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Other Balance Sheet Components - Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property and equipment, net:    
Property and equipment, gross $ 98,801 $ 101,515
Less: Accumulated depreciation (75,985) (78,665)
Property and equipment, net 22,816 22,850
Computers and equipment    
Property and equipment, net:    
Property and equipment, gross 94,170 93,947
Leasehold improvements    
Property and equipment, net:    
Property and equipment, gross 2,054 4,795
Furniture and fixtures    
Property and equipment, net:    
Property and equipment, gross 922 1,309
Others    
Property and equipment, net:    
Property and equipment, gross $ 1,655 $ 1,464