Inventories - Schedule of Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 39,160	$ 36,760
Finished goods	13,377	15,126
Inventories, net	52,537	51,886
Service and sales demonstration inventory, net	$ 31,935	$ 29,136