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Fair Value Measurements (Summary of Valuation of Company's Financial Instruments by Various Levels) (Details) - USD ($) $ in Thousands | Sep. 29, 2024 | Dec. 31, 2023
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value |  | $ 233,069 | $ 133,208
Liabilities measured at fair value |  | 1,267 | 1,691
Quoted market prices in active markets (Level 1) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 113,730 | 34,290
Liabilities measured at fair value |  | 0 | 0
Significant other observable inputs (Level 2) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 119,339 | 98,918
Liabilities measured at fair value |  | 1,267 | 1,691
Cash Equivalents |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 110,859 | 25,986
Cash Equivalents | Quoted market prices in active markets (Level 1) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 110,859 | 25,986
Cash Equivalents | Significant other observable inputs (Level 2) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 0 | 0
Trading securities |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 2,871 | 8,304
Trading securities | Quoted market prices in active markets (Level 1) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 2,871 | 8,304
Trading securities | Significant other observable inputs (Level 2) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 0 | 0
Available-for-sale Investments | U.S. Treasury Securities |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 119,094 | 98,454
Available-for-sale Investments | U.S. Treasury Securities | Quoted market prices in active markets (Level 1) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 0 | 0
Available-for-sale Investments | U.S. Treasury Securities | Significant other observable inputs (Level 2) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 119,094 | 98,454
Available For Sale Investments Convertible Debt Securities |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] |  | 173
Available For Sale Investments Convertible Debt Securities | Quoted market prices in active markets (Level 1) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] |  | 0
Available For Sale Investments Convertible Debt Securities | Significant other observable inputs (Level 2) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] |  | 173
Foreign currency forward contracts |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [2] | 245 | 291
Liabilities measured at fair value | [3] | 1,267 | 1,691
Foreign currency forward contracts | Quoted market prices in active markets (Level 1) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [2] | 0 | 0
Liabilities measured at fair value | [3] | 0 | 0
Foreign currency forward contracts | Significant other observable inputs (Level 2) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value | [2] | 245 | 291
Liabilities measured at fair value | [3] | $ 1,267 | $ 1,691
[1] | Included in Short-term investments on the Company’s unaudited condensed consolidated balance sheets.
[2] | Included in Prepaid expenses and other current assets on the Company’s unaudited condensed consolidated balance sheets.
[3] | Included in Other accrued liabilities on the Company's unaudited condensed consolidated balance sheets.

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