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v2.4.1.9

Loan Payable - Additional Information (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 | Jul. 31, 2014 | Oct. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from loan | $ 5,775,543 us-gaap_ProceedsFromLoans |  |  |  |  |
Loan term | 3 years |  |  |  |  |
Annual interest rate on loan | 6.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage |  |  |  |  |
Period of loan subject to interest payments only | 6 months |  |  |  |  |
Period of loan subject to principal and interest payments | 30 months |  |  |  |  |
Final fee payment at the end of loan term | 1,000,000 stem_LoanFees |  |  |  |  |
Exercise price of warrant |  |  |  |  | $ 2.17 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 1.80 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Proceeds received under loan agreement | 9,900,000 us-gaap_PaymentsForProceedsFromLoansReceivable |  |  |  |  |
Initial carrying amount assigned to loan, net of discount | 9,512,000 stem_CarryingValueOfPurchasedLoans |  |  |  |  |
Fair value allocated to warrant | 388,000 stem_FairValueAllocatedToWarrant |  |  |  |  |
Cash discount | 100,000 us-gaap_DebtInstrumentUnamortizedDiscount |  |  |  |  |
Note issuance costs | 117,000 us-gaap_DebtIssuanceCosts |  |  |  |  |
Deferred financing costs, discount and accretion percentage | 9.00%stem_DebtInstrumentAmortizedDiscountPercentage |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of shares of common stock acquired using warrant | 1,180,015 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
CIRM [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from loan | 5,775,543 us-gaap_ProceedsFromLoans / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |  |  |  |  |
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] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of aggregate loan proceeds received |  |  |  | 679,000 us-gaap_RepaymentsOfDebt / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |  |
Silicon Valley Bank Loan Agreement Warrant [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term of warrant expiration | 10 years |  |  |  |  |
Exercise price of warrant | $ 1.7034 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = stem_SiliconValleyBankLoanAgreementWarrantMember |  |  |  |  |
Warrant expiration period | April 2023 |  |  |  |  |
Silicon Valley Bank Loan Agreement Warrant [Member] | Common Stock [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of shares of common stock acquired using warrant | 293,531 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = stem_SiliconValleyBankLoanAgreementWarrantMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Silicon Valley Bank [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from loan |  | 9,900,000 us-gaap_ProceedsFromLoans / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |  |  |  |
Cash discount |  | $ 100,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |  |  |  |

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