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Fair Value Measurements, Cash Equivalents and Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2023
Fair Value Disclosures [Abstract] |
Estimated Fair Value of Our Cash Equivalents and Marketable Securities | The following tables summarize the estimated fair value of our cash equivalents, marketable securities and debt.
|  | As of March 31, 2023 |
(in thousands) |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 40,337 |  |  | $ | — |  |  | $ | — |  |  | $ | 40,337 |
U.S. treasury securities |  | $ | 64,272 |  |  | $ | — |  |  | $ | — |  |  | $ | 64,272 |
Corporate securities |  | $ | — |  |  | $ | 157,000 |  |  | $ | — |  |  | $ | 157,000 |
Total financial assets |  | $ | 104,609 |  |  | $ | 157,000 |  |  | $ | — |  |  | $ | 261,609 |
|  | As of December 31, 2022 |
(in thousands) |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 68,129 |  |  | $ | — |  |  | $ | — |  |  | $ | 68,129 |
U.S. treasury securities |  | $ | 72,577 |  |  | $ | — |  |  | $ | — |  |  | $ | 72,577 |
Corporate securities |  | $ | — |  |  | $ | 139,364 |  |  | $ | — |  |  | $ | 139,364 |
Total financial assets |  | $ | 140,706 |  |  | $ | 139,364 |  |  | $ | — |  |  | $ | 280,070 |
4. Fair value measurements, cash equivalents and marketable securities (continued) The following tables summarize the estimated fair value of our cash equivalents and marketable securities.
|  | As of March 31, 2023 |
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 40,337 |  |  | $ | — |  |  | $ | — |  |  | $ | 40,337 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 64,545 |  |  | $ | — |  |  | $ | (274 | ) |  | $ | 64,271 |
Corporate securities |  | $ | 157,209 |  |  | $ | — |  |  | $ | (209 | ) |  | $ | 157,000 |
|  | As of December 31, 2022 |
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 68,194 |  |  | $ | — |  |  | $ | (65 | ) |  | $ | 68,129 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 73,208 |  |  | $ | — |  |  | $ | (631 | ) |  | $ | 72,577 |
Corporate securities |  | $ | 139,932 |  |  | $ | — |  |  | $ | (568 | ) |  | $ | 139,364 |

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