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COLLABORATION AND LICENSING AGREEMENTS - Recognized Revenue (Details) $ in Thousands, ¥ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 JPY (¥)	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	$ 110,329			$ 98,241	$ 282,105	$ 217,486
Licensing revenue
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	25			20	5,065	56
Licensing revenue | Fosun Agreement | Fosun Pharma
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	0		$ 5,000	0	5,000	0
Licensing revenue | Knight Agreement | Knight
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	25			20	65	56
Product supply revenue
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	0			5,322	6,439	7,461
Product supply revenue | Knight Agreement | Knight
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	0			0	254	0
Product supply revenue | Kyowa Kirin Agreement | Kyowa Kirin
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	0			5,322	6,185	7,461
Non-cash royalty revenue related to the sale of future royalties
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	4,789			809	7,195	1,776
Non-cash royalty revenue related to the sale of future royalties | Kyowa Kirin
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	3,400
Non-cash royalty revenue related to the sale of future royalties | Kyowa Kirin Agreement | Kyowa Kirin
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	$ 4,789	¥ 500.0		$ 809	$ 7,195	$ 1,776

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