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Segment and Geographic Information (Revenue by Product Type) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue from External Customer [Line Items]
Revenue	$ 45,231	$ 39,672	$ 86,504	$ 75,612
United States [Member]
Revenue from External Customer [Line Items]
Revenue	35,534	30,872	68,802	59,144
United States [Member] | Open-heart Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	16,790	14,721	32,495	28,689
United States [Member] | Minimally Invasive Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	8,725	7,990	17,007	14,715
United States [Member] | AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	9,463	7,348	18,165	14,196
United States [Member] | Ablation and AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	34,978	30,059	67,667	57,600
United States [Member] | Valve Tools [Member]
Revenue from External Customer [Line Items]
Revenue	556	813	1,135	1,544
International [Member]
Revenue from External Customer [Line Items]
Revenue	9,697	8,800	17,702	16,468
International [Member] | Open-heart Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	5,674	5,438	10,264	9,910
International [Member] | Minimally Invasive Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	2,135	2,186	4,093	4,350
International [Member] | AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	1,777	1,024	3,172	1,889
International [Member] | Ablation and AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	9,586	8,648	17,529	16,149
International [Member] | Valve Tools [Member]
Revenue from External Customer [Line Items]
Revenue	$ 111	$ 152	$ 173	$ 319

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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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