The following table summarizes the Company’s investments as of September 30, 2022 (in thousands): | | | | | | | | | | | | | | | | | | Gross | | | | | | Amortized | | Unrealized | | Estimated | | | Cost | | Gains | | Losses | | Fair Value | Marketable securities available-for-sale: | | | | | | | | | | | | | U.S. Treasury obligations | | $ | 211,516 | | | — | | | (936) | | $ | 210,580 | Total available-for-sale securities | | $ | 211,516 | | $ | — | | $ | (936) | | $ | 210,580 |
The following table summarizes the Company’s investments as of December 31, 2021 (in thousands): | | | | | | | | | | | | | | | | | | Gross | | | | | | Amortized | | Unrealized | | Estimated | | | Cost | | Gains | | Losses | | Fair Value | Marketable securities available-for-sale: | | | | | | | | | | | | | U.S. Treasury obligations | | $ | 40,194 | | $ | — | | $ | (35) | | $ | 40,159 | Total available-for-sale securities | | $ | 40,194 | | $ | — | | $ | (35) | | $ | 40,159 |
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