INCOME TAXES - Schedule of Net Operating Loss and Tax Credit Carryforwards (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 3,296
Federal R&D and orphan drug credit carryforwards	555,074
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards	208,592
Federal R&D and orphan drug credit carryforwards	169,600
Dutch | Foreign
Income Tax Contingency [Line Items]
Dutch net operating loss carryforwards	$ 31,361