CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Royalty revenue from a related party, net of amortization for capitalized fees paid to a related party of $3,456 for the three months ended September 30, 2017 and 2016 and $10,368 for the nine months ended September 30, 2017 and 2016	$ 48,422	$ 33,088	$ 147,034	$ 89,294
Revenue from collaborative arrangements from a related party	221	221	663	663
Total net revenue	48,643	33,309	147,697	89,957
Operating expenses:
Research and development	311	286	1,013	1,048
General and administrative	8,310	5,105	29,489	17,582
Total operating expenses	8,621	5,391	30,502	18,630
Income from operations	40,022	27,918	117,195	71,327
Other (expense) income, net	(6,369)	56	(7,108)	1,743
Interest income	376	162	918	411
Interest expense	(10,262)	(13,103)	(35,247)	(39,416)
Net income	$ 23,767	$ 15,033	$ 75,758	$ 34,065
Basic net income per share	$ 0.22	$ 0.14	$ 0.71	$ 0.31
Diluted net income per share	$ 0.21	$ 0.13	$ 0.67	$ 0.31
Shares used to compute basic and diluted net income per share:
Shares used to compute basic net income per share	106,841	109,282	107,236	111,128
Shares used to compute diluted net income per share	119,796	121,993	120,120	111,583