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Balance Sheet Components (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 29, 2020
Mar. 31, 2019
Balance Sheet Related Disclosures [Abstract]    
Provisions for excess and obsolete inventory $ 2,403 $ 945
Amortization expense 1,600 $ 2,100
Impairment charge 4,530  
Equity securities without readily determinable fair value, cumulative downward adjustments for price change and impairment loss 6,200  
Cumulative upward adjustments for price changes $ 200