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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Short-term marketable securities: |  |
Investment in equity securities | $ 17,707 |
Recurring |  |
Short-term marketable securities: |  |
Total short-term marketable securities | 419,264 | $ 251,011
Investment in equity securities | 17,707 |
LianBio Warrants | 2,878 | 3,338
Total financial assets | 509,493 | 520,786
Liability |  |
LEO call option liability |  | 5,550
Embedded derivative | 1,413 | 1,340
Total financial liabilities |  | 6,890
Recurring | Level 1 |  |
Short-term marketable securities: |  |
Investment in equity securities | 17,707 |
Total financial assets | 87,351 | 266,437
Recurring | Level 2 |  |
Short-term marketable securities: |  |
Total short-term marketable securities | 419,264 | 251,011
Total financial assets | 419,264 | 251,011
Recurring | Level 3 |  |
Short-term marketable securities: |  |
LianBio Warrants | 2,878 | 3,338
Total financial assets | 2,878 | 3,338
Liability |  |
LEO call option liability |  | 5,550
Embedded derivative | 1,413 | 1,340
Total financial liabilities |  | 6,890
Recurring | Money Market Funds |  |
Cash equivalents: |  |
Total cash equivalents | 69,644 | 266,437
Recurring | Money Market Funds | Level 1 |  |
Cash equivalents: |  |
Total cash equivalents | 69,644 | 266,437
Recurring | U.S. Treasury Bills |  |
Short-term marketable securities: |  |
Total short-term marketable securities |  | 14,999
Recurring | U.S. Treasury Bills | Level 2 |  |
Short-term marketable securities: |  |
Total short-term marketable securities |  | 14,999
Recurring | U.S. Treasury Notes |  |
Short-term marketable securities: |  |
Total short-term marketable securities | 60,555 | 45,391
Recurring | U.S. Treasury Notes | Level 2 |  |
Short-term marketable securities: |  |
Total short-term marketable securities | 60,555 | 45,391
Recurring | Commercial Paper |  |
Short-term marketable securities: |  |
Total short-term marketable securities | 184,277 | 144,851
Recurring | Commercial Paper | Level 2 |  |
Short-term marketable securities: |  |
Total short-term marketable securities | 184,277 | 144,851
Recurring | Corporate Debt Securities |  |
Short-term marketable securities: |  |
Total short-term marketable securities | 134,351 | 45,770
Recurring | Corporate Debt Securities | Level 2 |  |
Short-term marketable securities: |  |
Total short-term marketable securities | 134,351 | $ 45,770
Recurring | Supranational Debt Securities |  |
Short-term marketable securities: |  |
Total short-term marketable securities | 40,081 |
Recurring | Supranational Debt Securities | Level 2 |  |
Short-term marketable securities: |  |
Total short-term marketable securities | $ 40,081 |

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