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COLLABORATION AND LICENSING AGREEMENTS - Recognized Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Total revenues | $ 74,114 | $ 46,023
Licensing revenue |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Total revenues | 5,020 | 17
Licensing revenue | Fosun Agreement | Fosun Pharma |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Total revenues | 5,000 | 0
Licensing revenue | Knight Agreement | Knight |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Total revenues | 20 | 17
Product supply revenue |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Total revenues | 254 | 2,126
Product supply revenue | 2017 KKC Agreement | Kyowa Kirin |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Total revenues | 0 | 2,126
Product supply revenue | Knight Agreement | Knight |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Total revenues | 254 | 0
Non-cash royalty revenue related to the sale of future royalties |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Total revenues | 1,026 | 368
Non-cash royalty revenue related to the sale of future royalties | 2017 KKC Agreement | Kyowa Kirin |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Total revenues | $ 1,026 | $ 368

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