LIABILITY RELATED TO SALE OF FUTURE ROYALTIES (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 18, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Future royalties liability
Royalty and milestone payments received				$ 240,500
Effective interest rate (as a percent)					10.00%
Non-cash PDL royalty revenue			$ 242,808	18,104
Non-cash interest expense on PDL liability			14,646	$ 4,488
Liability related to sale of future royalties
Future royalties liability
Non-cash PDL royalty revenue		$ 147,000	242,800
Non-cash interest expense on PDL liability			$ 14,600
Liability related to sale of future royalties | PDL BioPharma
Future royalties liability
Royalty and milestone payments received	$ 240,500