Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Revenues	$ 65,438		$ 77,584		$ 133,616		$ 153,071
Cost of sales:
Cost of sales	43,756		48,542		90,062		98,547
Amortization of purchased technology	2,218		2,391		4,435		4,833
Total cost of sales	45,974		50,933		94,497		103,380
Gross margin	19,464		26,651		39,119		49,691
Research and development	12,020		11,713		23,555		24,259
Selling, general and administrative	9,527		10,173		20,623		22,173
Intangible asset amortization	1,304		1,304		2,608		2,608
Restructuring and acquisition-related charges, net	(114)		1,039		1,156		2,483
Income (loss) from operations	(3,273)		2,422		(8,823)		(1,832)
Interest expense	(281)		(422)		(613)		(843)
Other income (expense), net	226		126		373		290
Income (loss) before income tax expense (benefit)	(3,328)		2,126		(9,063)		(2,385)
Income tax expense (benefit)	784		819		1,606		1,123
Net income (loss)	$ (4,112)		$ 1,307		$ (10,669)		$ (3,508)
Net income (loss) per share:
Basic (in dollars per share)	$ (0.14)		$ 0.05		$ (0.37)		$ (0.13)
Diluted (in dollars per share)	$ (0.14)	[1],[2]	$ 0.05	[1],[2]	$ (0.37)	[1],[2]	$ (0.13)	[1],[2]
Weighted average shares outstanding:
Basic (in shares)	28,669		26,759		28,570		26,708
Diluted (in shares)	28,669		28,256		28,570		26,708

[1] For the three months ended June 30, 2013 and 2012, 2.1 million and 3.5 million as-if converted shares associated with the Company's convertible senior notes were excluded from the calculation as their effect would have been anti-dilutive. For the six months ended June 30, 2013 and 2012, 2.4 million and 3.5 million as-if converted shares associated with the Company's convertible senior notes were excluded from the calculation as their effect would have been anti-dilutive

[2] (A)For the three months ended June 30, 2013, there were no remaining contingently issuable shares outstanding. For the six months ended June 30, 2013 and 2012, 30,000 and 1.3 million contingently issuable shares were excluded from the calculation as their effect would have been anti-dilutive.