Balance Sheet Components (Schedule of Intangibles, Net) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets [Line Items]
Gross	$ 126,944	$ 126,944
Accumulated Amortization	(123,045)	(116,840)
Net	3,899	10,104
Technology
Intangible Assets [Line Items]
Gross	59,799	59,799
Accumulated Amortization	(57,835)	(57,406)
Net	1,964	2,393
Customer contracts and relationships
Intangible Assets [Line Items]
Gross	56,800	56,800
Accumulated Amortization	(55,534)	(50,297)
Net	1,266	6,503
Other
Intangible Assets [Line Items]
Gross	10,345	10,345
Accumulated Amortization	(9,676)	(9,137)
Net	$ 669	$ 1,208