SHAREHOLDERS' EQUITY - Deferred Compensation Arrangement (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		1 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	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]	Dec. 31, 2013 Employees [Member]	Dec. 31, 2012 Employees [Member]	Dec. 31, 2013 Non Employee Members of Scientific Advisory Board [Member]	Dec. 31, 2012 Non Employee Members of Scientific Advisory Board [Member]
Deferred Compensation Arrangement with Employees and Non-Employees, Share-Based Payments [Line Items]
Shares issued (in shares)			31,301	22,568
Fair value of shares issued					$ 1,046	$ 435	$ 300	$ 300
Shares withheld for tax withholding obligations (in shares)					8,071	4,672
Fair value of shares withheld for tax withholding obligations	$ 2,700	$ 2,800			$ 271	$ 154