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Fair Value Measurement - Roll Forward for Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Add loan proceeds |  |  |  |  |  |  |  |  | $ 5,775,543 us-gaap_ProceedsFromLoans |  |
Less repayments of principal | (3,857,971)us-gaap_DebtInstrumentAnnualPrincipalPayment |  |  |  |  |  |  |  | (3,857,971)us-gaap_DebtInstrumentAnnualPrincipalPayment |  |
Add change in fair value of warrants | 2,327,000 us-gaap_FairValueAdjustmentOfWarrants | 4,076,000 us-gaap_FairValueAdjustmentOfWarrants | (3,654,000)us-gaap_FairValueAdjustmentOfWarrants | (327,000)us-gaap_FairValueAdjustmentOfWarrants | 2,828,000 us-gaap_FairValueAdjustmentOfWarrants | (144,000)us-gaap_FairValueAdjustmentOfWarrants | 758,000 us-gaap_FairValueAdjustmentOfWarrants | (189,000)us-gaap_FairValueAdjustmentOfWarrants | (2,422,451)us-gaap_FairValueAdjustmentOfWarrants | (3,253,253)us-gaap_FairValueAdjustmentOfWarrants | 5,944,571 us-gaap_FairValueAdjustmentOfWarrants
Outstanding Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2013 |  |  |  | 5,541,809 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |  |  |  |  | 5,541,809 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |  |
Less fair value of warrants exercised |  |  |  |  |  |  |  |  | (1,434,807)stem_LessFairValueOfWarrantsExercised / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |  |
Add change in fair value of warrants |  |  |  |  |  |  |  |  | (2,422,451)us-gaap_FairValueAdjustmentOfWarrants / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |  |
Balance at December 31, 2014 | 1,684,551 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |  |  |  |  |  |  |  | 1,684,551 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |  |
Balance at December 31, 2014 | 1,684,551 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |  |  |  |  |  |  |  | 1,684,551 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |  |
Loan Payable [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2013 |  |  |  | 12,909,244 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |  |  |  | 12,909,244 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |
Add loan proceeds |  |  |  |  |  |  |  |  | 5,775,543 us-gaap_ProceedsFromLoans / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |
Less repayments of principal | (3,857,971)us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |  |  |  |  |  |  | (3,857,971)us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |
Add accretion of discount |  |  |  |  |  |  |  |  | 193,601 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |
Balance at December 31, 2014 | 15,020,417 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |  |  |  |  |  |  | 15,020,417 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |
Current portion | 4,686,388 stem_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValueCurrent / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |  |  |  |  |  |  | 4,686,388 stem_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValueCurrent / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |
Non-current portion | 10,334,029 stem_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValueNoncurrent / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |  |  |  |  |  |  | 10,334,029 stem_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValueNoncurrent / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |
Balance at December 31, 2014 | $ 15,020,417 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |  |  |  |  |  |  | $ 15,020,417 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoansPayableMember |  |

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Current + References No definition available. + Details
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- Definition Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Noncurrent + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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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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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + 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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