Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenues	$ 192,742	$ 237,863	$ 286,096	[1]
Cost of sales:
Cost of sales	132,730	165,166	188,513	[1]
Amortization of purchased technology	8,210	8,559	9,544	[1]
Total cost of sales	140,940	173,725	198,057	[1]
Gross margin	51,802	64,138	88,039	[1]
Research and development	31,958	45,000	47,739	[1]
Selling, general and administrative	35,862	41,210	45,200	[1]
Intangible assets amortization	5,077	5,215	5,215	[1]
Impairment of goodwill	0	0	29,748	[1]
Restructuring and other charges, net	4,205	7,479	(117)	[1]
Loss from operations	(25,300)	(34,766)	(39,746)	[1]
Interest expense	(1,242)	(1,220)	(1,722)	[1]
Interest income	64	26	39	[1]
Other income	1,389	1,511	545	[1]
Loss before income tax expense	(25,089)	(34,449)	(40,884)	[1]
Income tax expense	2,492	14,955	2,590	[1]
Net loss	$ (27,581)	$ (49,404)	$ (43,474)	[1]
Net loss per share:
Basic	$ (0.79)	$ (1.72)	$ (1.60)	[1]
Diluted	$ (0.79)	$ (1.72)	$ (1.60)	[1]
Weighted average shares outstanding:
Basic	34,699	28,805	27,174	[1]
Diluted	34,699	28,805	27,174	[1]

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