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Geographic and Product Data (Details 1) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Oct. 02, 2015
Sep. 30, 2016
Oct. 02, 2015
Product Information [Line Items]        
Net sales $ 20,052 $ 18,750 $ 60,295 $ 56,264
ICLs [Member]        
Product Information [Line Items]        
Net sales 14,801 12,907 43,389 37,396
IOLs [Member]        
Product Information [Line Items]        
Net sales 4,649 4,390 14,783 14,952
Other surgical products [Member]        
Product Information [Line Items]        
Net sales $ 602 $ 1,453 $ 2,123 $ 3,916