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Investments (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments Debt And Equity Securities [Abstract] |
Schedule of Available-for-sale Investments | Available-for-sale investments consisted of the following as of June 30, 2022 and December 31, 2021 (in thousands):
|  | June 30, 2022 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Estimated Fair Value |
Short-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 271,337 |  |  | $ | — |  |  | $ | (3,408 | ) |  | $ | 267,929 |
Corporate bonds |  |  | 39,662 |  |  |  | — |  |  |  | (265 | ) |  |  | 39,397 |
Total short-term marketable securities |  | $ | 310,999 |  |  | $ | — |  |  | $ | (3,673 | ) |  | $ | 307,326 |
Long-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 69,055 |  |  | $ | — |  |  | $ | (2,127 | ) |  | $ | 66,928 |
Total long-term marketable securities |  | $ | 69,055 |  |  | $ | — |  |  | $ | (2,127 | ) |  | $ | 66,928 |
|  | December 31, 2021 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Estimated Fair Value |
Short-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 186,752 |  |  | $ | 4 |  |  | $ | (109 | ) |  | $ | 186,647 |
Corporate bonds |  |  | 27,363 |  |  |  | — |  |  |  | (14 | ) |  |  | 27,349 |
Total short-term marketable securities |  | $ | 214,115 |  |  | $ | 4 |  |  | $ | (123 | ) |  | $ | 213,996 |
Long-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 205,472 |  |  | $ | — |  |  | $ | (974 | ) |  | $ | 204,498 |
Corporate bonds |  |  | 12,691 |  |  |  | — |  |  |  | (44 | ) |  |  | 12,647 |
Total long-term marketable securities |  | $ | 218,163 |  |  | $ | — |  |  | $ | (1,018 | ) |  | $ | 217,145 |
Schedule of Gross Unrealized Holding Losses and Fair Value for Investments in Unrealized Loss Position | The following table presents the gross unrealized holding losses and fair value for investments in an unrealized loss position, and the length of time individual securities have been in a continuous loss position, as of June 30, 2022 (in thousands):
|  | Less Than 12 Months |  |  | 12 Months Or Greater |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
U.S. government debt securities |  | $ | 334,857 |  |  | $ | (5,535 | ) |  | $ | — |  |  | $ | — |
Corporate bonds |  |  | 39,397 |  |  |  | (265 | ) |  |  | — |  |  |  | — |
Total available-for-sale securities |  | $ | 374,254 |  |  | $ | (5,800 | ) |  | $ | — |  |  | $ | — |

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