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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Line Items]        
Probability of benefit realized upon settlement uncertain tax position 50.00%      
(Loss) income before taxes from U.S. operations $ (311,000) $ (318,900) $ (315,700)  
Income before taxes from foreign operations 1,500 700 1,800  
Valuation allowance 558,794 525,703    
Net operating loss carryforwards 434,100      
Research and development credit carryforward 91,400      
Unrecognized tax benefits 17,676 14,554 $ 10,410 $ 8,335
Accrued interest or penalties 0 $ 0    
Federal        
Income Taxes [Line Items]        
Net operating loss carryforwards 1,704,200      
Research and development credit carryforward 64,400      
Operating loss carryforwards, subject to expiration 783,200      
State        
Income Taxes [Line Items]        
Net operating loss carryforwards 1,170,600      
Research and development credit carryforward $ 54,600