Business Segments - Schedule of Revenue Information by Product (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 30, 2024	Apr. 01, 2023
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		$ 11,761	$ 13,706
Cyclo G6
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		2,953	3,669
Retina
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		6,774	7,214
Other
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues	[1]	$ 2,034	$ 2,823

[1] (1) Includes service contract revenues of $328 thousand and $383 thousand recognized during the three months ended March 30, 2024 and April 1, 2023, respectively. Includes $364 thousand recognized revenue related to the exclusive distribution rights during both of the three months ended March 30, 2024 and April 1, 2023. Other also includes revenues from paid service, royalty, freight and legacy G probes.