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Balance Sheet Components (Schedule of Available-for-Sale Short-Term Investments) (Details) - U.S. treasuries - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 29, 2019 | Dec. 31, 2018
Debt Securities, Available-For-Sale [Line Items] |  |
Cost | $ 39,897 | $ 49,739
Unrealized Gains | 44 | 2
Unrealized Losses | 0 | (4)
Estimated Fair Value | $ 39,941 | $ 49,737

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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