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Agreements With Endospan (Narrative) (Details) - Endospan [Member] - USD ($) |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 11, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2021 | Dec. 31, 2020 | 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 |  |
Per three tranches of funding | $ 5,000,000.0 |  |  |  |  |
Funded second tranche payment |  | $ 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 |  |  | $ 20,000,000.0 |  |
Additional amounts |  | $ 5,000,000.0 |  |  |  |
Endospan loan, fair value |  |  |  | 409,000 | $ 409,000 | $ 358,000
Securities option agreement, fair value |  |  |  | 4,800,000 | 4,800,000 |
Distribution agreements, fair value |  |  |  | $ 6,100,000 | $ 8,000,000.0 |
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 provided | 15,000,000.0 |  |  |  |  |
JOTEC GmbH [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Distribution fee | $ 9,000,000.0 |  |  |  |  |

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- Definition Distribution Agreements, Fair Value + References No definition available. + Details
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- Definition Exclusive Distribution Agreement, Distribution Fee + References No definition available. + Details
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- Definition Funded Tranche Payment Per Agreement + References No definition available. + Details
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- Definition Securites Purchase Option Agreement, Expiration Period + References No definition available. + Details
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- Definition Securities Option Agreement, Fair Value + References No definition available. + Details
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- Definition Securities Purchase Option Agreement + References No definition available. + Details
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- Definition Securities Purchase Option Agreement, Option To Acquire Oustanding Securities, Amount + References No definition available. + Details
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- Definition Third Tranche Of Funding For Secured Loan, Minimum Percentage Of Required Number Of Patients + References No definition available. + Details
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- Definition Three Tranches Of Funding For Secured Loan Per Tranche + References No definition available. + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition The amount of financial or other support the reporting entity has provided (explicitly or implicitly) to the Variable Interest Entity (VIE) that it was not previously contractually required to provide or that the reporting entity intends to provide, including, for example, situations in which the reporting entity assisted the VIE in obtaining another type of support. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685 + Details
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