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Inventories - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 43,406 $ 39,859
Finished goods 31,180 25,585
Inventories, net 74,586 65,444
Service and sales demonstration inventory, net $ 38,351 $ 39,563