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Investments Available for Sale (Tables) | 9 Months Ended
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Sep. 27, 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):
|  | September 27, 2024 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Fair Value Measurements |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Level 1 |  |  | Level 2 |
Commercial paper |  | $ | 10,582 |  |  | $ | 10 |  |  | $ | (1 | ) |  | $ | 10,591 |  |  | $ | — |  |  | $ | 10,591 |
Certificates of deposit |  |  | 253 |  |  |  | 1 |  |  |  | — |  |  |  | 254 |  |  |  | — |  |  |  | 254 |
U.S. Treasury securities |  |  | 10,089 |  |  |  | 4 |  |  |  | (6 | ) |  |  | 10,087 |  |  |  | 10,087 |  |  |  | — |
U.S. agency securities |  |  | 405 |  |  |  | — |  |  |  | — |  |  |  | 405 |  |  |  | — |  |  |  | 405 |
Corporate debt securities |  |  | 50,566 |  |  |  | 57 |  |  |  | (5 | ) |  |  | 50,618 |  |  |  | — |  |  |  | 50,618 |
Total investments AFS |  | $ | 71,895 |  |  | $ | 72 |  |  | $ | (12 | ) |  | $ | 71,955 |  |  | $ | 10,087 |  |  | $ | 61,868 |
|  | 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 September 27, 2024 |
|  | Within one year |  |  | After one year through five years |  |  |  | Total |
Commercial paper |  | $ | 10,591 |  |  | $ | — |  |  |  | $ | 10,591 |
Certificates of deposit |  |  | 254 |  |  |  | — |  |  |  |  | 254 |
U.S. Treasury securities |  |  | 10,087 |  |  |  | — |  |  |  |  | 10,087 |
U.S. agency securities |  |  | 405 |  |  |  | — |  |  |  |  | 405 |
Corporate debt securities |  |  | 50,618 |  |  |  | — |  |  |  |  | 50,618 |
Total investments AFS |  | $ | 71,955 |  |  | $ | — |  |  |  | $ | 71,955 |

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