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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 14,145,901us-gaap_CashAndCashEquivalentsAtCarryingValue $ 24,987,603us-gaap_CashAndCashEquivalentsAtCarryingValue
Trade receivables 17,169us-gaap_AccountsReceivableNetCurrent 159,466us-gaap_AccountsReceivableNetCurrent
Other receivables 166,767us-gaap_OtherReceivables 256,166us-gaap_OtherReceivables
Prepaid assets 970,573us-gaap_PrepaidExpenseCurrent 1,017,726us-gaap_PrepaidExpenseCurrent
Deferred financing costs, current 15,144us-gaap_DeferredFinanceCostsCurrentNet 22,082us-gaap_DeferredFinanceCostsCurrentNet
Other assets, current 63,763us-gaap_OtherAssetsCurrent 64,928us-gaap_OtherAssetsCurrent
Total current assets 15,379,317us-gaap_AssetsCurrent 26,507,971us-gaap_AssetsCurrent
Property, plant and equipment, net 5,159,997us-gaap_PropertyPlantAndEquipmentNet 5,186,958us-gaap_PropertyPlantAndEquipmentNet
Deferred financing costs, non-current   1,224us-gaap_DeferredFinanceCostsNoncurrentNet
Other assets, non-current 373,717us-gaap_OtherAssetsNoncurrent 373,717us-gaap_OtherAssetsNoncurrent
Intangible assets, net 336,027us-gaap_IntangibleAssetsNetExcludingGoodwill 356,889us-gaap_IntangibleAssetsNetExcludingGoodwill
Total assets 21,249,058us-gaap_Assets 32,426,759us-gaap_Assets
Current liabilities:    
Accounts payable 1,677,534us-gaap_AccountsPayableCurrent 1,818,831us-gaap_AccountsPayableCurrent
Accrued expenses and other current liabilities 3,301,153us-gaap_AccruedLiabilitiesCurrent 4,869,710us-gaap_AccruedLiabilitiesCurrent
Deferred revenue, current 16,826us-gaap_DeferredRevenueCurrent 16,826us-gaap_DeferredRevenueCurrent
Capital lease obligation, current 18,527us-gaap_CapitalLeaseObligationsCurrent 20,191us-gaap_CapitalLeaseObligationsCurrent
Deferred rent, current 98,791us-gaap_DeferredRentCreditCurrent 85,925us-gaap_DeferredRentCreditCurrent
Loan payable net of discount, current 4,097,837us-gaap_LoansPayableCurrent 4,686,388us-gaap_LoansPayableCurrent
Total current liabilities 9,210,668us-gaap_LiabilitiesCurrent 11,497,871us-gaap_LiabilitiesCurrent
Capital lease obligations, non-current 5,322us-gaap_CapitalLeaseObligationsNoncurrent 9,230us-gaap_CapitalLeaseObligationsNoncurrent
Loan payable net of discount, non-current 9,274,959us-gaap_LongTermLoansPayable 10,334,029us-gaap_LongTermLoansPayable
Fair value of warrant liability 2,031,881stem_FairValueOfWarrantLiability 1,684,551stem_FairValueOfWarrantLiability
Other long-term liabilities 1,319,829stem_DepositsAndOtherLongTermLiabilities 1,250,007stem_DepositsAndOtherLongTermLiabilities
Deferred rent, non-current 1,710,679us-gaap_DeferredRentCreditNoncurrent 1,734,214us-gaap_DeferredRentCreditNoncurrent
Deferred revenue, non-current 41,878us-gaap_DeferredRevenueNoncurrent 46,084us-gaap_DeferredRevenueNoncurrent
Total liabilities 23,595,216us-gaap_Liabilities 26,555,986us-gaap_Liabilities
Commitments and contingencies (Note 7)      
Stockholders' equity:    
Common stock, $0.01 par value; 225,000,000 shares authorized; issued and outstanding 69,311,545 at March 31, 2015 and 68,729,774 at December 31, 2014 693,116us-gaap_CommonStockValue 687,298us-gaap_CommonStockValue
Additional paid-in capital 426,550,087us-gaap_AdditionalPaidInCapitalCommonStock 425,389,693us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (429,622,309)us-gaap_RetainedEarningsAccumulatedDeficit (420,271,608)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income 32,948us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 65,390us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity (2,346,158)us-gaap_StockholdersEquity 5,870,773us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 21,249,058us-gaap_LiabilitiesAndStockholdersEquity $ 32,426,759us-gaap_LiabilitiesAndStockholdersEquity