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Fair Value Measurements - Estimated Value of Cash, Cash Equivalents, Marketable Securities, and Equity Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Mar. 31, 2024
Cash equivalents: |  |
Amortized cost | $ 224,947 | $ 193,706
Cash and cash equivalents | 224,947 | 193,705
Marketable securities: |  |
Amortized cost | 2,496 | 105,945
Unrealized gains | 0 | 4
Unrealized losses | (1) | (1,130)
Corporate debt securities | 2,495 | 104,819
Long-term investments: |  |
Amortized cost | 1,108 |
Unrealized gains | 0 |
Unrealized losses | (477) |
Estimated fair value | 631 | 46
Cash Equivalents |  |
Marketable securities: |  |
Unrealized gains |  | 0
Unrealized losses |  | (1)
Money market funds |  |
Cash equivalents: |  |
Amortized cost | 224,947 | 186,744
Cash and cash equivalents | 224,947 | 186,744
U.S. Treasury securities |  |
Cash equivalents: |  |
Amortized cost |  | 3,484
Cash and cash equivalents |  | 3,484
Marketable securities: |  |
Amortized cost |  | 28,341
Unrealized gains |  | 0
Unrealized losses |  | (13)
Corporate debt securities |  | 28,328
Commercial paper |  |
Cash equivalents: |  |
Amortized cost |  | 3,478
Cash and cash equivalents |  | 3,477
Marketable securities: |  |
Amortized cost |  | 27,374
Unrealized gains |  | 0
Unrealized losses |  | (23)
Corporate debt securities |  | 27,351
Commercial paper | Cash Equivalents |  |
Marketable securities: |  |
Unrealized gains |  | 0
Unrealized losses |  | (1)
Corporate debt securities |  |
Marketable securities: |  |
Amortized cost |  | 25,509
Unrealized gains |  | 0
Unrealized losses |  | (19)
Corporate debt securities |  | 25,490
Government-related debt securities |  |
Marketable securities: |  |
Amortized cost | 2,496 | 23,613
Unrealized gains | 0 | 4
Unrealized losses | (1) | (13)
Corporate debt securities | $ 2,495 | 23,604
Common stock in LianBio |  |
Marketable securities: |  |
Amortized cost |  | 1,108
Unrealized gains |  | 0
Unrealized losses |  | (1,062)
Corporate debt securities |  | $ 46

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