  |  |  |  |  |  |  |  |  |
Various Institutional Holders; January 2021 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Underlying Shares | 1,720,430 |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) | $ 1.21 |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants issued (in shares) | 1,051,650 | 493,711 |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) |  |  | $ 4.39 | $ 6.50 | $ 7.56 | $ 9.59 | $ 10.25 | $ 10.86 | $ 11.73 | $ 12.96 | $ 15.00 | $ 15.00
Offering |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants issued (in shares) | 1,881,456 | 714,780 |  |  |  |  |  |  |  |  |  |

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- Definition Class of Warrant or Right, Number of Issued Warrants or Rights + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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