Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
Dec. 31, 2014	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Proceeds from sale of indefinite intangible assets	$ 400,000	$ 400,000
Proceeds from sale of tangible assets		75,000stem_ProceedsFromSaleOfTangibleAssets
Net loss on disposal of assets	$ (111,000)	$ (111,254)

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration