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Agreement With Endopsan (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 11, 2019
Sep. 30, 2019
Sep. 30, 2019
Variable Interest Entity [Line Items]        
Obligated minimum purchase amount, year it starts       2020
Endospan loan, fair value $ 358,000   $ 358,000 $ 358,000
Distribution agreement, amortization period       5 years
Endospan [Member]        
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    
Endospan loan, fair value 358,000,000,000   358,000,000,000 $ 358,000,000,000
Securities option agreement, fair value 4,800,000   4,800,000 4,800,000
Distribution agreements, fair value $ 9,800,000   9,800,000 $ 9,800,000
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 amount   $ 15,000,000.0    
Interest rate on amounts borrowed   5.00%    
JOTEC [Member] | Endospan [Member]        
Variable Interest Entity [Line Items]        
Distribution fee   $ 9,000,000.0    
Product duration for agreement to expire       6 months