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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2023
Investments, All Other Investments [Abstract] |
Schedule of Fair Value and Amortized Cost | The fair value and amortized cost of cash equivalents and available-for-sale securities by major security type as of September 30, 2023 and as of December 31, 2022 are presented in the following tables:
| September 30, 2023
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In thousands)
Money market funds | $ | 50,937 |  |  | $ | — |  |  | $ | — |  |  | $ | 50,937 |
Corporate bonds | 86,734 |  |  | 3 |  |  | (558) |  |  | 86,179 |
U.S. treasury securities | 311,637 |  |  | — |  |  | (680) |  |  | 310,957 |
U.S. agency securities | 41,998 |  |  | — |  |  | (732) |  |  | 41,266 |
Total cash equivalents and investments | $ | 491,306 |  |  | $ | 3 |  |  | $ | (1,970) |  |  | $ | 489,339 |
Classified as: |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  | $ | 60,910 |
Short-term investments |  |  |  |  |  |  | 396,259 |
Long-term investments |  |  |  |  |  |  | 32,170 |
Total cash equivalents and investments |  |  |  |  |  |  | $ | 489,339 |
| December 31, 2022
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In thousands)
Money market funds | $ | 10,679 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,679 |
Commercial paper | 4,956 |  |  | — |  |  | (2) |  |  | 4,954 |
Corporate bonds | 156,019 |  |  | 25 |  |  | (2,788) |  |  | 153,256 |
U.S. treasury securities | 323,077 |  |  | 5 |  |  | (5,060) |  |  | 318,022 |
U.S. agency securities | 41,078 |  |  | — |  |  | (1,662) |  |  | 39,416 |
Total cash equivalents and investments | $ | 535,809 |  |  | $ | 30 |  |  | $ | (9,512) |  |  | $ | 526,327 |
Classified as: |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  | $ | 11,760 |
Short-term investments |  |  |  |  |  |  | 455,416 |
Long-term investments |  |  |  |  |  |  | 59,151 |
Total cash equivalents and investments |  |  |  |  |  |  | $ | 526,327 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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