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 sales	$ 2,328us-gaap_SalesRevenueGoodsNet	$ 1,898us-gaap_SalesRevenueGoodsNet
Royalties	2,011us-gaap_RoyaltyRevenue	2,424us-gaap_RoyaltyRevenue
Total revenue	4,339us-gaap_Revenues	4,322us-gaap_Revenues
Cost of revenue:
Product sales	1,019us-gaap_CostOfGoodsSold	1,205us-gaap_CostOfGoodsSold
Total cost of revenue	1,019us-gaap_CostOfRevenue	1,205us-gaap_CostOfRevenue
Gross profit	3,320us-gaap_GrossProfit	3,117us-gaap_GrossProfit
Operating expenses:
Selling, marketing and product support	1,415us-gaap_SellingAndMarketingExpense	2,720us-gaap_SellingAndMarketingExpense
General and administrative	1,478us-gaap_GeneralAndAdministrativeExpense	1,372us-gaap_GeneralAndAdministrativeExpense
Research and development	1,077us-gaap_ResearchAndDevelopmentExpense	1,816us-gaap_ResearchAndDevelopmentExpense
Amortization of intangible assets	381us-gaap_AmortizationOfIntangibleAssets	389us-gaap_AmortizationOfIntangibleAssets
Restructuring	119us-gaap_RestructuringCharges	460us-gaap_RestructuringCharges
Investigation matter		116isns_InvestigationCosts
Total operating expenses	4,470us-gaap_OperatingExpenses	6,873us-gaap_OperatingExpenses
Loss from operations	(1,150)us-gaap_OperatingIncomeLoss	(3,756)us-gaap_OperatingIncomeLoss
Other, net	(1)us-gaap_OtherNonoperatingIncomeExpense	(1)us-gaap_OtherNonoperatingIncomeExpense
Loss before income taxes	(1,151)	(3,757)
Income tax expense	16us-gaap_IncomeTaxExpenseBenefit
Net loss	$ (1,167)us-gaap_NetIncomeLoss	$ (3,757)us-gaap_NetIncomeLoss
Net loss per share:
Basic	$ (0.23)us-gaap_EarningsPerShareBasic	$ (0.76)us-gaap_EarningsPerShareBasic
Diluted	$ (0.23)us-gaap_EarningsPerShareDiluted	$ (0.76)us-gaap_EarningsPerShareDiluted
Weighted average number of common shares outstanding:
Basic	4,999	4,976
Diluted	4,999	4,976

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