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Net gain on sale of vascular operations (Details) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2010
Dec. 31, 2010
Mar. 31, 2010
Vascular operation
agreement
Y
D
M
Sep. 30, 2010
Vascular operation
agreement
Dec. 31, 2011
Vascular operation
Sale of non-core operations          
Proceeds from sale of non-core operations   $ 24,215,000     $ (24,215,000)
Gain on sale of non-core operations 12,019,000 12,019,000     12,019,000
Proceeds from sale of non-core operations, net of litigation     $ 27,700,000    
Period of operational support with respect to the transferred assets, maximum (in months)     5    
Number of supply agreements covered by transition services agreement     2    
Period of supply agreements (in years)     2    
Period of agreement to provide other products (in days)     90    
Number of supply agreements completed       1  
Period of noncompetition agreement (in years)     5