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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Contingency [Line Items] |  |  |
Unrecognized tax benefits | $ 0 us-gaap_UnrecognizedTaxBenefits |  | $ 0 us-gaap_UnrecognizedTaxBenefits
Increase in valuation allowances | 10,657,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 10,270,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
Tax liabilities | 0 us-gaap_DeferredIncomeTaxLiabilities |  |
Tax related interest | 0 us-gaap_IncomeTaxExaminationInterestExpense |  |
Tax related penalties | 0 us-gaap_IncomeTaxExaminationPenaltiesExpense |  |
Domestic Tax Authority [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carry forward | 158,465,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |
Operating loss carryforward expiration period description | 2018 through 2034 |  |
Excess deductions from exercise of stock option | 1,792,000 stem_AdjustmentsToAdditionalPaidInCapitalReclassificationExcerciseOfStockOption / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |
State and Local Jurisdiction [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carry forward | 40,241,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Operating loss carryforward expiration period description | 2015 through 2034 |  |
Operating loss carry forward for the exercise of stock | 1,362,000 stem_OperatingLossCarryforwardsExerciseOfStockOptions / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Foreign Tax Authority [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carry forward | 8,208,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
Capital Loss Carryforward [Member] | Domestic And State [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating loss carryforward expiration period description | 2015 through 2016 |  |
Capital loss carry forward for federal and state income tax purposes | 746,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = stem_DomesticAndStateMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_CapitalLossCarryforwardMember |  |
Research and Development [Member] | Domestic Tax Authority [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating loss carryforward expiration period description | 2018 through 2034 |  |
Capital loss carry forward for federal and state income tax purposes | 6,178,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember |  |
Research and Development [Member] | State and Local Jurisdiction [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Capital loss carry forward for federal and state income tax purposes | 5,484,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember |  |
State research and development tax credits net of federal tax effect | $ 3,619,000 stem_TaxCreditCarryForwardNet / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember |  |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition The amount of estimated interest recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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