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