SHAREHOLDERS' EQUITY - Deferred Compensation Arrangement (Details) (USD $)	12 Months Ended			1 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 Employees and Non Employee Members of Scientific Advisory Board [Member]	Mar. 31, 2012 Employees and Non Employee Members of Scientific Advisory Board [Member]	Jan. 31, 2011 Employees and Non Employee Members of Scientific Advisory Board [Member]	Dec. 31, 2013 Employees [Member]	Dec. 31, 2012 Employees [Member]	Dec. 31, 2011 Employees [Member]	Dec. 31, 2013 Non Employee Members of Scientific Advisory Board [Member]	Dec. 31, 2012 Non Employee Members of Scientific Advisory Board [Member]	Dec. 31, 2011 Non Employee Members of Scientific Advisory Board [Member]
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items]
Common stock from warrant exercises (in shares)			586,972
Proceeds from warrant exercises			$ 7,400,000
Shares issued (in shares)				22,568	16,866	59,472
Fair value of shares issued							435,000	376,000	1,800,000	300,000	300,000	300,000
Shares withheld for tax withholding obligations (in shares)							4,672	3,070	18,792
Fair value of shares withheld for tax withholding obligations	$ 2,800,000	$ 3,500,000	$ 3,400,000				$ 154,000	$ 124,000	$ 655,000