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Business Segments - Schedule of Revenue Information by Product (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2021 | Jun. 27, 2020 | Jul. 03, 2021 | Jun. 27, 2020
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Total revenues |  | $ 13,426 | $ 6,219 | $ 25,385 | $ 15,240
Cyclo G6 |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Total revenues |  | 3,599 | 2,113 | 6,948 | 5,036
Retina |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Total revenues |  | 7,575 | 2,608 | 14,235 | 6,742
Other |  |  |  |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |  |  |  |
Total revenues | [1] | $ 2,252 | $ 1,498 | $ 4,202 | $ 3,462
[1] | Includes service contract revenues of $375 and $311 and $674 and $627 recognized during the three and six months ended July 3, 2021 and June 27, 2020, respectively. Includes $111 recognized revenue related to the exclusive distribution rights during the three and six months ended July 3, 2021. Other also includes revenues from paid service, royalty, freight and legacy G probes.

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