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Segment and Geographic Information (Revenue by Product Type) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Revenue	$ 46,062	$ 42,150	$ 45,231	$ 41,273	$ 41,157	$ 38,340	$ 39,672	$ 35,940	$ 174,716	$ 155,109	$ 129,755
United States [Member]
Revenue from External Customer [Line Items]
Revenue									138,387	122,385	102,212
United States [Member] | Open-heart Ablation [Member]
Revenue from External Customer [Line Items]
Revenue									64,517	58,050	53,541
United States [Member] | Minimally Invasive Ablation [Member]
Revenue from External Customer [Line Items]
Revenue									34,421	31,169	21,564
United States [Member] | AtriClip Devices [Member]
Revenue from External Customer [Line Items]
Revenue									37,281	30,321	24,377
United States [Member] | Ablation and AtriClip Devices [Member]
Revenue from External Customer [Line Items]
Revenue									136,219	119,540	99,482
United States [Member] | Valve Tools [Member]
Revenue from External Customer [Line Items]
Revenue									2,168	2,845	2,730
International [Member]
Revenue from External Customer [Line Items]
Revenue									36,329	32,724	27,543
International [Member] | Open-heart Ablation [Member]
Revenue from External Customer [Line Items]
Revenue									20,718	20,189	16,287
International [Member] | Minimally Invasive Ablation [Member]
Revenue from External Customer [Line Items]
Revenue									8,007	8,065	7,964
International [Member] | AtriClip Devices [Member]
Revenue from External Customer [Line Items]
Revenue									7,251	3,986	2,868
International [Member] | Ablation and AtriClip Devices [Member]
Revenue from External Customer [Line Items]
Revenue									35,976	32,240	27,119
International [Member] | Valve Tools [Member]
Revenue from External Customer [Line Items]
Revenue									$ 353	$ 484	$ 424

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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=63488584&loc=d3e20235-122688

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