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Warrant Liability - Summary of Warrant Liability (Detail) (USD $) | Dec. 31, 2014 | Jul. 31, 2014 | Oct. 31, 2013
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Class of Warrant or Right [Line Items] |  |  |
Number Outstanding | 7,336,880 us-gaap_ClassOfWarrantOrRightOutstanding |  |
Exercise Price per share |  | $ 2.17 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 1.80 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Outstanding Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Fair Value | 1,684,551 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |  |
Series A Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number Outstanding | 6,936,880 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = stem_SeriesWarrantMember |  |
Exercise Price per share | 1.40 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = stem_SeriesWarrantMember |  |
Series A Warrants [Member] | Outstanding Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Fair Value | 1,684,551 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_ClassOfWarrantOrRightAxis = stem_SeriesWarrantMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |  |
November 2009 Financing [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number Outstanding | 400,000 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_SubsidiarySaleOfStockAxis = stem_NovemberTwoThousandNineFinancingMember |  |
Exercise Price per share | 15.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_SubsidiarySaleOfStockAxis = stem_NovemberTwoThousandNineFinancingMember |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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 (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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