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Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | $ 4,203,612 us-gaap_FiniteLivedIntangibleAssetsGross | $ 4,203,612 us-gaap_FiniteLivedIntangibleAssetsGross |
Accumulated Amortization | (2,357,596)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (2,357,596)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Proceeds from sale | (400,000)us-gaap_ProceedsFromSaleOfIntangibleAssets | (400,000)us-gaap_ProceedsFromSaleOfIntangibleAssets |
Foreign Currency Translation |  | 282,786 stem_FiniteLivedIntangibleAssetsForeignCurrencyTranslation |
Write Off/Impairment | (1,371,913)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (1,371,913)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Net Carrying Amount | 356,889 us-gaap_IntangibleAssetsNetExcludingGoodwill | 356,889 us-gaap_IntangibleAssetsNetExcludingGoodwill | 1,835,717 us-gaap_IntangibleAssetsNetExcludingGoodwill
Weighted-Average Amortization Period |  | 11 years 10 months 24 days |
Related to SC Proven product line [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 1,620,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = stem_ScProvenProductLineMember | 1,620,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = stem_ScProvenProductLineMember |
Accumulated Amortization | (1,200,186)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = stem_ScProvenProductLineMember | (1,200,186)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = stem_ScProvenProductLineMember |
Proceeds from sale |  | (400,000)us-gaap_ProceedsFromSaleOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = stem_ScProvenProductLineMember |
Foreign Currency Translation |  | 167,038 stem_FiniteLivedIntangibleAssetsForeignCurrencyTranslation / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = stem_ScProvenProductLineMember |
Write Off/Impairment | (186,852)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = stem_ScProvenProductLineMember | (186,852)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = stem_ScProvenProductLineMember |
Weighted-Average Amortization Period |  | 8 years |
In-process research and development [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 1,340,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 1,340,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
Accumulated Amortization | (270,687)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | (270,687)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
Foreign Currency Translation |  | 115,748 stem_FiniteLivedIntangibleAssetsForeignCurrencyTranslation / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
Write Off/Impairment | (1,185,061)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | (1,185,061)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
Patents [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 1,243,612 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 1,243,612 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Accumulated Amortization | (886,723)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | (886,723)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Net Carrying Amount | $ 356,889 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | $ 356,889 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Weighted-Average Amortization Period |  | 17 years |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition The cash inflow from disposal of asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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