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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net loss $ (32,741,274)us-gaap_NetIncomeLoss $ (26,439,159)us-gaap_NetIncomeLoss $ (28,491,153)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 1,307,203us-gaap_DepreciationDepletionAndAmortization 1,058,725us-gaap_DepreciationDepletionAndAmortization 991,721us-gaap_DepreciationDepletionAndAmortization
Amortization of debt discount and issuance costs 240,021stem_AmortizationOfDebtDiscountAndDebtIssuanceCosts 288,951stem_AmortizationOfDebtDiscountAndDebtIssuanceCosts  
Stock-based compensation for employees and external services 2,034,898us-gaap_ShareBasedCompensation 2,608,670us-gaap_ShareBasedCompensation 2,878,134us-gaap_ShareBasedCompensation
Loss (gain) on disposal of fixed assets (75,917)us-gaap_GainLossOnDispositionOfAssets (38,854)us-gaap_GainLossOnDispositionOfAssets 20,883us-gaap_GainLossOnDispositionOfAssets
Write-down of fixed assets     27,500us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Impairment of intangible asset 530,100us-gaap_GoodwillAndIntangibleAssetImpairment    
Impairment of Goodwill 1,910,062us-gaap_GoodwillImpairmentLoss    
Loss on disposal of intangible assets relating to discontinued operations 186,846us-gaap_GainLossOnDispositionOfIntangibleAssets    
Value of property gifted 5,671us-gaap_NoncashContributionExpense    
Change in fair value of warrant liability (2,422,451)us-gaap_FairValueAdjustmentOfWarrants (3,253,253)us-gaap_FairValueAdjustmentOfWarrants 5,944,571us-gaap_FairValueAdjustmentOfWarrants
Changes in operating assets and liabilities:      
Other receivables 192,795us-gaap_IncreaseDecreaseInOtherReceivables (298,734)us-gaap_IncreaseDecreaseInOtherReceivables 39,825us-gaap_IncreaseDecreaseInOtherReceivables
Trade receivables (55,457)us-gaap_IncreaseDecreaseInAccountsReceivable 3,606us-gaap_IncreaseDecreaseInAccountsReceivable (50,451)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid and other current assets (465,478)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 801,611us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 22,232us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets 17,207us-gaap_IncreaseDecreaseInOtherOperatingAssets 493,584us-gaap_IncreaseDecreaseInOtherOperatingAssets 89,790us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and accrued expenses 2,055,437us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 2,143,917us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (409,333)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accrued wind-down expenses   (1,102,762)stem_IncreaseDecreaseInAccruedWindDownExpenses (1,032,024)stem_IncreaseDecreaseInAccruedWindDownExpenses
Deferred revenue (66,925)us-gaap_IncreaseDecreaseInDeferredRevenue (24,270)us-gaap_IncreaseDecreaseInDeferredRevenue 13,389us-gaap_IncreaseDecreaseInDeferredRevenue
Deferred rent (5,169)stem_IncreaseDecreaseInDeferredRent 435,967stem_IncreaseDecreaseInDeferredRent 85,572stem_IncreaseDecreaseInDeferredRent
Net cash used in operating activities (27,352,431)us-gaap_NetCashProvidedByUsedInOperatingActivities (23,322,001)us-gaap_NetCashProvidedByUsedInOperatingActivities (19,869,344)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Purchases of marketable debt securities   (687,798)us-gaap_PaymentsToAcquireMarketableSecurities (16,380,748)us-gaap_PaymentsToAcquireMarketableSecurities
Sales or maturities of marketable debt securities   14,430,000stem_ProceedsFromSaleAndMaturityOfMarketableDebtSecurities 5,762,000stem_ProceedsFromSaleAndMaturityOfMarketableDebtSecurities
Purchases of property, plant and equipment (903,943)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,680,796)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (73,083)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property, plant and equipment 3,500us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 38,500us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment  
Proceeds from the disposal of assets relating to discontinued operations 474,821us-gaap_ProceedsFromDivestitureOfBusinesses    
Acquisition of other assets   (64,000)us-gaap_PaymentsToAcquireOtherProductiveAssets  
Net cash provided by (used in) investing activities (425,622)us-gaap_NetCashProvidedByUsedInInvestingActivities 9,035,906us-gaap_NetCashProvidedByUsedInInvestingActivities (10,691,831)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Proceeds from issuance of common stock, net 18,949,647us-gaap_ProceedsFromIssuanceOfCommonStock 23,491,597us-gaap_ProceedsFromIssuanceOfCommonStock 19,747,550us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from the exercise of warrants 1,974,931us-gaap_ProceedsFromWarrantExercises 530,097us-gaap_ProceedsFromWarrantExercises 6,256,438us-gaap_ProceedsFromWarrantExercises
Proceeds from the exercise of stock options   3,452us-gaap_ProceedsFromStockOptionsExercised 3,629us-gaap_ProceedsFromStockOptionsExercised
Proceeds from loan payable, net of issuance costs 5,775,543us-gaap_ProceedsFromNotesPayable 13,558,358us-gaap_ProceedsFromNotesPayable  
Payments related to net share issuance of stock based awards (499,333)us-gaap_PaymentsOfStockIssuanceCosts (342,366)us-gaap_PaymentsOfStockIssuanceCosts (59,090)us-gaap_PaymentsOfStockIssuanceCosts
Repayments of capital lease obligations (21,316)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (12,396)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (20,167)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Repayments of debt obligations (3,982,971)stem_RepaymentOfDebtObligations (826,465)stem_RepaymentOfDebtObligations (191,250)stem_RepaymentOfDebtObligations
Net cash provided by financing activities 22,196,501us-gaap_NetCashProvidedByUsedInFinancingActivities 36,402,277us-gaap_NetCashProvidedByUsedInFinancingActivities 25,737,110us-gaap_NetCashProvidedByUsedInFinancingActivities
Increase (decrease) in cash and cash equivalents (5,581,552)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 22,116,182us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (4,824,065)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 30,585,424us-gaap_CashAndCashEquivalentsAtCarryingValue 8,471,275us-gaap_CashAndCashEquivalentsAtCarryingValue 13,311,261us-gaap_CashAndCashEquivalentsAtCarryingValue
Effects of foreign currency rate changes on cash (16,269)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (2,033)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (15,921)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Cash and cash equivalents at end of the year 24,987,603us-gaap_CashAndCashEquivalentsAtCarryingValue 30,585,424us-gaap_CashAndCashEquivalentsAtCarryingValue 8,471,275us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:      
Interest paid 479,011us-gaap_InterestPaid 427,040us-gaap_InterestPaid 50,193us-gaap_InterestPaid
Supplemental schedule of non-cash investing and financing activities:      
Equipment acquired under a capital lease   43,600us-gaap_CapitalLeaseObligationsIncurred 21,721us-gaap_CapitalLeaseObligationsIncurred
Equity Financing Agreement [Member]      
Supplemental schedule of non-cash investing and financing activities:      
Fair value of shares issued as consideration   600,006us-gaap_StockIssued1
/ us-gaap_RelatedPartyTransactionAxis
= stem_FinancingAgreementMember		  
Acquired Patent Portfolio [Member]      
Supplemental schedule of non-cash investing and financing activities:      
Fair value of shares issued as consideration   $ 200,000us-gaap_StockIssued1
/ us-gaap_RelatedPartyTransactionAxis
= stem_PatentMember