Inventories - Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 39,285	$ 36,760
Finished goods	19,759	15,126
Inventories, net	59,044	51,886
Service and sales demonstration inventory, net	$ 35,250	$ 29,136