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Investments Available for Sale (Tables) | 9 Months Ended
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Sep. 29, 2023
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 29, 2023 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Fair Value Measurements |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Level 1 |  |  | Level 2 |
Commercial paper |  | $ | 17,102 |  |  | $ | 1 |  |  | $ | (5 | ) |  | $ | 17,098 |  |  | $ | — |  |  | $ | 17,098 |
Certificates of deposit |  |  | 4,080 |  |  |  | 1 |  |  |  | (2 | ) |  |  | 4,079 |  |  |  | — |  |  |  | 4,079 |
U.S. Treasury securities |  |  | 24,828 |  |  |  | — |  |  |  | (188 | ) |  |  | 24,640 |  |  |  | 24,640 |  |  |  | — |
U.S. agency securities |  |  | 9,771 |  |  |  | — |  |  |  | (21 | ) |  |  | 9,750 |  |  |  | — |  |  |  | 9,750 |
Corporate debt securities |  |  | 18,812 |  |  |  | 2 |  |  |  | (73 | ) |  |  | 18,741 |  |  |  | — |  |  |  | 18,741 |
Total investments AFS |  | $ | 74,593 |  |  | $ | 4 |  |  | $ | (289 | ) |  | $ | 74,308 |  |  | $ | 24,640 |  |  | $ | 49,668 |
|  | December 30, 2022 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Fair Value Measurements |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Level 1 |  |  | Level 2 |
Commercial paper |  | $ | 44,054 |  |  | $ | 11 |  |  | $ | (62 | ) |  | $ | 44,003 |  |  | $ | — |  |  | $ | 44,003 |
Certificates of deposit |  |  | 17,355 |  |  |  | 4 |  |  |  | (75 | ) |  |  | 17,284 |  |  |  | — |  |  |  | 17,284 |
U.S. Treasury securities |  |  | 21,847 |  |  |  | 3 |  |  |  | (15 | ) |  |  | 21,835 |  |  |  | 21,835 |  |  |  | — |
U.S. agency securities |  |  | 10,688 |  |  |  | 16 |  |  |  | (3 | ) |  |  | 10,701 |  |  |  | — |  |  |  | 10,701 |
Corporate debt securities |  |  | 45,522 |  |  |  | 4 |  |  |  | (288 | ) |  |  | 45,238 |  |  |  | — |  |  |  | 45,238 |
Total investments AFS |  | $ | 139,466 |  |  | $ | 38 |  |  | $ | (443 | ) |  | $ | 139,061 |  |  | $ | 21,835 |  |  | $ | 117,226 |
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 29, 2023 |
|  | Within one year |  |  | After one year through five years |  |  |  | Total |
Commercial paper |  | $ | 17,098 |  |  | $ | — |  |  |  | $ | 17,098 |
Certificates of deposit |  |  | 4,079 |  |  |  | — |  |  |  |  | 4,079 |
U.S. Treasury securities |  |  | 14,855 |  |  |  | 9,785 |  |  |  |  | 24,640 |
U.S. agency securities |  |  | 9,354 |  |  |  | 396 |  |  |  |  | 9,750 |
Corporate debt securities |  |  | 15,295 |  |  |  | 3,446 |  |  |  |  | 18,741 |
Total investments AFS |  | $ | 60,681 |  |  | $ | 13,627 |  |  |  | $ | 74,308 |

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