Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 72,207	$ 65,131	$ 219,442	$ 185,331
Domestic Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	36,129	36,249	111,291	102,813
International Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	25,458	20,764	79,219	56,638
International Distributors [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	10,544	8,035	28,694	25,522
CardioGenesis Cardiac Laser Therapy [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 76	$ 83	$ 238	$ 358