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Disaggregation of Revenues, Geographic Sales and Product Sales (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Jun. 29, 2018
Jun. 30, 2017
Product Information [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax $ 6,613 $ 5,619 $ 12,548 $ 10,698
Net sales 33,905 21,936 60,998 42,286
ICLs [Member]        
Product Information [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 27,292 16,317 48,450 31,588
IOLs [Member]        
Product Information [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 4,186 4,377 8,244 8,983
Other surgical products [Member]        
Product Information [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax $ 2,427 $ 1,242 $ 4,304 $ 1,715