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Fair Value Measurements - Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Cash and cash equivalents | $ 193,705 | $ 224,947
Common stock in LianBio | 46 | 631
Equity warrants (for LianBio shares) |  | 225
Total assets measured at fair value | 298,524 | 228,298
Money market funds |  |
Assets: |  |
Cash and cash equivalents | 186,744 | 224,947
U.S. Treasury securities |  |
Assets: |  |
Cash and cash equivalents | 3,484 |
Debt securities, available for sale and cash and cash equivalents | 31,812 |
Commercial paper |  |
Assets: |  |
Cash and cash equivalents | 3,477 |
Debt securities, available for sale and cash and cash equivalents | 30,828 |
Corporate debt securities |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 25,490 |
Government-related debt securities |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 23,604 | 2,495
Level 1 |  |
Assets: |  |
Common stock in LianBio | 46 | 631
Equity warrants (for LianBio shares) |  | 0
Total assets measured at fair value | 218,602 | 225,578
Level 1 | Money market funds |  |
Assets: |  |
Cash and cash equivalents | 186,744 | 224,947
Level 1 | U.S. Treasury securities |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 31,812 |
Level 1 | Commercial paper |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 0 |
Level 1 | Corporate debt securities |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 0 |
Level 1 | Government-related debt securities |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 0 | 0
Level 2 |  |
Assets: |  |
Common stock in LianBio | 0 | 0
Equity warrants (for LianBio shares) |  | 0
Total assets measured at fair value | 79,922 | 2,495
Level 2 | Money market funds |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Level 2 | U.S. Treasury securities |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 0 |
Level 2 | Commercial paper |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 30,828 |
Level 2 | Corporate debt securities |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 25,490 |
Level 2 | Government-related debt securities |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 23,604 | 2,495
Level 3 |  |
Assets: |  |
Common stock in LianBio | 0 | 0
Equity warrants (for LianBio shares) |  | 225
Total assets measured at fair value | 0 | 225
Level 3 | Money market funds |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Level 3 | U.S. Treasury securities |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 0 |
Level 3 | Commercial paper |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 0 |
Level 3 | Corporate debt securities |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | 0 |
Level 3 | Government-related debt securities |  |
Assets: |  |
Debt securities, available for sale and cash and cash equivalents | $ 0 | $ 0

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