FINANCIAL INFORMATION Revised Consolidated Statements of Operations (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011		Jun. 30, 2012	Jun. 30, 2011
Net Discrete Tax Benefit	$ 200,000
Net revenues:
Products	123,026,000	129,488,000		242,964,000	266,234,000
Services	34,405,000	32,295,000		66,607,000	61,301,000
Total net revenues	157,431,000	161,783,000		309,571,000	327,535,000
Cost of revenues:
Products	66,642,000	64,024,000		127,850,000	127,888,000
Services	14,325,000	14,706,000		27,042,000	28,760,000
Amortization of intangible assets	644,000	685,000		1,294,000	1,351,000
Total cost of revenues	84,244,000	79,415,000		158,819,000	157,999,000
Gross profit	73,187,000	82,368,000		150,752,000	169,536,000
Operating expenses:
Research and development	26,896,000	30,453,000		54,377,000	60,426,000
Marketing and selling	43,454,000	45,867,000		89,380,000	90,917,000
General and administrative	13,905,000	14,219,000		28,796,000	29,219,000
Amortization of intangible assets	1,105,000	2,161,000		2,717,000	4,306,000
Restructuring costs (recoveries), net	15,841,000	162,000		16,009,000	(1,314,000)
Loss on sale of assets				9,951,000	597,000
Total operating expenses	111,152,000	93,459,000		200,978,000	184,151,000
Operating loss	(37,965,000)	(11,091,000)		(50,226,000)	(14,615,000)
Interest income	14,000	9,000		115,000	68,000
Interest expense	(405,000)	(594,000)		(720,000)	(1,016,000)
Other income (expense), net	12,000	(60,000)		32,000	3,000
Loss before income taxes	(38,344,000)	(11,736,000)		(50,799,000)	(15,560,000)
Provision for (benefit from) income taxes, net	903,000	(590,000)		1,426,000	367,000
Net loss	(39,247,000)	(11,146,000)		(52,225,000)	(15,927,000)
Net loss per common share - basic and diluted (in dollars per share)	$ (1.01)	$ (0.29)		$ (1.35)	$ (0.42)
As Reported [Member]
Net revenues:
Products		129,190,000			266,525,000
Services		32,154,000			61,142,000
Total net revenues		161,344,000			327,667,000
Cost of revenues:
Products		62,964,000	[1]		127,615,000	[1]
Services		15,312,000	[1]		29,699,000	[1]
Amortization of intangible assets		685,000			1,351,000
Total cost of revenues		78,961,000			158,665,000
Gross profit		82,383,000			169,002,000
Operating expenses:
Research and development		30,453,000			60,426,000
Marketing and selling		46,052,000			90,862,000
General and administrative		14,920,000			30,218,000
Amortization of intangible assets		2,161,000			4,306,000
Restructuring costs (recoveries), net		(163,000)			(2,379,000)
Loss on sale of assets		597,000			(597,000)
Total operating expenses		94,020,000			184,030,000
Operating loss		(11,637,000)			(15,028,000)
Interest income		9,000			68,000
Interest expense		(717,000)			1,139,000
Other income (expense), net		(60,000)			3,000
Loss before income taxes		(12,405,000)			(16,096,000)
Provision for (benefit from) income taxes, net		(543,000)			883,000
Net loss		(11,862,000)			(16,979,000)
Net loss per common share - basic		$ (0.31)			$ (0.44)
Net loss per common share - diluted		$ (0.31)			$ (0.44)
Weighted-average common shares outstanding - basic		38,413			38,323
Weighted-average common shares outstanding - diluted		38,413			38,323
As Revised [Member]
Net revenues:
Products		129,488,000			266,234,000
Services		32,295,000			61,301,000
Total net revenues		161,783,000			327,535,000
Cost of revenues:
Products		64,024,000	[1]		127,888,000	[1]
Services		14,706,000	[1]		28,760,000	[1]
Amortization of intangible assets		685,000			1,351,000
Total cost of revenues		79,415,000			157,999,000
Gross profit		82,368,000			169,536,000
Operating expenses:
Research and development		30,453,000			60,426,000
Marketing and selling		45,867,000			90,917,000
General and administrative		14,219,000			29,219,000
Amortization of intangible assets		2,161,000			4,306,000
Restructuring costs (recoveries), net		162,000			(1,314,000)
Loss on sale of assets		597,000			(597,000)
Total operating expenses		93,459,000			184,151,000
Operating loss		(11,091,000)			(14,615,000)
Interest income		9,000			68,000
Interest expense		(594,000)			1,016,000
Other income (expense), net		(60,000)			3,000
Loss before income taxes		(11,736,000)			(15,560,000)
Provision for (benefit from) income taxes, net		(590,000)			367,000
Net loss		$ (11,146,000)			$ (15,927,000)
Net loss per common share - basic		$ (0.29)			$ (0.42)
Net loss per common share - diluted		$ (0.29)			$ (0.42)
Weighted-average common shares outstanding - basic		38,413			38,323
Weighted-average common shares outstanding - diluted		38,413			38,323

[1] (a)The “As Reported” products and services cost of revenues amounts do not sum to the annual “As Reported” products and services cost of revenues amounts due to a reclassification made to the financial statements for the year ended December 31, 2011.