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Warrant Liability - Summary of Changes in Fair Value of Warrant Liability (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014
Class of Warrant or Right [Line Items]
Number of Warrants, ending balance	9,551,378
Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Number of Warrants, beginning balance	8,116,895
Number of Warrants, ending balance	8,116,895
Fair value of warrant liability, beginning balance	$ 5,541,809
Fair value, changes in fair value at period end	326,624
Fair value of warrant liability, ending balance	$ 5,868,433

X

- 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

X

- Definition

Increase Decrease In Fair Value Of Warrant

+ References

No definition available.

+ Details

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

X

- Details

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

X

- 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

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant