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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of Marketable Securities | The following is a summary of marketable securities at June 30, 2024 and December 31, 2023 (in thousands):
|  | June 30, 2024 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Allowance for Credit Losses |  |  | Estimated Fair Values |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 11,154 |  |  | $ | — |  |  | $ | (17 | ) |  | $ | — |  |  | $ | 11,137 |
Corporate bonds and notes |  |  | 16,687 |  |  |  | 7 |  |  |  | (44 | ) |  |  | — |  |  |  | 16,650 |
Treasury and agency notes and bills |  |  | 3,481 |  |  |  | — |  |  |  | (2 | ) |  |  | — |  |  |  | 3,479 |
Total debt securities |  |  | 31,322 |  |  |  | 7 |  |  |  | (63 | ) |  |  | — |  |  |  | 31,266 |
Money market funds |  |  | 4,200 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,200 |
Total equity securities |  |  | 4,200 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,200 |
Total marketable securities |  | $ | 35,522 |  |  | $ | 7 |  |  | $ | (63 | ) |  | $ | — |  |  | $ | 35,466 |
Reported in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 7,469 |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 27,997 |
Total marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 35,466 |
|  | December 31, 2023 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Allowance for Credit Losses |  |  | Estimated Fair Values |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 12,421 |  |  | $ | 5 |  |  | $ | (4 | ) |  | $ | — |  |  | $ | 12,422 |
Treasury and agency notes and bills |  |  | 10,746 |  |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | 10,745 |
Corporate bonds and notes |  |  | 5,813 |  |  |  | 34 |  |  |  | (2 | ) |  |  | — |  |  |  | 5,845 |
Total debt securities |  |  | 28,980 |  |  |  | 39 |  |  |  | (7 | ) |  |  | — |  |  |  | 29,012 |
Money market funds |  |  | 5,778 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,778 |
Total equity securities |  |  | 5,778 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,778 |
Total marketable securities |  | $ | 34,758 |  |  | $ | 39 |  |  | $ | (7 | ) |  | $ | — |  |  | $ | 34,790 |
Reported in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 5,778 |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 29,012 |
Total marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 34,790 |
Estimated Fair Value of AFS Debt Securities by Contractual Maturity | The estimated fair value of AFS debt securities by contractual maturity at June 30, 2024 is shown below (in thousands). Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.
|  | Amortized Cost |  | Estimated Fair Value |
Due in one year or less |  | $ | 17,597 |  | $ | 17,571 |
Due in one to two years |  |  | 8,202 |  |  | 8,182 |
Due in two to three years |  |  | 5,523 |  |  | 5,513 |
Total |  | $ | 31,322 |  | $ | 31,266 |

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