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Stock Options and Warrants - Restricted Stock Awards - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 1,418us-gaap_AllocatedShareBasedCompensationExpense $ 1,693us-gaap_AllocatedShareBasedCompensationExpense
Unrecognized compensation cost related to unvested shares expected to be recognized, weighted-average period 2 years 2 months 12 days 1 year 7 months 6 days
Restricted Stock [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting terms 1 year  
Under 2006 Plan and 2010 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant-date fair value of restricted stock awards 194us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= isco_RestrictedStockIssuedFromTwoThousandSixPlanAndTwoThousandTenPlansMember
273us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= isco_RestrictedStockIssuedFromTwoThousandSixPlanAndTwoThousandTenPlansMember
Stock-based compensation expense 191us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= isco_RestrictedStockIssuedFromTwoThousandSixPlanAndTwoThousandTenPlansMember
240us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= isco_RestrictedStockIssuedFromTwoThousandSixPlanAndTwoThousandTenPlansMember
Unrecognized compensation costs $ 8us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= isco_RestrictedStockIssuedFromTwoThousandSixPlanAndTwoThousandTenPlansMember
$ 16us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= isco_RestrictedStockIssuedFromTwoThousandSixPlanAndTwoThousandTenPlansMember
Unrecognized compensation cost related to unvested shares expected to be recognized, weighted-average period 7 months 6 days 6 months