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STOCKHOLDERS' EQUITY (Common Stock Warrants) (Details)	3 Months Ended
STOCKHOLDERS' EQUITY (Common Stock Warrants) (Details)	Mar. 31, 2015	Mar. 31, 2014	Feb. 27, 2015	Jan. 15, 2015	Dec. 31, 2014	Oct. 22, 2014	Oct. 21, 2014	Feb. 02, 2012
Class of Stock [Line Items]
Common stock warrants issued (in shares)	1,208,491	115,432
Underlying Shares	4,093,477
Exercise Price (in dollars per share)			7.56	9.59	10.25	10.86	11.73
Affiliates of Third Security, LLC; December 2015
Class of Stock [Line Items]
Underlying Shares	431,027
Exercise Price (in dollars per share)	6.96
Various Institutional Holders; February 2017
Class of Stock [Line Items]
Underlying Shares	1,633,390
Exercise Price (in dollars per share)	7.56
Affiliates of Third Security, LLC; February 2017
Class of Stock [Line Items]
Underlying Shares	248,006
Exercise Price (in dollars per share)	7.56
Various Institutional Holders; January 2018
Class of Stock [Line Items]
Underlying Shares	441,656
Exercise Price (in dollars per share)	9.00
Affiliates of Third Security, LLC; January 2018
Class of Stock [Line Items]
Underlying Shares	250,000
Exercise Price (in dollars per share)	9.00
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
Private Placement
Class of Stock [Line Items]
Common stock warrants issued (in shares)	493,711
Exercise Price (in dollars per share)								15.00
Offering
Class of Stock [Line Items]
Common stock warrants issued (in shares)	717,780