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Balance Sheet Components (Schedule of Changes in Carrying Value of Long-term Investments) (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 03, 2021
Sep. 27, 2020
Balance Sheet Related Disclosures [Abstract]    
Beginning Balance [1] $ 7,758 $ 8,147
Additions from purchase of investments 340 5,850
Disposal (778) 0
Impairment (549) (5,372)
Ending Balance [1] $ 6,771 $ 8,625
[1] The balances excluded an investment in limited partnership funds of $0.8 million, $0.4 million and $0.6 million as of October 3, 2021, September 27, 2020 and December 31, 2020, respectively. Additionally, the balance as of October 3, 2021 excluded an investment in convertible debt securities of $0.3 million.