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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 02, 2018
Dec. 31, 2017
Inventories      
Raw materials $ 8,235   $ 7,411
Work-in-process     5,107
Finished goods 2,991   2,974
Inventory reserve (1,399)   (1,693)
Inventory $ 9,827 $ 7,870 $ 13,799