Capital Stock - Series B Preferred Stock Transactions - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified
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0 Months Ended |
12 Months Ended |
1 Months Ended |
3 Months Ended |
12 Months Ended |
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May 12, 2008
Investor
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Dec. 31, 2013
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Nov. 30, 2014
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Oct. 31, 2014
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May 31, 2008
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Dec. 31, 2014
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Dec. 31, 2008
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Aug. 31, 2013
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Mar. 12, 2013
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Jan. 22, 2013
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Jul. 24, 2013
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Class of Stock [Line Items] |
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Number of accredited investors |
5isco_NumberOfAccreditedInvestors |
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Conversion ratio for each share |
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5.048us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion |
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Warrants exercisable price |
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$ 0.25us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |
$ 0.20us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |
$ 0.20us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |
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Series B Warrants [Member] |
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Class of Stock [Line Items] |
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Number of warrants to purchase common stock |
2isco_NumberOfWarrantsInEachUnit / us-gaap_StatementEquityComponentsAxis = isco_SeriesBWarrantsMember |
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Common Stock [Member] |
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Class of Stock [Line Items] |
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Number of units issued |
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16,754,822isco_NumberOfUnitsIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
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Series B Preferred Stock [Member] |
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Class of Stock [Line Items] |
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Number of units issued |
400,000isco_NumberOfUnitsIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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Number of Series B Preferred Stock for each Series B unit |
1isco_NumberOfSharesInEachUnit / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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1isco_NumberOfSharesInEachUnit / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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Common stock purchase price, per share |
1.00isco_PurchasePricePerUnit / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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Proceeds from issuance of preferred stock and warrants |
400us-gaap_ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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Initial conversion price |
0.50isco_ConversionOfStockInitialConversionPrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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$ 0.0576isco_ConversionOfStockInitialConversionPrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
$ 0.06447isco_ConversionOfStockInitialConversionPrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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Warrants exercisable price |
0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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$ 0.15us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Number of years from issuance of warrants to convert as common stock |
5 years |
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Liquidation premium |
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6.00%isco_PercentageOfShareLiquidationPremium / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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Preferred stock, shares issued |
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300,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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300,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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Preferred stock, shares outstanding |
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300,000us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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300,000us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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Convertible preferred stock, conversion price |
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$ 0.0576isco_ConvertiblePreferredStockConversionPrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
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Series B Preferred Stock [Member] | Common Stock [Member] |
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Class of Stock [Line Items] |
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Conversion ratio for each share |
2us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
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