Business Segments and Geographical Information - Schedule of Revenue Information by Product (Details) - USD ($) $ in Thousands		12 Months Ended
		Jan. 01, 2022	Jan. 02, 2021
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		$ 53,903	$ 36,347
Cyclo G6
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		13,950	11,272
Retina
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues		31,106	18,088
Other
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues	[1]	$ 8,847	$ 6,987

[1] Other includes service contract revenues of $1,386 and $1,263 recognized during fiscal years 2021 and 2020, respectively. Also includes $615 recognized revenue related to the exclusive distribution rights during fiscal year 2021. Other also includes revenues from paid service, royalty, freight and legacy G probes.