Business Segments and Geographical Information - Schedule of Revenue Information by Product (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 30, 2023	Dec. 31, 2022
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		$ 51,869	$ 56,972
Cyclo G6
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		13,461	14,694
Retina
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		29,445	31,657
Other
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues	[1]	$ 8,963	$ 10,621

[1] (1) Includes service contract revenues of $1,534 thousand and $1,509 thousand recognized during fiscal years 2023 and 2022, respectively. Includes $1,455 thousand and $1,348 thousand recognized revenue related to the exclusive distribution rights during fiscal years 2023 and 2022. Other also includes revenues from paid service, royalty, freight and legacy G probes.