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Consolidated Statements of Cash Flows (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating expenses:    
Net loss $ (357,045)us-gaap_NetIncomeLoss $ (518,214)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 944us-gaap_Depreciation 886us-gaap_Depreciation
Amortization of debt issuance costs 5,204us-gaap_AmortizationOfFinancingCosts 22,415us-gaap_AmortizationOfFinancingCosts
Accretion of discount on convertible debentures 101,208us-gaap_AccretionOfDiscount 117,723us-gaap_AccretionOfDiscount
Interest income on short-term investment (6)us-gaap_InvestmentIncomeInterest (8)us-gaap_InvestmentIncomeInterest
Change in fair value of financial instruments (385,891)us-gaap_GainLossOnDerivativeInstrumentsNetPretax 80,215us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Stock-based compensation 48,115us-gaap_ShareBasedCompensation 30,695us-gaap_ShareBasedCompensation
Vesting of consultant stock    62,143sgbx_ReturnVestingConsultantStock
Changes in operating assets and liabilities:    
Accounts receivable (173,689)us-gaap_IncreaseDecreaseInAccountsReceivable 7,888us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory (362,856)us-gaap_IncreaseDecreaseInInventories 5,602us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets (10,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 1,776us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses 63,625us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (48,814)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accrued interest, related party 2,021us-gaap_IncreaseDecreaseInDueToOtherRelatedPartiesCurrent 2,021us-gaap_IncreaseDecreaseInDueToOtherRelatedPartiesCurrent
Accrued interest 79,914us-gaap_IncreaseDecreaseInInterestPayableNet 41,440us-gaap_IncreaseDecreaseInInterestPayableNet
Related party accounts payable and accrued expenses 165,099us-gaap_IncreaseDecreaseInAccountsPayableRelatedParties (108,243)us-gaap_IncreaseDecreaseInAccountsPayableRelatedParties
Billings in excess of costs and estimated earnings -on uncompleted contracts (921)us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings (1,734)us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings
Deferred revenue 518,682us-gaap_IncreaseDecreaseInDeferredRevenue (202,759)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash used in operating activities (305,596)us-gaap_NetCashProvidedByUsedInOperatingActivities (506,968)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows used in investing activities    
Purchase of equipment    (607)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities    (607)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Expenditures on debt issuance costs    (20,000)sgbx_ExpendituresOnDebtIssuanceCost
Proceeds from excercise of common stock options    10,000us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by financing activities    (10,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net decrease in cash and cash equivalents (305,596)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (517,575)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents - beginning of year 884,188us-gaap_CashAndCashEquivalentsAtCarryingValue 594,248us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents - end of year 578,592us-gaap_CashAndCashEquivalentsAtCarryingValue 76,673us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the period for:    
Interest