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Investments Available for Sale (Tables) | 3 Months Ended
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Mar. 31, 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):
|  | March 31, 2023 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Fair Value Measurements |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Level 1 |  |  | Level 2 |
Commercial paper |  | $ | 34,464 |  |  | $ | 4 |  |  | $ | (28 | ) |  | $ | 34,440 |  |  | $ | — |  |  | $ | 34,440 |
Certificates of deposit |  |  | 18,414 |  |  |  | 3 |  |  |  | (42 | ) |  |  | 18,375 |  |  |  | — |  |  |  | 18,375 |
U.S. Treasury securities |  |  | 24,430 |  |  |  | 26 |  |  |  | (9 | ) |  |  | 24,447 |  |  |  | 24,447 |  |  |  | — |
U.S. agency securities |  |  | 10,965 |  |  |  | 15 |  |  |  | (2 | ) |  |  | 10,978 |  |  |  | — |  |  |  | 10,978 |
Corporate debt securities |  |  | 39,342 |  |  |  | 3 |  |  |  | (261 | ) |  |  | 39,084 |  |  |  | — |  |  |  | 39,084 |
Total investments AFS |  | $ | 127,615 |  |  | $ | 51 |  |  | $ | (342 | ) |  | $ | 127,324 |  |  | $ | 24,447 |  |  | $ | 102,877 |
|  | 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 March 31, 2023 |
|  | Within one year |  |  | After one year through five years |  |  |  | Total |
Commercial paper |  | $ | 34,440 |  |  | $ | — |  |  |  | $ | 34,440 |
Certificates of deposit |  |  | 18,375 |  |  |  | — |  |  |  |  | 18,375 |
U.S. Treasury securities |  |  | 16,331 |  |  |  | 8,116 |  |  |  |  | 24,447 |
U.S. agency securities |  |  | 9,256 |  |  |  | 1,722 |  |  |  |  | 10,978 |
Corporate debt securities |  |  | 35,477 |  |  |  | 3,607 |  |  |  |  | 39,084 |
Total investments AFS |  | $ | 113,879 |  |  | $ | 13,445 |  |  |  | $ | 127,324 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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