LIABILITY RELATED TO SALE OF FUTURE ROYALTIES (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Oct. 18, 2013	Dec. 31, 2014	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2015
Future royalties liability
Non-cash PDL royalty revenue			$ 33,297	$ 76,081
Non-cash interest expense recognized			4,903	10,282
Liability related to sale of future royalties
Future royalties liability
Non-cash PDL royalty revenue		$ 147,000	33,300	76,100
Effective interest rate (as a percent)					10.00%
Non-cash interest expense recognized			$ 4,900	$ 10,300
Liability related to sale of future royalties | PDL BioPharma
Future royalties liability
Royalty and milestone payments received	$ 240,500