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v2.4.1.9

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 | $ 12,909,244 us-gaap_LoansPayable |  |
Additional loan proceeds | 5,775,543 us-gaap_ProceedsFromLoans |  |
Repayment of principal | (3,857,971)us-gaap_DebtInstrumentAnnualPrincipalPayment |  |
Accretion of discount | 193,601 stem_AccretionOfDebtDiscountNetCarryingAmount |  |
Carrying value of loan payable (current and non-current) Ending Balance | 15,020,417 us-gaap_LoansPayable |  |
Carrying value of loan payable, current portion | 4,686,388 us-gaap_LoansPayableCurrent |  | 3,664,370 us-gaap_LoansPayableCurrent
Carrying value of loan payable, non-current portion | 10,334,029 us-gaap_LongTermLoansPayable |  | 9,244,874 us-gaap_LongTermLoansPayable
Total loan payable | 15,020,417 us-gaap_LoansPayable |  |
CIRM [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of loan payable (current and non-current) Beginning Balance | 3,820,264 us-gaap_LoansPayable / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |  |
Additional loan proceeds | 5,775,543 us-gaap_ProceedsFromLoans / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |  |
Repayment of principal |  |  |
Accretion of discount |  |  |
Carrying value of loan payable (current and non-current) Ending Balance | 9,595,807 us-gaap_LoansPayable / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |  |
Carrying value of loan payable, current portion | 679,166 us-gaap_LoansPayableCurrent / 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 | 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 | 9,088,980 us-gaap_LoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |  |
Additional loan proceeds |  | 9,900,000 us-gaap_ProceedsFromLoans / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
Repayment of principal | (3,857,971)us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |  |
Accretion of discount | 193,601 stem_AccretionOfDebtDiscountNetCarryingAmount / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |  |
Carrying value of loan payable (current and non-current) Ending Balance | 5,424,610 us-gaap_LoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |  |
Carrying value of loan payable, current portion | 4,007,222 us-gaap_LoansPayableCurrent / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |  |
Carrying value of loan payable, non-current portion | 1,417,388 us-gaap_LongTermLoansPayable / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |  |
Total loan payable | $ 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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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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- 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 + Details
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- Details
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- Details
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