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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Debt Securities, Available-for-Sale | The following table summarizes information regarding the Company’s short-term and long-term marketable securities as of September 30, 2023 and December 31, 2022:
| September 30, 2023
(in thousands) | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
U.S. municipal securities | $ | 8,629 |  |  | $ | - |  |  | $ | (209) |  |  | $ | 8,420 |
Corporate debt securities | 2,530 |  |  | - |  |  | (54) |  |  | 2,476 |
U.S. government agency securities | 20,793 |  |  | - |  |  | (520) |  |  | 20,273 |
Certificates of deposit/time deposits | 249 |  |  | - |  |  | (2) |  |  | 247 |
Total marketable securities | $ | 32,201 |  |  | $ | - |  |  | $ | (785) |  |  | $ | 31,416 |
| December 31, 2022
(in thousands) | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
U.S. municipal securities | $ | 15,574 |  |  | $ | - |  |  | $ | (417) |  |  | $ | 15,157 |
Corporate debt securities | 9,578 |  |  | - |  |  | (205) |  |  | 9,373 |
U.S. government agency securities | 25,275 |  |  | - |  |  | (750) |  |  | 24,525 |
Certificates of deposit/time deposits | 939 |  |  | - |  |  | (7) |  |  | 932 |
Total marketable securities | $ | 51,366 |  |  | $ | - |  |  | $ | (1,379) |  |  | $ | 49,987 |
Investments Classified by Contractual Maturity Date | The September 30, 2023 balance of available-for-sale debt securities by contractual maturity is shown in the following table at fair value. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
(in thousands) | September 30, 2023
Due in one year or less | $ | 19,204 |
Due after one year through five years | 12,212 |
Total marketable securities | $ | 31,416 |

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