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