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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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- 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=26872669&loc=d3e20235-122688 + Details
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