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Agreements With Endospan (Narrative) (Details) - Endospan [Member] - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 11, 2019
Sep. 30, 2019
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]          
Securities purchase option agreement $ 1,000,000.0 $ 1,000,000.0      
Securities purchase option agreement, expiration period       90 days  
Per three tranches of funding $ 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     $ 15,000,000.0  
Additional amounts     $ 0 0  
Endospan loan, fair value   358,000      
Securities option agreement, fair value     4,800,000 4,800,000  
Distribution agreements, fair value     $ 8,200,000 $ 8,200,000 $ 9,800,000
Minimum [Member]          
Variable Interest Entity [Line Items]          
Option to purchase outstanding securities   350,000,000.0      
Maximum [Member]          
Variable Interest Entity [Line Items]          
Option to purchase outstanding securities   $ 450,000,000.0      
Secured Debt [Member]          
Variable Interest Entity [Line Items]          
Loan amount 15,000,000.0        
JOTEC (including NEXUS) [Member]          
Variable Interest Entity [Line Items]          
Distribution fee $ 9,000,000.0