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Capital Stock - Series G Preferred Stock Transactions - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Sep. 10, 2014
Aug. 06, 2014
Jun. 26, 2014
May 29, 2014
Mar. 12, 2013
Jan. 22, 2013
Dec. 31, 2014
Dec. 31, 2013
Mar. 09, 2012
Directors
Nov. 30, 2014
Oct. 31, 2014
Class of Stock [Line Items]                      
Number of shares of common stock sold 4,444,445us-gaap_StockIssuedDuringPeriodSharesNewIssues 6,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 5,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 3,333,333us-gaap_StockIssuedDuringPeriodSharesNewIssues 5,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 10,125,000us-gaap_StockIssuedDuringPeriodSharesNewIssues          
Issuance price per share $ 0.09us-gaap_EquityIssuancePerShareAmount $ 0.10us-gaap_EquityIssuancePerShareAmount     $ 0.20us-gaap_EquityIssuancePerShareAmount $ 0.20us-gaap_EquityIssuancePerShareAmount          
Conversion ratio for each share             5.048us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion        
Legal costs             $ 169us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts $ 178us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts      
Series G Preferred Stock [Member]                      
Class of Stock [Line Items]                      
Convertible preferred stock, conversion price             $ 0.1981isco_ConvertiblePreferredStockConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
  $ 0.40isco_ConvertiblePreferredStockConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
   
Conversion ratio for each share                 2.5us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
   
Number of directors to be nominated by preferred shareholders                 2isco_NumberOfDirectorsToBeNominatedByPreferredShareholders
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
   
Number of independent directors out of directors to be nominated by preferred shareholders                 1isco_NumberOfIndependentDirectorsOutOfDirectorsToBeNominatedByPreferredShareholders
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
   
Legal costs                 59us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
   
Preferred stock, shares issued             5,000,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
0us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
     
Preferred stock, shares outstanding             5,000,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
     
Initial conversion price                   $ 0.0576isco_ConversionOfStockInitialConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
$ 0.06447isco_ConversionOfStockInitialConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
Series G Preferred Stock [Member] | Minimum [Member]                      
Class of Stock [Line Items]                      
Convertible Redeemable Preferred stock, shares outstanding                 1,000,000us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
   
Series G Preferred Stock [Member] | AR Partners, LLC [Member]                      
Class of Stock [Line Items]                      
Number of shares of common stock sold                 5,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= isco_ArPartnersLlcMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
   
Issuance price per share                 $ 1.00us-gaap_EquityIssuancePerShareAmount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= isco_ArPartnersLlcMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
   
Total proceeds                 $ 5,000us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= isco_ArPartnersLlcMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember
   
Convertible Redeemable Series G Preferred stock [Member]                      
Class of Stock [Line Items]                      
Convertible Redeemable Preferred stock, shares outstanding             0us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= isco_RedeemableConvertibleSeriesGPreferredStockMember
5,000,000us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= isco_RedeemableConvertibleSeriesGPreferredStockMember
     
Convertible Redeemable Preferred stock, shares issued             0us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= isco_RedeemableConvertibleSeriesGPreferredStockMember
5,000,000us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= isco_RedeemableConvertibleSeriesGPreferredStockMember