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Balance Sheet Components (Schedule of Amortized Cost and Estimated Fair Market Value of Investments Classified as Available-for-Sale Excluding Cash Equivalents) (Parentheticals) (Details) - USD ($)
Oct. 01, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]    
Short-term investments $ 96,586,000 $ 80,925,000
Other non-current assets 17,563,000 97,793,000
Convertible debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Short-term investments $ 173,000 173,000
Other non-current assets   $ 173,000