Details of Selected Balance Sheet Accounts - Inventories (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials and subassemblies	$ 36,530	$ 41,461
Work-in-process	6,467	18,221
Finished goods	16,213	21,284
Reserve for excess and obsolete inventories	(24,527)	(29,804)
Total	34,683	$ 51,162
Inventory adjustments	$ (5,300)