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Disaggregation of Sales, Geographic Sales and Product Sales - Net Sales by Products and Services (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 03, 2020
Jun. 28, 2019
Jul. 03, 2020
Jun. 28, 2019
Product Information [Line Items]        
Revenue from contract with customer, excluding assessed tax $ 4,466 $ 5,232 $ 10,313 $ 10,029
Total net sales 35,194 39,664 70,381 72,247
ICLs [Member]        
Product Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 30,728 34,432 60,068 62,218
IOLs [Member]        
Product Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 2,561 3,874 6,555 7,891
Other surgical products [Member]        
Product Information [Line Items]        
Revenue from contract with customer, excluding assessed tax $ 1,905 $ 1,358 $ 3,758 $ 2,138