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Investments Available for Sale (Tables) | 3 Months Ended
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Mar. 29, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of Investments Available for Sale and Related Fair Value Measurement | Investments available for sale (“AFS”) and the related fair value measurement consisted of the following (dollars in thousands):
|  | March 29, 2024 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Fair Value Measurements |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Level 1 |  |  | Level 2 |
Commercial paper |  | $ | 4,522 |  |  | $ | 3 |  |  | $ | (1 | ) |  | $ | 4,524 |  |  | $ | — |  |  | $ | 4,524 |
Certificates of deposit |  |  | 2,017 |  |  |  | 2 |  |  |  | — |  |  |  | 2,019 |  |  |  | — |  |  |  | 2,019 |
U.S. Treasury securities |  |  | 15,432 |  |  |  | — |  |  |  | (78 | ) |  |  | 15,354 |  |  |  | 15,354 |  |  |  | — |
U.S. agency securities |  |  | 1,732 |  |  |  | — |  |  |  | (3 | ) |  |  | 1,729 |  |  |  | — |  |  |  | 1,729 |
Corporate debt securities |  |  | 4,462 |  |  |  | 4 |  |  |  | (4 | ) |  |  | 4,462 |  |  |  | — |  |  |  | 4,462 |
Total investments AFS |  | $ | 28,165 |  |  | $ | 9 |  |  | $ | (86 | ) |  | $ | 28,088 |  |  | $ | 15,354 |  |  | $ | 12,734 |
|  | December 29, 2023 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Fair Value Measurements |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Level 1 |  |  | Level 2 |
Commercial paper |  | $ | 7,720 |  |  | $ | 9 |  |  | $ | — |  |  | $ | 7,729 |  |  | $ | — |  |  | $ | 7,729 |
Certificates of deposit |  |  | 3,716 |  |  |  | 4 |  |  |  | — |  |  |  | 3,720 |  |  |  | — |  |  |  | 3,720 |
U.S. Treasury securities |  |  | 23,036 |  |  |  | 3 |  |  |  | (56 | ) |  |  | 22,983 |  |  |  | 22,983 |  |  |  | — |
U.S. agency securities |  |  | 3,423 |  |  |  | — |  |  |  | (4 | ) |  |  | 3,419 |  |  |  | — |  |  |  | 3,419 |
Corporate debt securities |  |  | 11,538 |  |  |  | 12 |  |  |  | (10 | ) |  |  | 11,540 |  |  |  | — |  |  |  | 11,540 |
Total investments AFS |  | $ | 49,433 |  |  | $ | 28 |  |  | $ | (70 | ) |  | $ | 49,391 |  |  | $ | 22,983 |  |  | $ | 26,408 |
Summary of Fair Value of Investments Available for Sale by Contractual Maturity | The following table shows the fair value of investments AFS by contractual maturity (dollars in thousands):
|  | As of March 29, 2024 |
|  | Within one year |  |  | After one year through five years |  |  |  | Total |
Commercial paper |  | $ | 4,524 |  |  | $ | — |  |  |  | $ | 4,524 |
Certificates of deposit |  |  | 2,019 |  |  |  | — |  |  |  |  | 2,019 |
U.S. Treasury securities |  |  | 9,816 |  |  |  | 5,538 |  |  |  |  | 15,354 |
U.S. agency securities |  |  | 1,729 |  |  |  | — |  |  |  |  | 1,729 |
Corporate debt securities |  |  | 3,037 |  |  |  | 1,425 |  |  |  |  | 4,462 |
Total investments AFS |  | $ | 21,125 |  |  | $ | 6,963 |  |  |  | $ | 28,088 |

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