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Short-term Investments - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 267,716 | $ 447,827
Unrealized Gain | 1,032 | 47
Unrealized Loss | (24) | (7,016)
Estimated Fair Value | 268,724 | 440,858
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 239,297 | 384,951
Unrealized Gain | 970 | 0
Unrealized Loss | (11) | (6,949)
Estimated Fair Value | 240,256 | 378,002
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 15,000 | 29,012
Unrealized Gain | 0 | 47
Unrealized Loss | (7) | 0
Estimated Fair Value | 14,993 | 29,059
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 28,815
Unrealized Gain |  | 0
Unrealized Loss |  | 0
Estimated Fair Value |  | 28,815
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,438 |
Unrealized Gain | 62 |
Unrealized Loss | 0 |
Estimated Fair Value | 10,500 |
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,981 | 5,049
Unrealized Gain | 0 | 0
Unrealized Loss | (6) | (67)
Estimated Fair Value | $ 2,975 | $ 4,982

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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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