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

X

- 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

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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

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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

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