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Deferred Revenue - Additional Information (Detail) - Non Software License Arrangement [Member] - Stem Cell Therapeutics [Member] | 12 Months Ended
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Dec. 31, 2015 USD ($)
Deferred Revenue Arrangement [Line Items] |
Number of year up front license fee being amortized | 12 years
Unamortized amount of deferred revenue | $ 46,000

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DeferredRevenueArrangementLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DeferredRevenueArrangementTypeAxis=us-gaap_NonsoftwareLicenseArrangementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LeaseArrangementTypeAxis=stem_StemCellTherapeuticsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |