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Condensed Consolidated Statements of Operations (unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue:    
Product revenue $ 28,331us-gaap_SalesRevenueGoodsNet $ 31,544us-gaap_SalesRevenueGoodsNet
Service revenue 10,442us-gaap_SalesRevenueServicesNet 10,774us-gaap_SalesRevenueServicesNet
Total revenue 38,773us-gaap_SalesRevenueNet 42,318us-gaap_SalesRevenueNet
Cost of Revenue:    
Cost of product 17,764us-gaap_CostOfGoodsSold 20,901us-gaap_CostOfGoodsSold
Cost of services 7,133us-gaap_CostOfServices 8,166us-gaap_CostOfServices
Total cost of revenue 24,897us-gaap_CostOfGoodsAndServicesSold 29,067us-gaap_CostOfGoodsAndServicesSold
Gross profit 13,876us-gaap_GrossProfit 13,251us-gaap_GrossProfit
Operating expenses:    
Product development and engineering 5,125us-gaap_ResearchAndDevelopmentExpense 5,578us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 9,562us-gaap_SellingGeneralAndAdministrativeExpense 11,522us-gaap_SellingGeneralAndAdministrativeExpense
Total operating expenses 14,687us-gaap_OperatingExpenses 17,100us-gaap_OperatingExpenses
Operating loss (811)us-gaap_OperatingIncomeLoss (3,849)us-gaap_OperatingIncomeLoss
Interest expense (49)us-gaap_InterestExpense (150)us-gaap_InterestExpense
Other expense, net (20)us-gaap_OtherNonoperatingIncomeExpense 33us-gaap_OtherNonoperatingIncomeExpense
Loss before provision for income taxes (880)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (3,966)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 188us-gaap_IncomeTaxExpenseBenefit 251us-gaap_IncomeTaxExpenseBenefit
Net Loss $ (1,068)us-gaap_NetIncomeLoss $ (4,217)us-gaap_NetIncomeLoss
Net loss per share — basic (in usd per share) $ (0.15)us-gaap_EarningsPerShareBasic $ (0.58)us-gaap_EarningsPerShareBasic
Net loss per share — diluted (in usd per share) $ (0.15)us-gaap_EarningsPerShareDiluted $ (0.58)us-gaap_EarningsPerShareDiluted
Weighted average number of shares:    
Basic (in shares) 7,131us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,283us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 7,131us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,283us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding