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Revenue (Revenue By Product Type) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue from External Customer [Line Items]
Revenue	$ 84,529	$ 71,376	$ 159,105	$ 130,651
United States
Revenue from External Customer [Line Items]
Revenue	71,265	60,070	133,537	110,379
United States | Total ablation
Revenue from External Customer [Line Items]
Revenue	42,434	34,914	78,037	64,636
United States | Open ablation
Revenue from External Customer [Line Items]
Revenue	22,070	19,503	41,044	36,942
United States | Minimally invasive ablation
Revenue from External Customer [Line Items]
Revenue	10,154	9,702	18,769	18,087
United States | Pain management
Revenue from External Customer [Line Items]
Revenue	10,210	5,709	18,224	9,607
United States | Appendage management
Revenue from External Customer [Line Items]
Revenue	28,831	25,156	55,500	45,743
Total International
Revenue from External Customer [Line Items]
Revenue	13,264	11,306	25,568	20,272
Total International | Total ablation
Revenue from External Customer [Line Items]
Revenue	7,598	7,112	15,763	12,820
Total International | Open ablation
Revenue from External Customer [Line Items]
Revenue	6,213	5,526	12,705	9,960
Total International | Minimally invasive ablation
Revenue from External Customer [Line Items]
Revenue	1,271	1,575	2,804	2,849
Total International | Pain management
Revenue from External Customer [Line Items]
Revenue	114	11	254	11
Total International | Appendage management
Revenue from External Customer [Line Items]
Revenue	$ 5,666	$ 4,194	$ 9,805	$ 7,452

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