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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Line Items]      
U.S. federal tax at statutory rate 21.00% 21.00% 21.00%
Current income tax expense (benefit) $ 1,624 $ 0 $ 0
Deferred income tax expense (benefit) 0 0 0
Increase (decrease) in valuation allowance, deferred tax assets 5,800 22,500 4,700
Research and development tax credit carryforwards 7,726 6,152  
Decrease in deferred tax asset 44,900    
Income tax paid, state and local, after refund received 700 0 0
Federal      
Income Tax Disclosure [Line Items]      
Net operating loss carryforwards 1,240,800 1,245,800 1,230,400
Net operating loss carryforwards indefinitely due to tax cut and jobs act 663,800    
Research and development tax credit carryforwards 5,000    
State      
Income Tax Disclosure [Line Items]      
Net operating loss carryforwards 562,200 $ 584,300 $ 590,800
Research and development tax credit carryforwards $ 3,400