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Agreements with Endospan (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Sep. 11, 2019
USD ($)
tranche
May 31, 2023
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Variable Interest Entity [Line Items]                  
Number of tranches | tranche   3              
Expense           $ 983,000 $ 4,241,000 $ 2,392,000 $ 3,278,000
Variable Interest Entity, Primary Beneficiary                  
Variable Interest Entity [Line Items]                  
Securities purchase option agreement         $ 1,000,000        
Option to purchase outstanding securities $ 250,000,000                
Securities purchase option agreement, expiration period         90 days        
Funding of loan agreement per tranche   $ 5,000,000              
Funded second tranche payment     $ 5,000,000 $ 5,000,000          
Required percentage of number of patients before tranche of loan funding can be acquired     50.00%            
Expense             5,000,000   5,000,000
Variable Interest Entity, Primary Beneficiary | Secured Debt                  
Variable Interest Entity [Line Items]                  
Loan provided   15,000,000              
Loans at fair value             $ 0   $ 0
Variable Interest Entity, Primary Beneficiary | Minimum                  
Variable Interest Entity [Line Items]                  
Option to purchase outstanding securities         $ 350,000,000.0        
Variable Interest Entity, Primary Beneficiary | Maximum                  
Variable Interest Entity [Line Items]                  
Option to purchase outstanding securities         $ 450,000,000        
JOTEC GmbH | Variable Interest Entity, Primary Beneficiary                  
Variable Interest Entity [Line Items]                  
Distribution fee   $ 9,000,000