CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Revenue:
Royalties		$ 62,877	$ 66,963
Contract and other revenue		9,805	5,951
Total revenue		72,682	72,914
Operating costs and expenses:
Cost of revenue	[1]	12,207	10,756
Research and development	[1]	28,527	28,534
Sales, general and administrative	[1]	23,095	18,502
Gain from sale of intellectual property		0	(2,260)
Gain from settlement		(441)	(510)
Total operating costs and expenses		63,388	55,022
Operating income (loss)		9,294	17,892
Interest income and other income (expense), net		242	132
Interest expense		(3,141)	(3,083)
Interest and other income (expense), net		(2,899)	(2,951)
Income before income taxes		6,395	14,941
Provision for (benefit from) income taxes		4,517	5,439
Net Income (Loss)		$ 1,878	$ 9,502
Net income per share:
Earnings Per Share, Basic		$ 0.02	$ 0.08
Earnings Per Share, Diluted		$ 0.02	$ 0.08
Weighted average shares used in per share calculation:
Basic (in shares)		109,733	115,336
Diluted (in shares)		112,252	117,442

[1] Includes stock-based compensation