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Statements Of Cash Flows (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities      
Net loss $ (5,202,441)us-gaap_NetIncomeLoss $ (68,757,589)us-gaap_NetIncomeLoss $ (9,238,427)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to cash used in operating activities:      
Depreciation 413,773us-gaap_Depreciation 919,136us-gaap_Depreciation 1,300,188us-gaap_Depreciation
Amortization of intangibles 299,833us-gaap_AmortizationOfIntangibleAssets 299,833us-gaap_AmortizationOfIntangibleAssets 299,833us-gaap_AmortizationOfIntangibleAssets
Amortization of deferred finance costs and debt discount 240,601us-gaap_AmortizationOfFinancingCostsAndDiscounts 7,703,336us-gaap_AmortizationOfFinancingCostsAndDiscounts 2,977,119us-gaap_AmortizationOfFinancingCostsAndDiscounts
Share-based compensation 1,501,045us-gaap_ShareBasedCompensation 1,050,260us-gaap_ShareBasedCompensation 2,293,731us-gaap_ShareBasedCompensation
Gain on debt conversion     (75,612)stxs_GainLossOnDebtConversion
Loss on asset disposal   36,103us-gaap_GainLossOnDispositionOfAssets 12,444us-gaap_GainLossOnDispositionOfAssets
Adjustment of warrants and convertible debt features (3,510,439)us-gaap_DerivativeGainLossOnDerivativeNet 47,450,066us-gaap_DerivativeGainLossOnDerivativeNet (8,189,895)us-gaap_DerivativeGainLossOnDerivativeNet
Interest due from issuance of stock    551,296stxs_InterestDueFromIssuanceOfStock 192,128stxs_InterestDueFromIssuanceOfStock
Changes in operating assets and liabilities:      
Accounts receivable 1,098,084us-gaap_IncreaseDecreaseInAccountsReceivable 4,065,106us-gaap_IncreaseDecreaseInAccountsReceivable (428,079)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (1,492,864)us-gaap_IncreaseDecreaseInInventories 219,202us-gaap_IncreaseDecreaseInInventories 937,810us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 144,518us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 429,025us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (760,474)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets 110,763us-gaap_IncreaseDecreaseInOtherOperatingAssets (1,376)us-gaap_IncreaseDecreaseInOtherOperatingAssets 7,773us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable (1,159,206)us-gaap_IncreaseDecreaseInAccountsPayable (44,349)us-gaap_IncreaseDecreaseInAccountsPayable (2,053,493)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities (1,564,617)us-gaap_IncreaseDecreaseInAccruedLiabilities 1,717,571us-gaap_IncreaseDecreaseInAccruedLiabilities (514,689)us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred revenue (376,499)us-gaap_IncreaseDecreaseInDeferredRevenue (1,969,264)us-gaap_IncreaseDecreaseInDeferredRevenue 1,125,079us-gaap_IncreaseDecreaseInDeferredRevenue
Other liabilities 405,306us-gaap_IncreaseDecreaseInOtherOperatingLiabilities   (3,094)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash used in operating activities (9,092,143)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (6,331,644)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (12,117,658)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities      
Purchase of equipment (123,912)us-gaap_PaymentsToAcquireMachineryAndEquipment   (130,699)us-gaap_PaymentsToAcquireMachineryAndEquipment
Net cash used in investing activities (123,912)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations   (130,699)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities      
Payments of term loan   (4,000,000)us-gaap_RepaymentsOfLongTermDebt (4,000,000)us-gaap_RepaymentsOfLongTermDebt
Proceeds from revolving line of credit   37,237,131us-gaap_ProceedsFromLinesOfCredit 54,806,154us-gaap_ProceedsFromLinesOfCredit
Payments of revolving line of credit    (44,490,148)us-gaap_RepaymentsOfLinesOfCredit (62,842,934)us-gaap_RepaymentsOfLinesOfCredit
Proceeds from subordinated convertible debt, net of issuance costs     7,738,351stxs_ProceedsFromConvertibleDebtNetOfIssuanceCosts
Proceeds from Healthcare Royalty Partners debt   2,546,328us-gaap_ProceedsFromIssuanceOfSecuredDebt 2,500,000us-gaap_ProceedsFromIssuanceOfSecuredDebt
Payments of Healthcare Royalty Partners debt (142,447)us-gaap_RepaymentsOfSecuredDebt (263,192)us-gaap_RepaymentsOfSecuredDebt (1,252,647)us-gaap_RepaymentsOfSecuredDebt
Proceeds from issuance of stock and warrants, net of issuance costs 2,853,673stxs_ProceedsFromIssuanceOfStockAndWarrantsNetOfIssuanceCosts 21,298,937stxs_ProceedsFromIssuanceOfStockAndWarrantsNetOfIssuanceCosts 9,122,232stxs_ProceedsFromIssuanceOfStockAndWarrantsNetOfIssuanceCosts
Net cash provided by financing activities 2,711,226us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 12,329,056us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 6,071,156us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents (6,504,829)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 5,997,412us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (6,177,201)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 13,775,130us-gaap_CashAndCashEquivalentsAtCarryingValue 7,777,718us-gaap_CashAndCashEquivalentsAtCarryingValue 13,954,919us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 7,270,301us-gaap_CashAndCashEquivalentsAtCarryingValue 13,775,130us-gaap_CashAndCashEquivalentsAtCarryingValue 7,777,718us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information:      
Interest Paid $ 3,028,884us-gaap_InterestPaid $ 3,187,353us-gaap_InterestPaid $ 3,258,900us-gaap_InterestPaid