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v2.4.1.9

Commitments and Contingencies - Future Minimum Payments Under All Leases and Loan Payable (Parenthetical) (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 14 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2014 | Apr. 30, 2013 | Aug. 31, 2014 | Feb. 28, 2015
Loss Contingencies [Line Items] |  |  |  |
Proceeds from principal and accrued interest | $ 9,200,000 stem_DebtInstrumentPrincipalAndAccruedInterestForgiven |  |  |
CIRM [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Approval of fund by California Institute for Regenerative Medicine (CIRM) |  | 19,300,000 stem_ApprovalOfFundToCollaborators / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |  |
Aggregate proceeds from disbursement of the loan |  |  | 9,600,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |
Forgiveness of loan principal | 8,917,000 us-gaap_DebtInstrumentDecreaseForgiveness / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |  |  |
Accrued interest forgiven | 243,000 us-gaap_DebtInstrumentIncreaseAccruedInterest / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |  |  |
Subsequent Events [Member] | CIRM [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Repayment of aggregate loan proceeds received |  |  |  | $ 679,000 us-gaap_RepaymentsOfDebt / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember

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- Definition Decrease for amounts of indebtedness forgiven by the holder of the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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- Definition Increase for accrued, but unpaid interest on the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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