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Fair Value Measurement (Details 2) (Warrant liabilities [Member], USD $) | 3 Months Ended
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Mar. 31, 2013
Warrant liabilities [Member] |
Roll forward for liabilities measured at fair value using significant unobservable inputs (Level 3) |
Balance at December 31, 2012 | $ 9,157,397
Less fair value of warrants exercised | (418,841)
Add change in fair value of warrants | 213,503
Balance at March 31, 2013 | $ 8,952,059

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- Definition Add change in fair value of warrants. + 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 Less fair value of warrants exercised. + References No definition available. + Details
Name: | stem_LessFairValueOfWarrantsExercised
Namespace Prefix: | stem_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + 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=7578670&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant