LICENSE, COLLABORATION AND OTHER REVENUE - Changes in Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Contract liability:
Balance at End of Period	$ 43,991
Accounts receivable
Contract asset:
Balance at Beginning of Period	3,333	$ 1,901
Additions	2,327	417
Deductions	(2,968)	(1,901)
Balance at End of Period	2,692	417
Prepaid expenses and other current assets
Contract asset:
Balance at Beginning of Period		781
Additions		0
Deductions		(781)
Balance at End of Period		0
Deferred revenue
Contract liability:
Balance at Beginning of Period	43,296	47,034
Additions	695	0
Deductions	0	(3,738)
Balance at End of Period	$ 43,991	$ 43,296