| Summary of marketable securities |
Marketable securities as of March 31, 2025 consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | Amortized
Cost | | Gross
Unrealized
Gains | | Gross
Unrealized
Losses | | Fair
Value | | Marketable securities, current: | | | | | | | | | Corporate debt securities | $ | 146,220 | | | $ | 114 | | | $ | (64) | | | $ | 146,270 | | | U.S. Treasury securities | 16,323 | | | 3 | | | (2) | | | 16,324 | | | U.S. government debt securities | 1,200 | | | — | | | — | | | 1,200 | | | Marketable securities, non-current: | | | | | | | | | Corporate debt securities | 15,623 | | | 11 | | | (17) | | | 15,617 | | | U.S. Treasury securities | 3,004 | | | — | | | (1) | | | 3,003 | | | U.S. government debt securities | 1,000 | | | — | | | (1) | | | 999 | | | Total marketable securities, current and non-current | $ | 183,370 | | | $ | 128 | | | $ | (85) | | | $ | 183,413 | |
Marketable securities as of December 31, 2024 consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | Amortized
Cost | | Gross
Unrealized
Gains | | Gross
Unrealized
Losses | | Fair
Value | | Marketable securities, current: | | | | | | | | | Corporate debt securities | $ | 164,469 | | | $ | 189 | | | $ | (85) | | | $ | 164,573 | | | U.S. government debt securities | 6,527 | | | 4 | | | — | | | 6,531 | | | U.S. Treasury securities | 18,291 | | | 12 | | | (1) | | | 18,302 | | | Marketable securities, non-current: | | | | | | | | | Corporate debt securities | 22,424 | | | 12 | | | (78) | | | 22,358 | | | | | | | | | | | | | | | | | | | Total marketable securities, current and non-current | $ | 211,711 | | | $ | 217 | | | $ | (164) | | | $ | 211,764 | |
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