Marketable securities by security type consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | | June 30, 2026 | | | | Amortized
Cost | | Gross
Unrealized
Gain | | Gross
Unrealized
Loss | | Credit Losses | | Fair Value | | Marketable securities - U.S. Treasury securities | | $ | 33,560 | | $ | | | $ | (32) | | $ | — | | $ | 33,528 | | Marketable securities - Agency bond | | | 4,993 | | | — | | | (9) | | | — | | | 4,984 | | | | $ | 38,553 | | $ | — | | $ | (41) | | $ | — | | $ | 38,512 | |
| | | | | | | | | | | | | | | | | | | December 31, 2025 | | | | Amortized
Cost | | Gross
Unrealized
Gain | | Gross
Unrealized
Loss | | Credit Losses | | Fair Value | | Marketable securities - U.S. Treasury securities | | $ | 42,399 | | $ | 54 | | $ | — | | $ | — | | $ | 42,453 | |
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