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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Summary of Financial Assets Measured at Fair Value on a Recurring Basis | The following tables summarize the Company’s financial assets measured at fair value on a recurring basis by level within the fair value hierarchy:
|  | December 31, 2023 |
|  | Fair Value Hierarchy |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Market Value |
|  | (In thousands) |
Money market funds |  | Level 1 |  | $ | 67,101 |  |  | $ | — |  |  | $ | — |  |  | $ | 67,101 |
U.S. government treasury securities |  | Level 1 |  |  | 178,232 |  |  |  | 86 |  |  |  | (112 | ) |  |  | 178,206 |
Certificates of deposit |  | Level 2 |  |  | 29,086 |  |  |  | 63 |  |  |  | — |  |  |  | 29,149 |
Commercial paper |  | Level 2 |  |  | 140,082 |  |  |  | 85 |  |  |  | (34 | ) |  |  | 140,133 |
Corporate bonds |  | Level 2 |  |  | 129,474 |  |  |  | 173 |  |  |  | (78 | ) |  |  | 129,569 |
Total cash equivalents and marketable securities |  |  |  | $ | 543,975 |  |  | $ | 407 |  |  | $ | (224 | ) |  | $ | 544,158 |
|  | December 31, 2022 |
|  | Fair Value Hierarchy |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Market Value |
|  | (In thousands) |
Money market funds |  | Level 1 |  | $ | 74,848 |  |  | $ | — |  |  | $ | — |  |  | $ | 74,848 |
U.S. government treasury securities |  | Level 1 |  |  | 506,372 |  |  |  | 7 |  |  |  | (4,569 | ) |  |  | 501,810 |
Commercial paper |  | Level 2 |  |  | 44,438 |  |  |  | 2 |  |  |  | (8 | ) |  |  | 44,432 |
Corporate bonds |  | Level 2 |  |  | 29,352 |  |  |  | 4 |  |  |  | (10 | ) |  |  | 29,346 |
Total cash equivalents and marketable securities |  |  |  | $ | 655,010 |  |  | $ | 13 |  |  | $ | (4,587 | ) |  | $ | 650,436 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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