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Disaggregation of Revenues, Geographic Sales and Product Sales - Net Sales by Products and Services (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 03, 2020 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Jan. 03, 2020 | Dec. 28, 2018 | Dec. 29, 2017
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  |  |  |  |  |  | $ 20,863 | $ 22,872 | $ 22,286
Total net sales | $ 38,883 | $ 39,055 | $ 39,664 | $ 32,583 | $ 31,186 | $ 31,770 | $ 33,905 | $ 27,093 | 150,185 | 123,954 | 90,611
ICLs [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  |  |  |  |  |  | 129,322 | 101,082 | 68,325
IOLs [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  |  |  |  |  |  | 15,689 | 16,193 | 17,258
Other surgical products [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  |  |  |  |  |  | $ 5,174 | $ 6,679 | $ 5,028

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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