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Acquisition Of JOTEC (Pro Forma Information) (Details) - JOTEC [Member] - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Total revenues |  | $ 236,209 | $ 224,896
Net loss | $ (1,500) | $ (736) | $ (1,966)
Pro forma loss per common share - basic |  | $ (0.02) | $ (0.06)
Pro forma loss per common share - diluted |  | $ (0.02) | $ (0.06)

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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