SUBSEQUENT EVENTS (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2015
Subsequent Event [Line Items]
Upfront And Milestone Payments Made To Collaborative Partner	$ 86	$ 266
Contingent and regulatory milestone payments	$ 450	$ 450
Five Prime [Member]
Subsequent Event [Line Items]
Upfront And Milestone Payments Made To Collaborative Partner			$ 350
Contingent and regulatory milestone payments			$ 1,400