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Consolidated Statements of Operations (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue:      
Revenue from licensing agreements, grants and other $ 1,012,391stem_RevenueFromLicensingAgreementsAndGrants $ 172,297stem_RevenueFromLicensingAgreementsAndGrants $ 489,717stem_RevenueFromLicensingAgreementsAndGrants
Operating expenses:      
Research and development 21,503,085us-gaap_ResearchAndDevelopmentExpense 19,368,888us-gaap_ResearchAndDevelopmentExpense 14,682,156us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 10,419,620us-gaap_SellingGeneralAndAdministrativeExpense 8,834,271us-gaap_SellingGeneralAndAdministrativeExpense 7,359,640us-gaap_SellingGeneralAndAdministrativeExpense
Wind-down expenses   61,837stem_WindDownExpenses 356,379stem_WindDownExpenses
Total operating expenses 31,922,705us-gaap_OperatingExpenses 28,264,996us-gaap_OperatingExpenses 22,398,175us-gaap_OperatingExpenses
Operating loss (30,910,314)us-gaap_OperatingIncomeLoss (28,092,699)us-gaap_OperatingIncomeLoss (21,908,458)us-gaap_OperatingIncomeLoss
Other income (expense):      
Change in fair value of warrant liability 2,422,451us-gaap_FairValueAdjustmentOfWarrants 3,253,253us-gaap_FairValueAdjustmentOfWarrants (5,944,571)us-gaap_FairValueAdjustmentOfWarrants
Impairment of goodwill (1,910,062)us-gaap_GoodwillImpairmentLoss    
Impairment of other intangible assets (530,100)us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill    
Interest income 8,532us-gaap_InvestmentIncomeInterest 11,318us-gaap_InvestmentIncomeInterest 15,594us-gaap_InvestmentIncomeInterest
Interest expense (1,295,404)us-gaap_InterestExpense (1,166,782)us-gaap_InterestExpense (50,193)us-gaap_InterestExpense
Other income (expense), net (45,766)us-gaap_OtherNonoperatingIncomeExpense 8,218us-gaap_OtherNonoperatingIncomeExpense (83,631)us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense), net (1,350,349)us-gaap_NonoperatingIncomeExpense 2,106,007us-gaap_NonoperatingIncomeExpense (6,062,801)us-gaap_NonoperatingIncomeExpense
Net loss from continuing operations (32,260,663)us-gaap_IncomeLossFromContinuingOperations (25,986,692)us-gaap_IncomeLossFromContinuingOperations (27,971,259)us-gaap_IncomeLossFromContinuingOperations
Discontinued operations:      
Loss from discontinued operations (369,357)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (452,467)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (519,894)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net loss on disposal of assets (111,254)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax    
Net loss from discontinued operations (480,611)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (452,467)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (519,894)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net loss $ (32,741,274)us-gaap_NetIncomeLoss $ (26,439,159)us-gaap_NetIncomeLoss $ (28,491,153)us-gaap_NetIncomeLoss
Basic and diluted net loss per share:      
Basic and diluted net loss per share from continuing operations $ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare $ (0.60)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare $ (0.97)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Basic and diluted net loss per share from discontinued operations $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Basic and diluted net loss per share $ (0.53)us-gaap_EarningsPerShareBasicAndDiluted $ (0.61)us-gaap_EarningsPerShareBasicAndDiluted $ (0.99)us-gaap_EarningsPerShareBasicAndDiluted
Shares used to compute basic and diluted loss per share 61,612,957us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 43,422,001us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 28,824,417us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted