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Balance Sheet Details - Summary of Equipment and Improvements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Gross, Total $ 21,005 $ 22,672
Less accumulated depreciation and amortization (19,194) (20,180)
Equipment and improvements, net 1,811 2,492
Computer Hardware, Software, and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Gross, Total 14,617 16,288
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Gross, Total 5,315 5,170
Office Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Gross, Total $ 1,073 $ 1,214