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Investments (Tables) | 9 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Cost and Estimated Fair Value of Investments | The following table summarizes the amortized cost and estimated fair value of the Company's U.S. Treasury securities and U.S. government-sponsored enterprise securities, which are considered to be available-for-sale investments and were included in short-term investments as of September 30, 2023 and in short-term investments and long-term investments as of December 31, 2022 (in thousands):
|  | September 30, 2023 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury securities |  | $ | 32,957 |  |  | $ | 3 |  |  | $ | (47 | ) |  | $ | 32,913 |
U.S. government-sponsored enterprise securities |  |  | 79,576 |  |  |  | — |  |  |  | (258 | ) |  |  | 79,318 |
|  | $ | 112,533 |  |  | $ | 3 |  |  | $ | (305 | ) |  | $ | 112,231 |
|  | December 31, 2022 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 32,174 |  |  | $ | 3 |  |  | $ | (34 | ) |  | $ | 32,143 |
U.S. government-sponsored enterprise securities |  |  | 66,106 |  |  |  | 68 |  |  |  | (85 | ) |  |  | 66,089 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 7,242 |  |  |  | — |  |  |  | (4 | ) |  |  | 7,238 |
U.S. government-sponsored enterprise securities |  |  | 34,686 |  |  |  | — |  |  |  | (43 | ) |  |  | 34,643 |
|  | $ | 140,208 |  |  | $ | 71 |  |  | $ | (166 | ) |  | $ | 140,113 |

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- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
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