CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue:
Royalty revenue from a related party, net of amortization for capitalized fees paid to a related party of $3,456 and $3,455 for the three months ended September 30, 2016 and 2015 and $10,368 and $10,367 for the nine months ended September 30, 2016 and 2015	$ 33,088	$ 13,341	$ 89,294	$ 30,449
Revenue from collaborative arrangements from a related party, net	221	221	663	664
Total net revenue	33,309	13,562	89,957	31,113
Operating expenses:
Research and development	286	547	1,048	1,897
General and administrative	5,105	4,581	17,582	14,929
Total operating expenses	5,391	5,128	18,630	16,826
Income from operations	27,918	8,434	71,327	14,287
Other income (expense), net	56	(45)	1,743	1,117
Interest income	162	90	411	291
Interest expense	(13,103)	(13,063)	(39,416)	(38,756)
Net income (loss)	$ 15,033	$ (4,584)	$ 34,065	$ (23,061)
Basic net income (loss) per share:	$ 0.14	$ (0.04)	$ 0.31	$ (0.20)
Diluted net income (loss) per share:	$ 0.13	$ (0.04)	$ 0.31	$ (0.20)
Shares used to compute basic and diluted net income (loss) per share:
Shares used to compute basic net income (loss) per share	109,282	115,787	111,128	115,381
Shares used to compute diluted net income (loss) per share	121,993	115,787	111,583	115,381
Cash dividend declared per common share (in dollars per share)	$ 0.00	$ 0.25	$ 0.00	$ 0.75