CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue:
Royalty revenue from a related party, net of amortization for capitalized fees paid to a related party of $3,456 and $3,456 for the three months ended June 30, 2016 and 2015 and $6,912 and $ 6,912 for the six months ended June 30, 2016 and 2015	$ 32,251	$ 10,434	$ 56,206	$ 17,108
Revenue from collaborative arrangements from a related party, net	221	221	442	443
Total net revenue	32,472	10,655	56,648	17,551
Operating expenses:
Research and development	370	638	762	1,350
General and administrative	6,225	4,909	12,477	10,348
Total operating expenses	6,595	5,547	13,239	11,698
Income from operations	25,877	5,108	43,409	5,853
Other income (expense), net	1,719	(16)	1,687	1,162
Interest income	157	85	249	201
Interest expense	(13,156)	(12,987)	(26,313)	(25,693)
Net income (loss)	$ 14,597	$ (7,810)	$ 19,032	$ (18,477)
Basic and diluted net income (loss) per share	$ 0.13	$ (0.07)	$ 0.17	$ (0.16)
Shares used to compute basic and diluted net income (loss) per share:
Shares used to compute basic net income (loss) per share	111,359	115,329	112,005	115,096
Shares used to compute diluted net income (loss) per share	124,316	115,329	112,531	115,096
Cash dividend declared per common share (in dollars per share)	$ 0	$ 0.25	$ 0	$ 0.50