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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Line Items]      
Increase (decrease) in deferred tax assets valuation allowance $ 49,600 $ 42,000 $ 45,500
Deferred tax assets, net operating loss carryforwards for federal 764,600    
Deferred tax assets, net operating loss carryforwards for state 338,900    
Research and development tax credit carryforwards 54,336 44,264  
Refundable research tax credits recognized 5,900 5,100 4,700
Accrued interest and/or penalties 300 200  
Unrecognized tax benefits that would impact effective tax rate 1,200 1,200 $ 1,200
Prepaid Expenses and Other Current Assets      
Income Taxes [Line Items]      
Refundable research tax credits 3,100 2,000  
Other noncurrent assets      
Income Taxes [Line Items]      
Refundable research tax credits 15,300 $ 12,100  
French      
Income Taxes [Line Items]      
Deferred tax assets, net operating loss carryforwards for foreign 118,700    
Federal      
Income Taxes [Line Items]      
Research and development tax credit carryforwards 45,300    
State      
Income Taxes [Line Items]      
Research and development tax credit carryforwards $ 31,300