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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net loss $ (9,350,701)us-gaap_NetIncomeLoss $ (7,620,256)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 269,604us-gaap_DepreciationDepletionAndAmortization 335,855us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation 1,308,894us-gaap_ShareBasedCompensation 521,106us-gaap_ShareBasedCompensation
Amortization of debt discount and issuance costs 42,206stem_AmortizationOfDebtDiscountAndDebtIssuanceCosts 72,836stem_AmortizationOfDebtDiscountAndDebtIssuanceCosts
Gain on disposal of fixed assets (148,713)us-gaap_GainLossOnDispositionOfAssets  
Change in fair value of warrant liability 347,330us-gaap_FairValueAdjustmentOfWarrants 326,624us-gaap_FairValueAdjustmentOfWarrants
Changes in operating assets and liabilities:    
Trade receivables 138,071us-gaap_IncreaseDecreaseInAccountsReceivable 8,662us-gaap_IncreaseDecreaseInAccountsReceivable
Accrued interest and other receivables 85,317stem_IncreaseDecreaseInAccruedInterestAndOtherReceivables 387,686stem_IncreaseDecreaseInAccruedInterestAndOtherReceivables
Prepaid and other current assets 46,312us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 102,895us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses (1,630,659)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (637,190)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue (4,206)us-gaap_IncreaseDecreaseInDeferredRevenue (10,340)us-gaap_IncreaseDecreaseInDeferredRevenue
Deferred rent (10,670)stem_IncreaseDecreaseInDeferredRent 4,576stem_IncreaseDecreaseInDeferredRent
Net cash used in operating activities (8,907,215)us-gaap_NetCashProvidedByUsedInOperatingActivities (6,507,546)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Purchases of property, plant and equipment (221,782)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (230,689)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property, plant and equipment 148,713us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment  
Net cash used in investing activities (73,069)us-gaap_NetCashProvidedByUsedInInvestingActivities (230,689)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Proceeds from loan payable   3,820,264us-gaap_ProceedsFromNotesPayable
Payments related to net share issuance of stock based awards (142,683)us-gaap_PaymentsOfStockIssuanceCosts (201,462)us-gaap_PaymentsOfStockIssuanceCosts
Repayment of capital lease obligations (5,573)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (5,186)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Repayment of loan payable (1,681,664)us-gaap_RepaymentsOfLongTermDebt (998,089)us-gaap_RepaymentsOfLongTermDebt
Net cash provided by (used in) financing activities (1,829,920)us-gaap_NetCashProvidedByUsedInFinancingActivities 2,615,527us-gaap_NetCashProvidedByUsedInFinancingActivities
Decrease in cash and cash equivalents (10,810,204)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (4,122,708)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Effects of foreign exchange rate changes on cash (31,498)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 909us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Cash and cash equivalents, beginning of period 24,987,603us-gaap_CashAndCashEquivalentsAtCarryingValue 30,585,424us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 14,145,901us-gaap_CashAndCashEquivalentsAtCarryingValue 26,463,625us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:    
Interest paid $ 78,508us-gaap_InterestPaid $ 141,249us-gaap_InterestPaid