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Inventories - Schedule of major classes of inventory (Details) - USD ($)
$ in Thousands
Mar. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials and packaging $ 16,385 $ 13,756
Work in process 6,198 2,517
Finished goods 11,698 13,984
Total $ 34,281 $ 30,257