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2. Inventories, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventories Net Details Abstract    
Finished goods $ 2,004 $ 2,825
Work in process 5,750 7,111
Raw materials 3,712 4,422
Total Inventory $ 11,466 $ 14,358