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Commitments and Contingencies - Future Minimum Payments Under All Leases and Loan Payable (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Loss Contingencies [Line Items] |  |
Less current maturities, bond payable and loan payable |  | $ 125,000 us-gaap_LongTermDebtCurrent
Less current maturities, Capital Leases | 20,191 us-gaap_CapitalLeaseObligationsCurrent | 21,316 us-gaap_CapitalLeaseObligationsCurrent
CIRM [Member] |  |
Loss Contingencies [Line Items] |  |
2015 | 679,166 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |
2017 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |
2018 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |
2019 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |
Thereafter | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |
Total minimum loan payments | 679,166 us-gaap_LongTermDebt / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |
Less amounts representing interest | 0 stem_BondsPayableInterestExpenseLongTermDebt / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |
Principal amounts of bond payable and loan payable | 679,166 stem_LongTermDebtPresentValueOfNetMinimumRepayments / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |
Principal amounts of bond payable and loan payable | 679,166 stem_LongTermDebtPresentValueOfNetMinimumRepayments / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |
Less current maturities, bond payable and loan payable | 679,166 us-gaap_LongTermDebtCurrent / us-gaap_TypeOfArrangementAxis = stem_CaliforniaInstituteForRegenerativeMedicineMember |
Silicon Valley Bank [Member] |  |
Loss Contingencies [Line Items] |  |
2015 | 4,322,035 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
2016 | 1,440,678 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
2017 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
2018 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
2019 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
Thereafter | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
Total minimum loan payments | 5,762,713 us-gaap_LongTermDebt / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
Less amounts representing interest | 240,899 stem_InterestExpenseOnLongTermDebt / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
Principal amounts of bond payable and loan payable | 5,521,814 stem_LongTermDebtPresentValueOfNetMinimumRepayments / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
Principal amounts of bond payable and loan payable | 5,521,814 stem_LongTermDebtPresentValueOfNetMinimumRepayments / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
Less current maturities, bond payable and loan payable | 4,099,319 us-gaap_LongTermDebtCurrent / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
Bond payable and loan payable, less current maturities | 1,422,495 us-gaap_LongTermDebtNoncurrent / us-gaap_RelatedPartyTransactionAxis = stem_SiliconValleyBankMember |
Operating Leases [Member] |  |
Loss Contingencies [Line Items] |  |
Operating Leases, 2015 | 1,981,461 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_OperatingLeasesMember |
Operating Leases, 2016 | 1,968,459 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_OperatingLeasesMember |
Operating Leases, 2017 | 2,014,706 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_OperatingLeasesMember |
Operating Leases, 2018 | 2,061,260 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_OperatingLeasesMember |
Operating Leases, 2019 | 2,108,130 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_OperatingLeasesMember |
Operating Leases, Thereafter | 6,088,780 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_OperatingLeasesMember |
Total minimum lease payments, Operating Leases | 16,222,796 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_OperatingLeasesMember |
Capital Leases [Member] |  |
Loss Contingencies [Line Items] |  |
Capital Leases, 2015 | 21,591 us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |
Capital Leases, 2016 | 9,454 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |
Capital Leases, 2017 | 0 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |
Capital Leases, 2018 | 0 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |
Capital Leases, 2019 | 0 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |
Capital Leases, Thereafter | 0 us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |
Total minimum lease payments, Capital Leases | 31,045 us-gaap_CapitalLeasesFutureMinimumPaymentsNetMinimumPayments1 / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |
Less amounts representing interest, Capital Leases | 1,624 us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |
Principal amounts of bond payable, loan payable and capital lease obligations, Capital Leases | 29,421 us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |
Principal amounts of bond payable, loan payable and capital lease obligations, Capital Leases | 29,421 us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |
Less current maturities, Capital Leases | 20,191 us-gaap_CapitalLeaseObligationsCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |
Capital Leases, Less current maturities | $ 9,230 stem_CapitalLeasesFutureMinimumPaymentsWithLessCurrentMaturities / us-gaap_LossContingenciesByNatureOfContingencyAxis = stem_CapitalLeaseMember |

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- Definition Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -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 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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