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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Schedule of inventory [Abstract]                
Raw materials and work in progress $ 2,442       $ 2,490      
Finished goods 352       519      
Inventories, net $ 2,794 $ 2,488 $ 2,413 $ 3,029 $ 3,009 $ 3,533 $ 3,487 $ 2,670