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Balance Sheet Components (Schedule of Changes in Carrying Value of Long-term Investments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
Beginning Balance $ 7,758 [1] $ 8,147
Additions 340 5,850
Disposals (1,499)  
Impairment and downward adjustments for observable price changes (549) (6,239)
Upward adjustments for observable price changes 253  
Ending Balance [1] $ 6,303 $ 7,758
[1] The balances excluded the investment in limited partnership fund of $0.9 million and $0.6 million, as of December 31, 2021 and 2020, respectively. Additionally, the balance as of December 31, 2021 excluded an investment in convertible debt securities of $0.3 million.