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Revenue (Revenue By Product Type) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from External Customer [Line Items]
Revenue	$ 83,246	$ 70,460	$ 242,351	$ 201,111
United States
Revenue from External Customer [Line Items]
Revenue	69,776	57,537	203,313	167,916
United States | Total ablation
Revenue from External Customer [Line Items]
Revenue	42,156	34,136	120,193	98,772
United States | Open ablation
Revenue from External Customer [Line Items]
Revenue	21,569	17,893	62,613	54,835
United States | Minimally invasive ablation
Revenue from External Customer [Line Items]
Revenue	10,077	9,990	28,846	28,077
United States | Pain management
Revenue from External Customer [Line Items]
Revenue	10,510	6,253	28,734	15,860
United States | Appendage management
Revenue from External Customer [Line Items]
Revenue	27,620	23,401	83,120	69,144
Total International
Revenue from External Customer [Line Items]
Revenue	13,470	12,923	39,038	33,195
Total International | Total ablation
Revenue from External Customer [Line Items]
Revenue	8,246	8,550	24,009	21,370
Total International | Open ablation
Revenue from External Customer [Line Items]
Revenue	6,680	6,690	19,385	16,650
Total International | Minimally invasive ablation
Revenue from External Customer [Line Items]
Revenue	1,445	1,849	4,249	4,698
Total International | Pain management
Revenue from External Customer [Line Items]
Revenue	121	11	375	22
Total International | Appendage management
Revenue from External Customer [Line Items]
Revenue	$ 5,224	$ 4,373	$ 15,029	$ 11,825

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