Stock Options and Warrants - Restricted Stock Awards - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
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Dec. 31, 2014
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Dec. 31, 2013
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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 |
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. No definition available.
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- Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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