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Agreements With Endospan (Narrative) (Details)
1 Months Ended 12 Months Ended
Sep. 11, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Variable Interest Entity [Line Items]          
Securities purchase option agreement, expiration period       90 days  
Number of tranches | item       3  
Endospan [Member]          
Variable Interest Entity [Line Items]          
Securities purchase option agreement $ 1,000,000.0   $ 1,000,000.0    
Per three tranches of funding $ 5,000,000.0        
Funded second tranche payment   $ 5,000,000.0      
Required percentage of number of patients before third tranche of loan funding can be acquired 50.00%        
Investment in VIE $ 15,000,000.0     $ 20,000,000.0  
Additional amounts   $ 5,000,000.0      
Endospan loan, fair value       409,000 $ 358,000
Securities option agreement, fair value       4,800,000 4,800,000
Distribution agreements, fair value       8,000,000.0 $ 9,800,000
Expense from fair value adjustment       $ 4,900,000  
Endospan [Member] | Minimum [Member]          
Variable Interest Entity [Line Items]          
Option to purchase outstanding securities     350,000,000.0    
Endospan [Member] | Maximum [Member]          
Variable Interest Entity [Line Items]          
Option to purchase outstanding securities     $ 450,000,000.0    
Secured Debt [Member] | Endospan [Member]          
Variable Interest Entity [Line Items]          
Loan provided 15,000,000.0        
JOTEC GmbH [Member] | Endospan [Member]          
Variable Interest Entity [Line Items]          
Distribution fee $ 9,000,000.0