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
Revenue:
Product sales	$ 12,806us-gaap_SalesRevenueGoodsNet	$ 14,692us-gaap_SalesRevenueGoodsNet	$ 12,564us-gaap_SalesRevenueGoodsNet
Royalties	10,247us-gaap_RoyaltyRevenue	11,598us-gaap_RoyaltyRevenue	12,399us-gaap_RoyaltyRevenue
Total revenue	23,053us-gaap_Revenues	26,290us-gaap_Revenues	24,963us-gaap_Revenues
Cost of revenue:
Product sales	8,041us-gaap_CostOfGoodsSold	9,889us-gaap_CostOfGoodsSold	6,706us-gaap_CostOfGoodsSold
Total cost of revenue	8,041us-gaap_CostOfRevenue	9,889us-gaap_CostOfRevenue	6,706us-gaap_CostOfRevenue
Gross profit	15,012us-gaap_GrossProfit	16,401us-gaap_GrossProfit	18,257us-gaap_GrossProfit
Operating expenses:
Selling, marketing and product support	9,543us-gaap_SellingAndMarketingExpense	11,768us-gaap_SellingAndMarketingExpense	7,289us-gaap_SellingAndMarketingExpense
General and administrative	6,185us-gaap_GeneralAndAdministrativeExpense	6,290us-gaap_GeneralAndAdministrativeExpense	5,167us-gaap_GeneralAndAdministrativeExpense
Research and development	5,734us-gaap_ResearchAndDevelopmentExpense	5,036us-gaap_ResearchAndDevelopmentExpense	4,135us-gaap_ResearchAndDevelopmentExpense
Amortization of intangible assets	1,558us-gaap_AmortizationOfIntangibleAssets	1,554us-gaap_AmortizationOfIntangibleAssets	1,622us-gaap_AmortizationOfIntangibleAssets
Impairment	1,017
Restructuring	770us-gaap_RestructuringCharges		430us-gaap_RestructuringCharges
Investigation matter	152isns_InvestigationCosts	3,723isns_InvestigationCosts
Goodwill impairment			3,175
Total operating expenses	24,959us-gaap_OperatingExpenses	28,371us-gaap_OperatingExpenses	21,818us-gaap_OperatingExpenses
Loss from operations	(9,947)us-gaap_OperatingIncomeLoss	(11,970)us-gaap_OperatingIncomeLoss	(3,561)us-gaap_OperatingIncomeLoss
Other income, net	70us-gaap_OtherNonoperatingIncomeExpense	6us-gaap_OtherNonoperatingIncomeExpense	29us-gaap_OtherNonoperatingIncomeExpense
Loss before income taxes	(9,877)	(11,964)	(3,532)
Income tax expense (benefit)	(174)us-gaap_IncomeTaxExpenseBenefit	3,937us-gaap_IncomeTaxExpenseBenefit	(180)us-gaap_IncomeTaxExpenseBenefit
Net loss	$ (9,703)us-gaap_NetIncomeLoss	$ (15,901)us-gaap_NetIncomeLoss	$ (3,352)us-gaap_NetIncomeLoss
Net loss per share:
Basic	$ (1.95)us-gaap_EarningsPerShareBasic	$ (3.21)us-gaap_EarningsPerShareBasic	$ (0.69)us-gaap_EarningsPerShareBasic
Diluted	$ (1.95)us-gaap_EarningsPerShareDiluted	$ (3.21)us-gaap_EarningsPerShareDiluted	$ (0.69)us-gaap_EarningsPerShareDiluted
Weighted average number of common shares outstanding:
Basic	4,983	4,955	4,886
Diluted	4,983	4,955	4,886

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details

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