CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenue:
Product	$ 227,308		$ 203,487		$ 174,234
Licensing	49,098		48,877		46,775
Total revenue	276,406		252,364		221,009
Cost of revenue and operating expenses:
Cost of product revenue	112,940	[1],[2],[3]	109,815	[1],[2],[3]	90,035	[1],[2],[3]
Cost of licensing revenue	881		626		794
Research and development	76,994	[3]	77,372	[3]	66,533	[3]
Selling, general and administrative	64,736	[3]	57,446	[3]	55,277	[3]
Restructuring expense	1,783		110		2,269
Amortization of acquisition-related intangible assets	941		599		1,585
Impairment of intangible asset	175				8,500
Total cost of revenue and operating expenses	258,450		245,968		224,993
Income (loss) from operations	17,956		6,396		(3,984)
Proceeds from legal settlement	1,275
Other than temporary impairment of a privately-held company investment	(1,500)		(7,467)
Interest income and other, net	1,203		1,661		1,918
Income (loss) before provision for income taxes and equity in net loss of an unconsolidated affiliate	18,934		590		(2,066)
Income tax expense	6,955		9,979		8,583
Equity in net loss of an unconsolidated affiliate	489		1,803		994
Net income (loss)	$ 11,490		$ (11,192)		$ (11,643)
Net income (loss) per share – basic	$ 0.15		$ (0.14)		$ (0.14)
Net income (loss) per share – diluted	$ 0.15		$ (0.14)		$ (0.14)
Weighted average shares – basic	77,399		81,872		80,603
Weighted average shares – diluted	79,065		81,872		80,603

[1] Includes restructuring expense

[2] Includes amortization of acquisition-related intangible assets

[3] Includes stock-based compensation expense