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Agreements with Endospan (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 11, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) tranche | Dec. 31, 2021 USD ($) | Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Securities purchase option agreement, expiration period |  |  |  |  | 90 days |  |
Number of tranches | tranche |  |  |  |  | 3 |  |
Endospan |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Securities purchase option agreement | $ 1,000,000 |  | $ 1,000,000 |  |  |  |
Per three tranches of funding | $ 5,000,000 |  |  |  |  |  |
Funded second tranche payment |  | $ 5,000,000 |  |  |  |  |
Required percentage of number of patients before third tranche of loan funding can be acquired | 50.00% |  |  |  |  |  |
Investment in VIE | $ 15,000,000 |  |  |  | $ 20,000,000 |  |
Additional amounts |  | $ 5,000,000 |  |  |  |  |
Endospan loan, fair value |  |  |  |  |  |  | $ 358,000
Distribution agreements, fair value |  |  |  | $ 5,500,000 | $ 3,500,000 | $ 5,500,000 |
Asset impairment |  |  |  | $ 4,900,000 |  |  |
Expense from fair value adjustment |  |  |  |  |  | $ 409,000 |
Endospan | Minimum |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Option to purchase outstanding securities |  |  | 350,000,000.0 |  |  |  |
Endospan | Maximum |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Option to purchase outstanding securities |  |  | $ 450,000,000 |  |  |  |
Secured Debt | Endospan |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Loan provided | 15,000,000 |  |  |  |  |  |
JOTEC GmbH | Endospan |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Distribution fee | $ 9,000,000 |  |  |  |  |  |

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