Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues	$ 50,805	$ 54,109	$ 144,568	$ 187,725
Cost of sales:
Cost of sales	34,052	37,874	100,551	127,936
Amortization of purchased technology	2,056	2,069	6,165	6,504
Total cost of sales	36,108	39,943	106,716	134,440
Gross margin	14,697	14,166	37,852	53,285
Research and development	7,657	11,456	24,484	35,011
Selling, general and administrative	8,554	10,522	27,103	31,145
Intangible asset amortization	1,260	1,303	3,817	3,911
Restructuring and acquisition-related charges, net	1,329	2,881	3,444	4,037
Income (loss) from operations	(4,103)	(11,996)	(20,996)	(20,819)
Interest expense	(317)	(300)	(949)	(913)
Other income (expense), net	463	200	799	573
Income (loss) before income tax expense (benefit)	(3,957)	(12,096)	(21,146)	(21,159)
Income tax expense (benefit)	512	624	1,968	2,230
Net income (loss)	$ (4,469)	$ (12,720)	$ (23,114)	$ (23,389)
Net income (loss) per share:
Basic (in dollars per share)	$ (0.12)	$ (0.44)	$ (0.68)	$ (0.82)
Diluted (in dollars per share)	$ (0.12)	$ (0.44)	$ (0.68)	$ (0.82)
Weighted average shares outstanding:
Basic (in shares)	36,332	28,931	34,097	28,692
Diluted (in shares)	36,332	28,931	34,097	28,692