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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Jan. 01, 2021
--- | --- | ---
Debt securities available-for-sale: |  |
Amortized Cost | $ 1,534,464 | $ 1,349,982
Gross Unrealized Gains | 934 | 5,931
Gross Unrealized Losses | (1,730) | (12)
Fair Value | 1,533,668 | 1,355,901
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  |
Amortized Cost | 1,855,704 | 1,532,923
Gross Unrealized Gains | 934 | 5,931
Gross Unrealized Losses | (1,730) | (12)
Fair Value | 1,854,908 | 1,538,842
Commercial paper |  |
Debt securities available-for-sale: |  |
Amortized Cost | 945,801 | 569,456
Gross Unrealized Gains | 42 | 372
Gross Unrealized Losses | (2) | 0
Fair Value | 945,841 | 569,828
Corporate bonds |  |
Debt securities available-for-sale: |  |
Amortized Cost | 541,774 | 543,520
Gross Unrealized Gains | 876 | 5,244
Gross Unrealized Losses | (1,672) | (7)
Fair Value | 540,978 | 548,757
U.S. Treasury and government-sponsored enterprises |  |
Debt securities available-for-sale: |  |
Amortized Cost | 33,965 | 208,326
Gross Unrealized Gains | 1 | 232
Gross Unrealized Losses | (21) | (4)
Fair Value | 33,945 | 208,554
Municipal bonds |  |
Debt securities available-for-sale: |  |
Amortized Cost | 12,924 | 28,680
Gross Unrealized Gains | 15 | 83
Gross Unrealized Losses | (35) | (1)
Fair Value | 12,904 | 28,762
Cash |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  |
Amortized Cost | 135,653 | 82,176
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 135,653 | 82,176
Money market funds |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  |
Amortized Cost | 66,531 | 40,761
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 66,531 | 40,761
Certificates of deposit |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  |
Amortized Cost | 119,056 | 60,004
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 119,056 | $ 60,004

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