CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Revenue:
Royalties	$ 73,637		$ 66,222
Contract and other revenue	4,651		644
Total revenue	78,288		66,866
Operating costs and expenses:
Cost of revenue	10,022	[1]	6,534	[1]
Research and development	26,898	[1]	32,848	[1]
Marketing, general and administrative	18,820	[1]	25,122	[1]
Gain from sale of intellectual property	(170)		(1,285)
Restructuring charges	39		2,206
Gain from settlement	(510)		0
Total operating costs and expenses	55,099		65,425
Operating income (loss)	23,189		1,441
Interest income and other income (expense), net	13		(20)
Interest expense	(9,926)		(7,312)
Interest and other income (expense), net	(9,913)		(7,332)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	13,276		(5,891)
Provision for income taxes	5,472		4,511
Net income (loss)	$ 7,804		$ (10,402)
Net income (loss) per share:
Earnings Per Share, Basic	$ 0.07		$ (0.09)
Earnings Per Share, Diluted	$ 0.07		$ (0.09)
Weighted average shares used in per share calculation:
Basic (in shares)	113,590		111,599
Diluted (in shares)	116,629		111,599

[1] Includes stock-based compensation