Inventories - Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 34,508	$ 28,190
Finished goods	20,698	17,381
Inventories, net	55,206	45,571
Service and demonstration inventory, net	$ 33,661	$ 33,709