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Loan Payable - Summary of Changes in Carrying Value of Loans Payable (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Carrying value of loan payable (current and non-current) Beginning Balance	$ 13,372,796us-gaap_LoansPayable	$ 15,020,417us-gaap_LoansPayable
Repayment of principal	(1,681,664)us-gaap_DebtInstrumentAnnualPrincipalPayment
Accretion of discount	34,043stem_AccretionOfDebtDiscountNetCarryingAmount
Carrying value of loan payable (current and non-current) Ending Balance	13,372,796us-gaap_LoansPayable	15,020,417us-gaap_LoansPayable
Carrying value of loan payable, current portion	4,097,837us-gaap_LoansPayableCurrent	4,686,388us-gaap_LoansPayableCurrent
Carrying value of loan payable, non-current portion	9,274,959us-gaap_LongTermLoansPayable	10,334,029us-gaap_LongTermLoansPayable
Total loan payable	13,372,796us-gaap_LoansPayable	15,020,417us-gaap_LoansPayable
CIRM [Member]
Debt Instrument [Line Items]
Carrying value of loan payable (current and non-current) Beginning Balance	8,916,641us-gaap_LoansPayable / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember	9,595,807us-gaap_LoansPayable / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember
Repayment of principal	(679,166)us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember
Carrying value of loan payable (current and non-current) Ending Balance	8,916,641us-gaap_LoansPayable / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember	9,595,807us-gaap_LoansPayable / 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	8,916,641us-gaap_LoansPayable / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember	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	4,456,155us-gaap_LoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember	5,424,610us-gaap_LoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Repayment of principal	(1,002,498)us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Accretion of discount	34,043stem_AccretionOfDebtDiscountNetCarryingAmount / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Carrying value of loan payable (current and non-current) Ending Balance	4,456,155us-gaap_LoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember	5,424,610us-gaap_LoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Carrying value of loan payable, current portion	4,097,837us-gaap_LoansPayableCurrent / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Carrying value of loan payable, non-current portion	358,318us-gaap_LongTermLoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember
Total loan payable	$ 4,456,155us-gaap_LoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember	$ 5,424,610us-gaap_LoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember

X

- Definition

Accretion Of Debt Discount Net Carrying Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	stem_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a)(2))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

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

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X

- 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

-Subparagraph (SX 210.5-02.22)

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



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-Name Regulation S-X (SX)

-Number 210

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-Paragraph 22

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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