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COLLABORATION AND LICENSING AGREEMENTS - Narrative (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 ($)	Jun. 30, 2025 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues	$ 110,329			$ 98,241	$ 282,105	$ 217,486
Non-cash royalty revenue related to the sale of future royalties
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues	4,789			809	7,195	1,776
Licensing revenue
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues	25			20	5,065	56
Kyowa Kirin \| Non-cash royalty revenue related to the sale of future royalties
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues	3,400
Kyowa Kirin \| Kyowa Kirin Agreement \| Non-cash royalty revenue related to the sale of future royalties
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues	4,789	¥ 500.0		809	7,195	1,776
Fosun Pharma \| Fosun Agreement \| Licensing revenue
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues	0		$ 5,000	0	5,000	0
AstraZeneca \| AZ Termination Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cost of revenue	$ 0			$ 10,000	$ 12,700	$ 22,700
Maximum potential payment per agreement							$ 75,000