Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net revenue:
Products	$ 60,299us-gaap_SalesRevenueGoodsNet	$ 56,905us-gaap_SalesRevenueGoodsNet	$ 60,057us-gaap_SalesRevenueGoodsNet
Service	17,839us-gaap_SalesRevenueServicesNet	17,689us-gaap_SalesRevenueServicesNet	17,220us-gaap_SalesRevenueServicesNet
Total net revenue	78,138us-gaap_Revenues	74,594us-gaap_Revenues	77,277us-gaap_Revenues
Cost of revenue:
Products	26,796us-gaap_CostOfGoodsSold	24,179us-gaap_CostOfGoodsSold	26,911us-gaap_CostOfGoodsSold
Service	7,969us-gaap_CostOfServices	8,533us-gaap_CostOfServices	8,826us-gaap_CostOfServices
Total cost of revenue	34,765us-gaap_CostOfRevenue	32,712us-gaap_CostOfRevenue	35,737us-gaap_CostOfRevenue
Gross profit	43,373us-gaap_GrossProfit	41,882us-gaap_GrossProfit	41,540us-gaap_GrossProfit
Operating expenses:
Sales and marketing	32,246us-gaap_SellingAndMarketingExpense	27,984us-gaap_SellingAndMarketingExpense	28,664us-gaap_SellingAndMarketingExpense
Research and development	10,543us-gaap_ResearchAndDevelopmentExpense	9,216us-gaap_ResearchAndDevelopmentExpense	8,427us-gaap_ResearchAndDevelopmentExpense
General and administrative	11,203us-gaap_GeneralAndAdministrativeExpense	9,938us-gaap_GeneralAndAdministrativeExpense	11,276us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	53,922us-gaap_OperatingExpenses	47,138us-gaap_OperatingExpenses	48,367us-gaap_OperatingExpenses
Loss from operations	(10,619)us-gaap_OperatingIncomeLoss	(5,256)us-gaap_OperatingIncomeLoss	(6,827)us-gaap_OperatingIncomeLoss
Interest and other income, net	226us-gaap_NonoperatingIncomeExpense	455us-gaap_NonoperatingIncomeExpense	497us-gaap_NonoperatingIncomeExpense
Loss before income taxes	(10,393)	(4,801)	(6,330)
Income tax (benefit) provision	219us-gaap_IncomeTaxExpenseBenefit	(54)us-gaap_IncomeTaxExpenseBenefit	218us-gaap_IncomeTaxExpenseBenefit
Net loss	$ (10,612)us-gaap_NetIncomeLoss	$ (4,747)us-gaap_NetIncomeLoss	$ (6,548)us-gaap_NetIncomeLoss
Net loss per share:
Basic and diluted (in Dollars per share)	$ (0.74)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.33)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.46)us-gaap_EarningsPerShareBasicAndDiluted
Weighted-average number of shares used in per share calculations:
Basic and diluted (in Shares)	14,254	14,421	14,089

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