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Inventories, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventories, net [Abstract]    
Raw materials and purchased component parts $ 9,071 $ 7,724
Work-in-process 7 0
Finished goods 3,508 4,375
Inventories, net $ 12,586 $ 12,099