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Deferred Revenue - Additional Information (Detail) (Nonsoftware License Arrangement [Member], Stem Cell Therapeutics [Member], USD $) | 12 Months Ended
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Dec. 31, 2014
Nonsoftware License Arrangement [Member] | Stem Cell Therapeutics [Member] |
Deferred Revenue Arrangement [Line Items] |
Number of year up front license fee being amortized | 12 years
Unamortized amount of deferred revenue | $ 63,000 stem_DeferredRevenueUnamortizedAmount / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareLicenseArrangementMember / us-gaap_LeaseArrangementTypeAxis = stem_StemCellTherapeuticsMember

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- Definition Deferred revenue unamortized amount. + References No definition available. + Details
Name: | stem_DeferredRevenueUnamortizedAmount
Namespace Prefix: | stem_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deferred revenue upfront license fee amortization period. + References No definition available. + Details
Name: | stem_DeferredRevenueUpfrontLicenseFeeAmortizationPeriod
Namespace Prefix: | stem_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DeferredRevenueArrangementLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration