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Balance Sheet Components (Schedule of Other Non-Current Assets) (Details) - USD ($)
$ in Thousands
Sep. 29, 2019
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]    
Non-current deferred income taxes $ 1,218 $ 1,108
Deposits 3,644 4,084
Other 748 3,257
Total other non-current assets $ 5,610 $ 8,449