Inventories - Schedule of Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 44,489	$ 36,760
Finished goods	13,377	15,126
Inventories, net	57,866	51,886
Service and sales demonstration inventory, net	$ 35,259	$ 29,136