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Revolving Credit Facility - Additional Information (Detail) (USD $)
0 Months Ended
Nov. 04, 2013
Dec. 31, 2014
Nov. 05, 2014
Line of Credit Facility [Line Items]      
Credit facility initiation date Nov. 04, 2013    
Revolving credit facility amount $ 20,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity    
Credit facility fee percentage 0.20%us-gaap_LineOfCreditFacilityCommitmentFeePercentage    
Line of Credit Facility, Expiration Period 3 years    
Debt outstanding   0us-gaap_LongTermDebt  
Minimum [Member]      
Line of Credit Facility [Line Items]      
Credit facility interest rate 1.375%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]      
Line of Credit Facility [Line Items]      
Credit facility interest rate 2.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Maximum [Member] | Stock Repurchase Plan [Member]      
Line of Credit Facility [Line Items]      
Revolving credit facility amount     $ 30,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_AwardTypeAxis
= srdx_StockRepurchasePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember