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v2.4.1.9

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

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- Definition Accretion Of Debt Discount Net Carrying Amount + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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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- Details
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- 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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- 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 + Details
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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 -Subparagraph (SX 210.5-02.22) -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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