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RESTRUCTURING CHARGES - Narrative (Details)
$ in Thousands
 12 Months Ended
Mar. 01, 2024
employee
Nov. 01, 2023
employee
Apr. 26, 2023
employee
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Restructuring Cost and Reserve [Line Items]            
Restructuring charges       $ 16,364    
April Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Number of employees eliminated in restructuring | employee     110      
Percentage of positions eliminated in restructuring     23.00%      
Restructuring charges       5,000    
April Restructuring Plan | Research and development            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges       3,800    
April Restructuring Plan | General and administrative            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges       1,200    
April Restructuring Plan | Full-Time Employees            
Restructuring Cost and Reserve [Line Items]            
Number of employees eliminated in restructuring | employee     55      
April Restructuring Plan | Contracted Employees            
Restructuring Cost and Reserve [Line Items]            
Number of employees eliminated in restructuring | employee     55      
November Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Number of employees eliminated in restructuring | employee   162        
Percentage of positions eliminated in restructuring   40.00%        
Restructuring charges       6,700    
November Restructuring Plan | Minimum            
Restructuring Cost and Reserve [Line Items]            
Restructuring expected cost       8,700    
November Restructuring Plan | Minimum | Forecast            
Restructuring Cost and Reserve [Line Items]            
Additional estimated costs remaining           $ 2,000
November Restructuring Plan | Maximum            
Restructuring Cost and Reserve [Line Items]            
Restructuring expected cost       9,700    
November Restructuring Plan | Maximum | Forecast            
Restructuring Cost and Reserve [Line Items]            
Restructuring expected cost           $ 3,000
November Restructuring Plan | Research and development            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges       5,000    
November Restructuring Plan | General and administrative            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges       1,700    
November Restructuring Plan | Full-Time Employees            
Restructuring Cost and Reserve [Line Items]            
Number of employees eliminated in restructuring | employee   108        
November Restructuring Plan | Contracted Employees            
Restructuring Cost and Reserve [Line Items]            
Number of employees eliminated in restructuring | employee   54        
France Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges       4,700    
France Restructuring Plan | Subsequent Event            
Restructuring Cost and Reserve [Line Items]            
Number of employees eliminated in restructuring | employee 93          
Percentage of positions eliminated in restructuring 24.00%          
France Restructuring Plan | Minimum            
Restructuring Cost and Reserve [Line Items]            
Restructuring expected cost       7,800    
France Restructuring Plan | Minimum | Forecast            
Restructuring Cost and Reserve [Line Items]            
Additional estimated costs remaining         $ 3,100  
France Restructuring Plan | Maximum            
Restructuring Cost and Reserve [Line Items]            
Restructuring expected cost       11,500    
France Restructuring Plan | Maximum | Forecast            
Restructuring Cost and Reserve [Line Items]            
Additional estimated costs remaining         $ 6,800  
France Restructuring Plan | Research and development            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges       3,600    
France Restructuring Plan | General and administrative            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges       $ 1,100