Financial Instruments (Tables)	12 Months Ended
Dec. 31, 2021
Financial Instruments [Abstract]
Summary Of Financial Instruments Measured At Fair Value	December 31, 2021Level 1 Level 2 Level 3 TotalCash equivalents: Money market funds$ 10,015 -- -- $ 10,015Total assets$ 10,015 $ -- $ -- $ 10,015 Long-term liabilities: Contingent consideration -- -- (49,400) (49,400)Total liabilities $ -- $ -- $ (49,400) $ (49,400) December 31, 2020Level 1 Level 2 Level 3 TotalCash equivalents: Money market funds$ 11,484 -- -- $ 11,484Restricted securities: Money market funds 546 -- -- 546Endospan loan -- -- 409 409Total assets$ 12,030 $ -- $ 409 $ 12,439 Current liabilities: Contingent consideration -- -- (16,430) (16,430) Long-term liabilities: Contingent consideration -- -- (43,500) (43,500)Total liabilities$ -- $ -- $ (59,930) $ (59,930)
Reconciliation Of Changes In Fair Value Of Level 3 Liabilities	Endospan Loan Contingent ConsiderationBalance as of December 31, 2020$ 409 $ (59,930)Payments -- 20,000Change in valuation (409) (9,470)Balance as of December 31, 2021$ -- $ (49,400)

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258

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