Details of Selected Balance Sheet Accounts - Inventories (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials and subassemblies	$ 38,195	$ 41,461
Work-in-process	10,405	18,221
Finished goods	12,294	21,284
Reserve for excess and obsolete inventories	(24,947)	(29,804)
Total	35,947	$ 51,162
Inventory adjustments	$ (4,900)