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Warrant Liability - Summary of Changes in Fair Value of Warrant Liability (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
Class of Warrant or Right [Line Items]
Number of Warrants, ending balance	7,336,880us-gaap_ClassOfWarrantOrRightOutstanding
Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Number of Warrants, beginning balance	6,936,880us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_StatementClassOfStockAxis = stem_SeriesWarrantMember
Number of Warrants, changes in fair value	0stem_IncreaseDecreaseInNumberOfWarrants / us-gaap_StatementClassOfStockAxis = stem_SeriesWarrantMember
Number of Warrants, ending balance	6,936,880us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_StatementClassOfStockAxis = stem_SeriesWarrantMember
Fair value of warrant liability, beginning balance	$ 1,684,551stem_FairValueOfWarrants / us-gaap_StatementClassOfStockAxis = stem_SeriesWarrantMember
Fair value, changes in fair value at period end	347,330stem_IncreaseDecreaseInFairValueOfWarrant / us-gaap_StatementClassOfStockAxis = stem_SeriesWarrantMember
Fair value of warrant liability, ending balance	$ 2,031,881stem_FairValueOfWarrants / us-gaap_StatementClassOfStockAxis = stem_SeriesWarrantMember

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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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