Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 36,760	$ 28,190
Finished goods	15,126	17,381
Inventories, net	51,886	45,571
Service and sales demonstration inventory, net	$ 29,136	$ 33,709