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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory, Net, Items Net of Reserve Alternative [Abstract]    
Finished goods $ 13,495 $ 8,320
Component parts 7,672 6,768
Service parts 4,825 4,238
Inventories-net 25,992 19,326
Inventory reserves $ 11,700 $ 9,600