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Investments Available for Sale (Tables) | 6 Months Ended
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Jun. 30, 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):
|  | June 30, 2023 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Fair Value Measurements |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Level 1 |  |  | Level 2 |
Commercial paper |  | $ | 28,519 |  |  | $ | — |  |  | $ | (19 | ) |  | $ | 28,500 |  |  | $ | — |  |  | $ | 28,500 |
Certificates of deposit |  |  | 10,774 |  |  |  | 1 |  |  |  | (13 | ) |  |  | 10,762 |  |  |  | — |  |  |  | 10,762 |
U.S. Treasury securities |  |  | 30,318 |  |  |  | — |  |  |  | (203 | ) |  |  | 30,115 |  |  |  | 30,115 |  |  |  | — |
U.S. agency securities |  |  | 11,034 |  |  |  | — |  |  |  | (32 | ) |  |  | 11,002 |  |  |  | — |  |  |  | 11,002 |
Corporate debt securities |  |  | 34,625 |  |  |  | 3 |  |  |  | (170 | ) |  |  | 34,458 |  |  |  | — |  |  |  | 34,458 |
Total investments AFS |  | $ | 115,270 |  |  | $ | 4 |  |  | $ | (437 | ) |  | $ | 114,837 |  |  | $ | 30,115 |  |  | $ | 84,722 |
|  | 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 June 30, 2023 |
|  | Within one year |  |  | After one year through five years |  |  |  | Total |
Commercial paper |  | $ | 28,500 |  |  | $ | — |  |  |  | $ | 28,500 |
Certificates of deposit |  |  | 10,762 |  |  |  | — |  |  |  |  | 10,762 |
U.S. Treasury securities |  |  | 16,613 |  |  |  | 13,502 |  |  |  |  | 30,115 |
U.S. agency securities |  |  | 10,030 |  |  |  | 972 |  |  |  |  | 11,002 |
Corporate debt securities |  |  | 31,407 |  |  |  | 3,051 |  |  |  |  | 34,458 |
Total investments AFS |  | $ | 97,312 |  |  | $ | 17,525 |  |  |  | $ | 114,837 |

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