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Fair Value Measurement (Details 2) (Warrant liabilities [Member], USD $)	3 Months Ended
	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

X

- Definition

Add change in fair value of warrants.

+ References

No definition available.

+ Details

Name:	stem_AddChangeInFairValueOfWarrants
Namespace Prefix:	stem_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

X

- Details

Name:	us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant