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

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- Definition Fair value of warrants. + References No definition available. + Details
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Namespace Prefix: | stem_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Increase Decrease In Fair Value Of Warrant + References No definition available. + Details
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Namespace Prefix: | stem_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase Decrease In Number Of Warrants + References No definition available. + Details
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Namespace Prefix: | stem_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_StatementClassOfStockAxis=stem_SeriesWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |