COLLABORATIVE ARRANGEMENTS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Pipeline fees	$ 5,256	$ 1,660	$ 11,659	$ 1,660