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Other Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Mar. 31, 2013
Sep. 30, 2006
CeloNova BioSciences, Inc. [Member] | Maximum [Member]      
Schedule of Investments [Line Items]      
Company's ownership percentage 2.00%srdx_CostMethodInvestmentOwnershipPercentage
/ us-gaap_InvestmentTypeAxis
= srdx_CelonovaBiosciencesIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
ViaCyte, Inc. [Member]      
Schedule of Investments [Line Items]      
Impairment loss on investment $ 5.3us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_InvestmentTypeAxis
= srdx_ViacyteIncMember		 $ 0.1us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_InvestmentTypeAxis
= srdx_ViacyteIncMember		 $ 4.7us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_InvestmentTypeAxis
= srdx_ViacyteIncMember
Cost method of investment $ 0.5us-gaap_CostMethodInvestments
/ us-gaap_InvestmentTypeAxis
= srdx_ViacyteIncMember		    
ViaCyte, Inc. [Member] | Maximum [Member]      
Schedule of Investments [Line Items]      
Company's ownership percentage 1.00%srdx_CostMethodInvestmentOwnershipPercentage
/ us-gaap_InvestmentTypeAxis
= srdx_ViacyteIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember