LICENSE, COLLABORATION AND OTHER REVENUE - Revenues Recognized From License, Collaboration and Other Significant Agreements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
License, collaboration and other revenue:
Total revenues	$ 56,376	$ 126,365	$ 96,381	$ 187,988
Mitsubishi Tanabe Pharma Corporation
License, collaboration and other revenue:
Total revenues			4,000
License, collaboration and other revenue
License, collaboration and other revenue:
Total revenues	14,132	83,056	19,431	103,307
License, collaboration and other revenue | Mitsubishi Tanabe Pharma Corporation
License, collaboration and other revenue:
Total revenues	516	434	4,678	8,398
License, collaboration and other revenue | Otsuka Pharmaceutical Company. Ltd. | Otsuka U.S. Agreement
License, collaboration and other revenue:
Total revenues	2,225	81,135	2,225	86,773
License, collaboration and other revenue | Otsuka Pharmaceutical Company. Ltd. | Otsuka International Agreement
License, collaboration and other revenue:
Total revenues	0	0	0	5,503
License, collaboration and other revenue | Total collaboration revenue
License, collaboration and other revenue:
Total revenues	2,741	81,569	6,903	100,674
License, collaboration and other revenue | JT and Torii Sublicense Agreement
License, collaboration and other revenue:
Total revenues	1,391	1,487	2,528	2,633
License, collaboration and other revenue | Medice License Agreement
License, collaboration and other revenue:
Total revenues	$ 10,000	$ 0	$ 10,000	$ 0