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Loan Payable - Summary of Changes in Carrying Value of Loan Payable (Detail) (USD $)	12 Months Ended	1 Months Ended
	Dec. 31, 2014	Apr. 30, 2013	Dec. 31, 2013
Debt Instrument [Line Items]
Carrying value of loan payable (current and non-current) Beginning Balance	$ 12,909,244us-gaap_LoansPayable
Additional loan proceeds	5,775,543us-gaap_ProceedsFromLoans
Repayment of principal	(3,857,971)us-gaap_DebtInstrumentAnnualPrincipalPayment
Accretion of discount	193,601stem_AccretionOfDebtDiscountNetCarryingAmount
Carrying value of loan payable (current and non-current) Ending Balance	15,020,417us-gaap_LoansPayable
Carrying value of loan payable, current portion	4,686,388us-gaap_LoansPayableCurrent		3,664,370us-gaap_LoansPayableCurrent
Carrying value of loan payable, non-current portion	10,334,029us-gaap_LongTermLoansPayable		9,244,874us-gaap_LongTermLoansPayable
Total loan payable	15,020,417us-gaap_LoansPayable
CIRM [Member]
Debt Instrument [Line Items]
Carrying value of loan payable (current and non-current) Beginning Balance	3,820,264us-gaap_LoansPayable / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember
Additional loan proceeds	5,775,543us-gaap_ProceedsFromLoans / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember
Repayment of principal
Accretion of discount
Carrying value of loan payable (current and non-current) Ending Balance	9,595,807us-gaap_LoansPayable / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember
Carrying value of loan payable, current portion	679,166us-gaap_LoansPayableCurrent / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember
Carrying value of loan payable, non-current portion	8,916,641us-gaap_LongTermLoansPayable / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember
Total loan payable	9,595,807us-gaap_LoansPayable / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember
Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Carrying value of loan payable (current and non-current) Beginning Balance	9,088,980us-gaap_LoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Additional loan proceeds		9,900,000us-gaap_ProceedsFromLoans / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Repayment of principal	(3,857,971)us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Accretion of discount	193,601stem_AccretionOfDebtDiscountNetCarryingAmount / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Carrying value of loan payable (current and non-current) Ending Balance	5,424,610us-gaap_LoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Carrying value of loan payable, current portion	4,007,222us-gaap_LoansPayableCurrent / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Carrying value of loan payable, non-current portion	1,417,388us-gaap_LongTermLoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Total loan payable	$ 5,424,610us-gaap_LoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember

X

- Definition

Accretion Of Debt Discount Net Carrying Amount

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount of the total principal payments made during the annual reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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X

- Definition

Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

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Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying value as of the balance sheet date of portion of long-term loans payable due within one year or the operating cycle if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

Carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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- Definition

Cash received from principal payments made on loans related to operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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