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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Components of inventories      
Raw materials $ 13,698   $ 13,347
Work in process 2,489   2,137
Finished goods 6,755   7,248
Inventories $ 22,942 $ 22,732 $ 22,732