FINANCIAL INFORMATION Revised Consolidated Statements of Operations (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net revenues:
Products	$ 94,570	$ 98,718
Services	40,412	37,353
Total net revenues	134,982	136,071
Cost of revenues:
Products	34,994	37,015
Services	15,671	15,276
Amortization of intangible assets	50	651
Total cost of revenues	50,715	52,942
Gross profit	84,267	83,129
Operating expenses:
Research and development	22,954	23,607
Marketing and selling	32,815	33,909
General and administrative	18,331	15,597
Amortization of intangible assets	480	663
Restructuring (recoveries) costs, net	0	273
Loss on sale of assets	0	(125)
Total operating expenses	74,580	74,049
Operating loss	9,687	9,080
Interest income	20	73
Interest expense	(373)	(335)
Other income (expense), net	2	4
Loss before income taxes	9,336	8,822
Provision for income taxes, net	440	557
Net loss	$ 8,896	$ 8,265
Net loss per common share - basic and diluted (in dollars per share)	$ 0.23	$ 0.21
Weighted-average common shares outstanding - basic	39,099	38,977
Weighted-average common shares outstanding - diluted	39,122	39,034