| Investment Securities |
5. Investment Securities The following represents the Company’s investment securities for the years ended December 31, 2025 and 2024: | | | | | | | | | | | | | Balance at December 31, 2025 | | | Acquisition
Cost | | | Accretion /
(Amortization) | | | Unrealized
Gain / (Loss) | | | Estimated
Fair Value | Commercial paper | | $ | 4,888 | | $ | 34 | | $ | — | | $ | 4,922 | Corporate notes / bonds | | | 24,063 | | | 96 | | | 2 | | | 24,161 | Money market funds | | | 5,287 | | | — | | | — | | | 5,287 | U.S. govt. agencies | | | 11,192 | | | 64 | | | 5 | | | 11,261 | U.S. treasuries | | | 4,881 | | | 11 | | | (1) | | | 4,891 | Total investment securities | | $ | 50,311 | | $ | 205 | | $ | 6 | | $ | 50,522 |
| | | | | | | | | | | | | Balance at December 31, 2024 | | | Acquisition
Cost | | | Accretion /
(Amortization) | | | Unrealized
Gain / (Loss) | | | Estimated
Fair Value | Commercial paper | | $ | 10,130 | | $ | 254 | | $ | 3 | | $ | 10,387 | Corporate notes / bonds | | | 45,336 | | | 483 | | | 7 | | | 45,826 | Money market funds | | | 2,766 | | | — | | | — | | | 2,766 | U.S. govt. agencies | | | 1,441 | | | 31 | | | (2) | | | 1,470 | U.S. treasuries | | | 6,609 | | | 41 | | | (1) | | | 6,649 | Total investment securities | | $ | 66,282 | | $ | 809 | | $ | 7 | | $ | 67,098 |
Accretion / (amortization) refers to the discounts and premiums incurred on bonds and notes purchased and are included within interest income on our consolidated income statement. Accrued interest receivable, related to the above investment securities, amounted to $314 and $504 for the years ended December 31, 2025 and 2024 and are included within Other Receivables on our consolidated balance sheets. Contractual maturities of investment securities as of December 31, 2025 are as follows: | | | | | | | | | | Acquisition
Cost | | | Estimated
Fair Value | Original maturities of 90 days or less | | $ | 6,282 | | $ | 6,283 | Original maturities of 91-365 days | | | 44,029 | | | 44,239 | Original maturities of 366+ days | | | - | | | - | Total investment securities | | $ | 50,311 | | $ | 50,522 |
|