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2. Inventories (Details) - Inventory components - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory components [Abstract]    
Raw materials and purchased component parts $ 5,711 $ 6,627
Work-in-process 1 1
Finished goods 4,209 4,668
$ 9,921 $ 11,296