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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 |  |  |  |  |  |  |

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