Disaggregation of Sales, Geographic Sales and Product Sales - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2022	Apr. 02, 2021
Product Information [Line Items]
Total other product sales	$ 4,525	$ 4,251
Total net sales	63,200	50,752
ICLs [Member]
Product Information [Line Items]
Revenue from contract with customer, excluding assessed tax	58,675	46,501
Cataract IOLs [Member]
Product Information [Line Items]
Total other product sales	2,902	3,725
Other surgical products [Member]
Product Information [Line Items]
Total other product sales	$ 1,623	$ 526