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Agreements With Endospan (Narrative) (Details) - Endospan [Member] - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 11, 2019
Sep. 30, 2019
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
Transaction and integration costs       $ 1,000,000.0
Per three tranches of funding   $ 5,000,000.0 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  
Endospan loan, fair value 358,000     358,000
Securities option agreement, fair value 4,800,000     4,800,000
Distribution agreements, fair value $ 9,800,000     $ 9,800,000
Distribution agreement, amortization period       5 years
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    
Interest rate on amounts borrowed   5.00%    
JOTEC [Member]        
Variable Interest Entity [Line Items]        
Distribution fee   $ 9,000,000.0 $ 9,000,000.0