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Fair Value Measurements - Fair value to amortized cost (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value Measurements |  |
AMORTIZED COST | $ 790,728 | $ 874,422
UNREALIZED LOSSES | (121) | (427)
UNREALIZED GAINS | 946 | 1,341
FAIR VALUE | 791,553 | 875,336
Money market funds |  |
Fair Value Measurements |  |
AMORTIZED COST | 85,462 | 161,328
FAIR VALUE | 85,462 | 161,328
U.S. government bonds |  |
Fair Value Measurements |  |
AMORTIZED COST | 383,648 | 262,316
UNREALIZED LOSSES | (30) | (48)
UNREALIZED GAINS | 666 | 747
FAIR VALUE | 384,284 | 263,015
U.S. government agency bonds |  |
Fair Value Measurements |  |
AMORTIZED COST | 44,706 | 46,890
UNREALIZED LOSSES | (1) | (11)
UNREALIZED GAINS | 26 | 78
FAIR VALUE | 44,731 | 46,957
Corporate debt securities |  |
Fair Value Measurements |  |
AMORTIZED COST | 276,912 | 403,888
UNREALIZED LOSSES | (90) | (368)
UNREALIZED GAINS | 254 | 516
FAIR VALUE | $ 277,076 | $ 404,036

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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/2003/role/disclosureRef -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 + Details
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