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Condensed Consolidated Statements of Operations (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue:    
Products $ 6,871,000us-gaap_SalesRevenueGoodsNet $ 5,790,000us-gaap_SalesRevenueGoodsNet
Services 4,249,000us-gaap_SalesRevenueServicesNet 3,946,000us-gaap_SalesRevenueServicesNet
Revenue, Net, Total 11,120,000us-gaap_SalesRevenueNet 9,736,000us-gaap_SalesRevenueNet
Cost of revenue:    
Cost of products 5,223,000us-gaap_CostOfGoodsSold 3,302,000us-gaap_CostOfGoodsSold
Cost of services 1,949,000us-gaap_CostOfServices 1,450,000us-gaap_CostOfServices
Cost of Goods and Services Sold, Total 7,172,000us-gaap_CostOfGoodsAndServicesSold 4,752,000us-gaap_CostOfGoodsAndServicesSold
Gross profit 3,948,000us-gaap_GrossProfit 4,984,000us-gaap_GrossProfit
Operating expenses:    
Selling, general and administrative expenses 6,769,000us-gaap_SellingGeneralAndAdministrativeExpense 6,820,000us-gaap_SellingGeneralAndAdministrativeExpense
Research and development expenses 1,229,000us-gaap_ResearchAndDevelopmentExpense 1,150,000us-gaap_ResearchAndDevelopmentExpense
Operating Expenses, Total 7,998,000us-gaap_OperatingExpenses 7,970,000us-gaap_OperatingExpenses
Loss from operations (4,050,000)us-gaap_OperatingIncomeLoss (2,986,000)us-gaap_OperatingIncomeLoss
Interest income, net of interest expense 87,000us-gaap_InvestmentIncomeInterest 152,000us-gaap_InvestmentIncomeInterest
Other income, net 18,000us-gaap_NonoperatingIncomeExpense 3,000us-gaap_NonoperatingIncomeExpense
Net loss $ (3,945,000)us-gaap_NetIncomeLoss $ (2,831,000)us-gaap_NetIncomeLoss
Net loss per share - basic and diluted (in dollars per share) $ (0.32)us-gaap_EarningsPerShareBasicAndDiluted $ (0.24)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average common shares outstanding - basic and diluted (in shares) 12,218,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 12,020,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted