LICENSE, COLLABORATION AND OTHER REVENUE - Changes in Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Contract liability:
Balance at End of Period	$ 43,296
Accounts receivable
Contract asset:
Balance at Beginning of Period	3,333	$ 1,901
Additions	4,037	943
Deductions	(5,542)	(2,319)
Balance at End of Period	1,828	525
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	(695)	(3,738)
Balance at End of Period	$ 43,296	$ 43,296