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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2009 | Apr. 01, 2009 | Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  | 5,135,000 stem_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet |
Impairment amount of intangible asset | 530,000 stem_ImpairmentsOfIntangibleAssetFiniteLived | 530,000 stem_ImpairmentsOfIntangibleAssetFiniteLived |  |  |  |  | 655,000 stem_ImpairmentsOfIntangibleAssetFiniteLived
Useful life |  | 11 years 10 months 24 days |  |  |  |  |
Proceeds from sale of indefinite intangible assets | 400,000 us-gaap_ProceedsFromSaleOfIntangibleAssets | 400,000 us-gaap_ProceedsFromSaleOfIntangibleAssets |  |  |  |  |
Percentage of purchase price allocated to goodwill |  | 42.00%stem_BusinessAcquisitionGoodwillAsPercentageOfPurchasePrice |  |  |  |  |
Impairment of Goodwill |  | 1,910,062 us-gaap_GoodwillImpairmentLoss |  |  |  |  |
Amortization expense |  | $ 299,000 us-gaap_AmortizationOfIntangibleAssets | $ 269,000 us-gaap_AmortizationOfIntangibleAssets | $ 264,000 us-gaap_AmortizationOfIntangibleAssets |  |  |
In-process research and development [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Minimum expiration year of intangible assets |  | 2027 |  |  |  |  |
Trade name [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Useful life |  | 15 years |  |  | 15 years | 15 years |

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- Definition Business Acquisition Cost Of Acquired Entity Purchase Price Net + References No definition available. + Details
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- Definition Business acquisition goodwill as percentage of purchase price. + References No definition available. + Details
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- Definition Impairments Of Intangible Asset Finite Lived + References No definition available. + Details
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- Definition Minimum Expiration Year Of Intangible Assets + References No definition available. + Details
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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 The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of loss from the write-down of an asset representing the 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + 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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