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Segment and Geographic Information (Revenue by Product Type) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue from External Customer [Line Items]
Revenue	$ 31,423	$ 26,678	$ 93,892	$ 78,039
United States [Member]
Revenue from External Customer [Line Items]
Revenue	24,665	20,060	73,332	58,106
United States [Member] | Open-heart Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	13,041	11,265	39,043	32,498
United States [Member] | Minimally Invasive Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	5,011	3,933	14,415	11,774
United States [Member] | AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	5,927	4,285	17,716	11,856
United States [Member] | Ablation and AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	23,979	19,483	71,174	56,128
United States [Member] | Valve Tools [Member]
Revenue from External Customer [Line Items]
Revenue	686	577	2,158	1,978
International [Member]
Revenue from External Customer [Line Items]
Revenue	6,758	6,618	20,560	19,933
International [Member] | Open-heart Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	4,092	4,150	12,396	12,175
International [Member] | Minimally Invasive Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	1,945	1,804	5,771	5,773
International [Member] | AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	598	543	2,058	1,390
International [Member] | Ablation and AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	6,635	6,497	20,225	19,338
International [Member] | Valve Tools [Member]
Revenue from External Customer [Line Items]
Revenue	$ 123	$ 121	$ 335	$ 595

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+ References

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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=26872669&loc=d3e20235-122688

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