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Cash, Cash Equivalents, and Investments - Gross Unrealized Losses and Fair Values for Available-for-Sale Investments (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fair value, less than 12 months | $ 53,601,000 |  | $ 53,601,000 |
Unrealized losses, less than 12 months | (152,000) |  | (152,000) |
Fair value, 12 months or greater | 0 |  | 0 |
Unrealized losses, 12 months or greater | 0 |  | 0 |
Total fair value | 53,601,000 |  | 53,601,000 |
Total Unrealized Losses | (152,000) |  | (152,000) |
Gross credit losses recorded | 0 | $ 0 | 160,000 | $ 0
Gross recoveries | 0 | $ 0 | 85,000 | $ 0
Treasury Bills |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fair value, less than 12 months | 11,543,000 |  | 11,543,000 |
Unrealized losses, less than 12 months | (10,000) |  | (10,000) |
Fair value, 12 months or greater | 0 |  | 0 |
Unrealized losses, 12 months or greater | 0 |  | 0 |
Total fair value | 11,543,000 |  | 11,543,000 |
Total Unrealized Losses | (10,000) |  | (10,000) |
Corporate Bonds |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fair value, less than 12 months | 42,058,000 |  | 42,058,000 |
Unrealized losses, less than 12 months | (142,000) |  | (142,000) |
Fair value, 12 months or greater | 0 |  | 0 |
Unrealized losses, 12 months or greater | 0 |  | 0 |
Total fair value | 42,058,000 |  | 42,058,000 |
Total Unrealized Losses | $ (142,000) |  | $ (142,000) |

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