Business Segments - Schedule of Revenue Information by Product (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 29, 2025	Mar. 30, 2024
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		$ 11,896	$ 11,761
Cyclo G6
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		3,181	2,953
Retina
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		6,645	6,774
Other
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues	[1]	$ 2,070	$ 2,034

[1] (1) Includes service contract revenues of $334 thousand and $328 thousand recognized during the three months ended March 29, 2025 and March 30, 2024, respectively. Includes $364 thousand recognized revenue related to the exclusive distribution rights during both of the three months ended March 29, 2025 and March 30, 2024. Other also includes revenues from paid service, royalty, freight and legacy G probes.