Annual report [Section 13 and 15(d), not S-K Item 405]

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Line Items]      
Valuation allowance, deferred tax assets $ 46,698,000 $ 329,234,000  
Deferred tax assets 245,852,000 0  
Valuation allowance decreased 282,500,000 $ 9,400,000  
Unrecognized tax benefits decrease, evaluation of prior orphan drug credits     $ 4,700,000
Tax positions subject to interest or penalties 0    
Federal      
Income Tax Disclosure [Line Items]      
Net operating loss carryforwards 919,000,000.0    
Federal | Research Tax Credit Carryforward      
Income Tax Disclosure [Line Items]      
Amount of tax credit carryforward 45,600,000    
Federal | Earliest Tax Year      
Income Tax Disclosure [Line Items]      
Net operating loss carryforwards 779,900,000    
State and local      
Income Tax Disclosure [Line Items]      
Net operating loss carryforwards 324,600,000    
State and local | Research Tax Credit Carryforward      
Income Tax Disclosure [Line Items]      
Amount of tax credit carryforward $ 32,900,000