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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net (loss) income $ (40,901)us-gaap_NetIncomeLoss $ (370)us-gaap_NetIncomeLoss $ 2,226us-gaap_NetIncomeLoss
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:      
Depreciation and amortization 16,813us-gaap_DepreciationDepletionAndAmortization 10,610us-gaap_DepreciationDepletionAndAmortization 9,883us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation expense 8,316us-gaap_ShareBasedCompensation 4,101us-gaap_ShareBasedCompensation 3,092us-gaap_ShareBasedCompensation
Intangible asset impairment 4,138us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 4,490us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
Change in fair value of contingent consideration liability and contingent consideration expense, net 1,006spnc_BusinessCombinationContingentConsiderationArrangementsChangeinAmountofContingentConsiderationandContingentConsiderationExpenseNet (4,298)spnc_BusinessCombinationContingentConsiderationArrangementsChangeinAmountofContingentConsiderationandContingentConsiderationExpenseNet 0spnc_BusinessCombinationContingentConsiderationArrangementsChangeinAmountofContingentConsiderationandContingentConsiderationExpenseNet
Amortization of debt issuance costs 562us-gaap_AmortizationOfFinancingCosts 0us-gaap_AmortizationOfFinancingCosts 0us-gaap_AmortizationOfFinancingCosts
Provision for excess and obsolete inventories 426us-gaap_InventoryWriteDown 213us-gaap_InventoryWriteDown 156us-gaap_InventoryWriteDown
Deferred income taxes (909)us-gaap_DeferredIncomeTaxExpenseBenefit 386us-gaap_DeferredIncomeTaxExpenseBenefit 378us-gaap_DeferredIncomeTaxExpenseBenefit
Indemnification costs paid 0spnc_AccruedPaidIndemnificationCosts 0spnc_AccruedPaidIndemnificationCosts (3,225)spnc_AccruedPaidIndemnificationCosts
License agreement settlement 0spnc_SettlementCostsLicenseAgreementDisputeAccruedPaid 0spnc_SettlementCostsLicenseAgreementDisputeAccruedPaid (3,000)spnc_SettlementCostsLicenseAgreementDisputeAccruedPaid
Changes in operating assets and liabilities:      
Trade accounts receivable, net (6,369)us-gaap_IncreaseDecreaseInAccountsReceivable (6,463)us-gaap_IncreaseDecreaseInAccountsReceivable (1,791)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (2,960)us-gaap_IncreaseDecreaseInInventories (359)us-gaap_IncreaseDecreaseInInventories (884)us-gaap_IncreaseDecreaseInInventories
Equipment held for rental or loan, net (9,232)us-gaap_PaymentsToAcquireEquipmentOnLease (6,812)us-gaap_PaymentsToAcquireEquipmentOnLease (6,099)us-gaap_PaymentsToAcquireEquipmentOnLease
Prepaid expenses and other current assets (5,028)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (265)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (77)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets (91)us-gaap_IncreaseDecreaseInOtherOperatingAssets 31us-gaap_IncreaseDecreaseInOtherOperatingAssets 99us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and accrued liabilities 13,650us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 3,343us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 4,399us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue 130us-gaap_IncreaseDecreaseInDeferredRevenue (394)us-gaap_IncreaseDecreaseInDeferredRevenue 4us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash (used in) provided by operating activities (20,449)us-gaap_NetCashProvidedByUsedInOperatingActivities 4,213us-gaap_NetCashProvidedByUsedInOperatingActivities 5,161us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Capital expenditures (6,722)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,620)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,079)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisition-related payments (233,978)us-gaap_PaymentsToAcquireBusinessesGross (6,500)us-gaap_PaymentsToAcquireBusinessesGross (7,727)us-gaap_PaymentsToAcquireBusinessesGross
Net cash used in investing activities (240,700)us-gaap_NetCashProvidedByUsedInInvestingActivities (11,120)us-gaap_NetCashProvidedByUsedInInvestingActivities (10,806)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Proceeds from issuance of convertible senior notes 230,000us-gaap_ProceedsFromConvertibleDebt 0us-gaap_ProceedsFromConvertibleDebt 0us-gaap_ProceedsFromConvertibleDebt
Debt issuance costs, convertible senior notes (7,474)us-gaap_PaymentsOfDebtIssuanceCosts 0us-gaap_PaymentsOfDebtIssuanceCosts 0us-gaap_PaymentsOfDebtIssuanceCosts
Net proceeds from stock offering 0us-gaap_ProceedsFromIssuanceOfCommonStock 92,034us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from the exercise of stock options and employee stock purchase plan 5,717us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 5,225us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 3,772us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Net cash provided by financing activities 228,243us-gaap_NetCashProvidedByUsedInFinancingActivities 97,259us-gaap_NetCashProvidedByUsedInFinancingActivities 3,772us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash 16us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 268us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 10us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (decrease) increase in cash and cash equivalents (32,890)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 90,620us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,863)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 128,395us-gaap_CashAndCashEquivalentsAtCarryingValue 37,775us-gaap_CashAndCashEquivalentsAtCarryingValue 39,638us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 95,505us-gaap_CashAndCashEquivalentsAtCarryingValue 128,395us-gaap_CashAndCashEquivalentsAtCarryingValue 37,775us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information:      
Cash paid during the year for interest 3,031us-gaap_InterestPaid 41us-gaap_InterestPaid 46us-gaap_InterestPaid
Cash paid during the year for income taxes $ 787us-gaap_IncomeTaxesPaidNet $ 357us-gaap_IncomeTaxesPaidNet $ 135us-gaap_IncomeTaxesPaidNet