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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Line Items]      
U.S. Federal Income Tax Rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Income tax (benefit) expense $ (322,000)us-gaap_IncomeTaxExpenseBenefit $ 780,000us-gaap_IncomeTaxExpenseBenefit $ 734,000us-gaap_IncomeTaxExpenseBenefit
Deferred Federal Income Tax Expense (Benefit) (874,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 301,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 295,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Release of valuation allowance related to AngioScore acquisition (1,266,000)spnc_EffectiveIncomeTaxRateReconciliationValuationAllowanceReductionAcquisition 0spnc_EffectiveIncomeTaxRateReconciliationValuationAllowanceReductionAcquisition 0spnc_EffectiveIncomeTaxRateReconciliationValuationAllowanceReductionAcquisition
Tax Benefit from Stock Options Exercised 3,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 1,400,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 700,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Operating Loss Carryforwards 156,000,000us-gaap_OperatingLossCarryforwards    
Undistributed Earnings of Foreign Subsidiaries (20,000,000)us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Unrecognized Tax Benefits 100,000us-gaap_UnrecognizedTaxBenefits    
Unrecognized Tax Benefits, Period Increase (Decrease) (200,000)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease    
Capital Loss Carryforward      
Income Tax Disclosure [Line Items]      
Tax Credit Carryforward, Amount 1,100,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_CapitalLossCarryforwardMember		    
Alternative minimum tax carryforward      
Income Tax Disclosure [Line Items]      
Operating Loss Carryforwards 155,200,000us-gaap_OperatingLossCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= spnc_AlternativeMinimumTaxCarryforwardMember		    
Tax Credit Carryforward, Amount 300,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= spnc_AlternativeMinimumTaxCarryforwardMember		    
Research Tax Credit Carryforward      
Income Tax Disclosure [Line Items]      
Tax Credit Carryforward, Amount 3,100,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember		    
AngioScore      
Income Tax Disclosure [Line Items]      
Deferred Federal Income Tax Expense (Benefit) (1,300,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
/ us-gaap_BusinessAcquisitionAxis
= spnc_AngioScoreMember		    
Deferred Income Tax Charge | AngioScore      
Income Tax Disclosure [Line Items]      
Income tax (benefit) expense $ (1,300,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_BusinessAcquisitionAxis
= spnc_AngioScoreMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_DeferredIncomeTaxChargesMember