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Disaggregation of Revenues, Geographic Sales and Product Sales (Details 2) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 30, 2018 | Mar. 31, 2017
Product Information [Line Items] |  |
Sales Revenue, Goods, Net | $ 5,935 | $ 5,079
Net sales | 27,093 | 20,350
ICLs [Member] |  |
Product Information [Line Items] |  |
Sales Revenue, Goods, Net | 21,158 | 15,271
IOLs [Member] |  |
Product Information [Line Items] |  |
Sales Revenue, Goods, Net | 4,058 | 4,606
Other surgical products [Member] |  |
Product Information [Line Items] |  |
Sales Revenue, Goods, Net | $ 1,877 | $ 473

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + 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(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + 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 + Details
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