Balance Sheet Components (Schedule of Intangibles, Net) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Intangible Assets [Line Items]
Gross	$ 126,944	$ 126,944
Accumulated Amortization	(125,088)	(123,045)
Net	1,856	3,899
Technology
Intangible Assets [Line Items]
Gross	59,799	59,799
Accumulated Amortization	(58,263)	(57,835)
Net	1,536	1,964
Customer contracts and relationships
Intangible Assets [Line Items]
Gross	56,800	56,800
Accumulated Amortization	(56,800)	(55,534)
Net	0	1,266
Other
Intangible Assets [Line Items]
Gross	10,345	10,345
Accumulated Amortization	(10,025)	(9,676)
Net	$ 320	$ 669