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Balance Sheet Components (Schedule of Intangibles, Net) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Intangible Assets [Line Items]    
Gross $ 126,944 $ 126,944
Accumulated Amortization (113,647) (109,798)
Net 13,297 17,146
Technology    
Intangible Assets [Line Items]    
Gross 59,799 59,799
Accumulated Amortization (57,192) (56,978)
Net 2,607 2,821
Customer contracts and relationships    
Intangible Assets [Line Items]    
Gross 56,800 56,800
Accumulated Amortization (47,615) (44,280)
Net 9,185 12,520
Other    
Intangible Assets [Line Items]    
Gross 10,345 10,345
Accumulated Amortization (8,840) (8,540)
Net $ 1,505 $ 1,805