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Segment and Geographic Information (Revenue by Product Type) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue from External Customer [Line Items]
Revenue	$ 46,994	$ 41,273
United States [Member]
Revenue from External Customer [Line Items]
Revenue	38,436	33,268
United States [Member] | Open-heart Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	17,579	15,705
United States [Member] | Minimally Invasive Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	8,613	8,282
United States [Member] | Appendage Management [Member]
Revenue from External Customer [Line Items]
Revenue	11,797	8,702
United States [Member] | Ablation And Appendage Management [Member]
Revenue from External Customer [Line Items]
Revenue	37,989	32,689
United States [Member] | Valve Tools [Member]
Revenue from External Customer [Line Items]
Revenue	447	579
International [Member]
Revenue from External Customer [Line Items]
Revenue	8,558	8,005
International [Member] | Open-heart Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	4,909	4,590
International [Member] | Minimally Invasive Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	1,792	1,958
International [Member] | Appendage Management [Member]
Revenue from External Customer [Line Items]
Revenue	1,798	1,395
International [Member] | Ablation And Appendage Management [Member]
Revenue from External Customer [Line Items]
Revenue	8,499	7,943
International [Member] | Valve Tools [Member]
Revenue from External Customer [Line Items]
Revenue	$ 59	$ 62

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+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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