| Summary of Cash, Cash Equivalents, Restricted Cash and Investments |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2024 | | (in thousands) | | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Estimated Fair Value | | Cash, cash equivalents and restricted cash | | $ | 64,459 | | | $ | — | | | $ | — | | | $ | 64,459 | | | | | | | | | | | | Corporate bonds | | 23,547 | | | — | | | (3) | | | 23,544 | | | Commercial paper | | 38,273 | | | — | | | (30) | | | 38,243 | | | Treasury bills | | 134,984 | | | — | | | (9) | | | 134,975 | | | Treasury bonds | | 58,697 | | | — | | | (7) | | | 58,690 | | | | | | | | | | | | Total cash, cash equivalents, restricted cash and short-term investments | | 319,960 | | | — | | | (49) | | | 319,911 | | | Total long-term investment corporate bond | | 199 | | | 1 | | | — | | | 200 | | | Total cash, cash equivalents, restricted cash and investments | | $ | 320,159 | | | $ | 1 | | | $ | (49) | | | $ | 320,111 | | | | | | | | | | | | | December 31, 2023 | | (in thousands) | | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Estimated Fair Value | | Cash, cash equivalents and restricted cash | | $ | 48,875 | | | $ | — | | | $ | — | | | $ | 48,875 | | | | | | | | | | | | Corporate bonds | | 33,576 | | | 4 | | | — | | | 33,580 | | | Commercial paper | | 39,305 | | | — | | | (1) | | | 39,304 | | | Treasury bills | | 122,757 | | | 49 | | | — | | | 122,806 | | | Treasury bonds | | 105,903 | | | 21 | | | — | | | 105,924 | | | | | | | | | | | | Total cash, cash equivalents, restricted cash and short-term investments | | 350,416 | | | 74 | | | (1) | | | 350,489 | | Total long-term investment corporate bond | | 200 | | | 1 | | | — | | | 201 | | Total cash, cash equivalents, restricted cash and investments | | $ | 350,616 | | | $ | 75 | | | $ | (1) | | | $ | 350,690 | |
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