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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 24,987,603us-gaap_CashAndCashEquivalentsAtCarryingValue $ 30,585,424us-gaap_CashAndCashEquivalentsAtCarryingValue
Trade receivables 159,466us-gaap_AccountsReceivableNetCurrent 108,815us-gaap_AccountsReceivableNetCurrent
Other receivables 256,166us-gaap_OtherReceivables 486,222us-gaap_OtherReceivables
Prepaid assets 1,017,726us-gaap_PrepaidExpenseCurrent 530,037us-gaap_PrepaidExpenseCurrent
Deferred financing costs, current 22,082us-gaap_DeferredFinanceCostsCurrentNet 46,420us-gaap_DeferredFinanceCostsCurrentNet
Other current assets 64,928us-gaap_OtherAssetsCurrent 83,537us-gaap_OtherAssetsCurrent
Total current assets 26,507,971us-gaap_AssetsCurrent 31,840,455us-gaap_AssetsCurrent
Property, plant and equipment, net 5,186,958us-gaap_PropertyPlantAndEquipmentNet 5,304,684us-gaap_PropertyPlantAndEquipmentNet
Other assets, non-current 373,717us-gaap_OtherAssetsNoncurrent 413,717us-gaap_OtherAssetsNoncurrent
Goodwill   2,139,294us-gaap_Goodwill
Other intangible assets, net 356,889us-gaap_IntangibleAssetsNetExcludingGoodwill 1,835,717us-gaap_IntangibleAssetsNetExcludingGoodwill
Deferred financing costs, non-current 1,224us-gaap_DeferredFinanceCostsNoncurrentNet 23,307us-gaap_DeferredFinanceCostsNoncurrentNet
Total assets 32,426,759us-gaap_Assets 41,557,174us-gaap_Assets
Current liabilities:    
Accounts payable 1,818,831us-gaap_AccountsPayableCurrent 1,151,903us-gaap_AccountsPayableCurrent
Accrued expenses and other current liabilities 4,869,710us-gaap_AccruedLiabilitiesCurrent 4,067,916us-gaap_AccruedLiabilitiesCurrent
Deferred revenue, current 16,826us-gaap_DeferredRevenueCurrent 67,245us-gaap_DeferredRevenueCurrent
Capital lease obligation, current 20,191us-gaap_CapitalLeaseObligationsCurrent 21,316us-gaap_CapitalLeaseObligationsCurrent
Deferred rent, current 85,925us-gaap_DeferredRentCreditCurrent 34,366us-gaap_DeferredRentCreditCurrent
Bonds payable, current   125,000us-gaap_LongTermDebtCurrent
Loan payable net of discount, current 4,686,388us-gaap_LoansPayableCurrent 3,664,370us-gaap_LoansPayableCurrent
Total current liabilities 11,497,871us-gaap_LiabilitiesCurrent 9,132,116us-gaap_LiabilitiesCurrent
Capital lease obligation, non-current 9,230us-gaap_CapitalLeaseObligationsNoncurrent 29,422us-gaap_CapitalLeaseObligationsNoncurrent
Fair value of warrant liability 1,684,551stem_FairValueOfWarrantLiability 5,541,809stem_FairValueOfWarrantLiability
Other long-term liabilities 1,250,007stem_DepositsAndOtherLongTermLiabilities 801,388stem_DepositsAndOtherLongTermLiabilities
Loan payable net of discount, non-current 10,334,029us-gaap_LongTermLoansPayable 9,244,874us-gaap_LongTermLoansPayable
Deferred rent, non-current 1,734,214us-gaap_DeferredRentCreditNoncurrent 1,790,943us-gaap_DeferredRentCreditNoncurrent
Deferred revenue, non-current 46,084us-gaap_DeferredRevenueNoncurrent 62,910us-gaap_DeferredRevenueNoncurrent
Total liabilities 26,555,986us-gaap_Liabilities 26,603,462us-gaap_Liabilities
Commitments and contingencies (Note 12)      
Stockholders' equity:    
Common stock, $0.01 par value; 225,000,000 shares authorized; issued and outstanding 68,729,774 at December 31, 2014 and 55,138,311 at December 31, 2013 687,298us-gaap_CommonStockValue 551,383us-gaap_CommonStockValue
Additional paid-in capital 425,389,693us-gaap_AdditionalPaidInCapitalCommonStock 401,680,562us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (420,271,608)us-gaap_RetainedEarningsAccumulatedDeficit (387,530,334)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income 65,390us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 252,101us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 5,870,773us-gaap_StockholdersEquity 14,953,712us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 32,426,759us-gaap_LiabilitiesAndStockholdersEquity $ 41,557,174us-gaap_LiabilitiesAndStockholdersEquity