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