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RESTRUCTURING CHARGES - Narrative (Details)
 3 Months Ended
Mar. 01, 2024
employee
Nov. 01, 2023
employee
Apr. 26, 2023
employee
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Apr. 30, 2023
USD ($)
Restructuring Cost and Reserve [Line Items]                
Restructuring charges       $ 911,000        
April 2023 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 expected cost               $ 5,000,000
Restructuring charges       0        
April 2023 Restructuring Plan | Full-Time Employees                
Restructuring Cost and Reserve [Line Items]                
Number of employees eliminated in restructuring | employee     55          
April 2023 Restructuring Plan | Contracted Employees                
Restructuring Cost and Reserve [Line Items]                
Number of employees eliminated in restructuring | employee     55          
November 2023 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       700,000 $ 6,700,000      
November 2023 Restructuring Plan | Minimum                
Restructuring Cost and Reserve [Line Items]                
Restructuring expected cost       8,700,000        
November 2023 Restructuring Plan | Minimum | Forecast                
Restructuring Cost and Reserve [Line Items]                
Expected cost remaining             $ 1,300,000  
November 2023 Restructuring Plan | Maximum                
Restructuring Cost and Reserve [Line Items]                
Restructuring expected cost       9,700,000        
November 2023 Restructuring Plan | Maximum | Forecast                
Restructuring Cost and Reserve [Line Items]                
Expected cost remaining             $ 2,300,000  
November 2023 Restructuring Plan | Research and development                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges       500,000        
November 2023 Restructuring Plan | General and administrative                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges       200,000        
November 2023 Restructuring Plan | Full-Time Employees                
Restructuring Cost and Reserve [Line Items]                
Number of employees eliminated in restructuring | employee   108            
November 2023 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]                
Number of employees eliminated in restructuring | employee 93              
Percentage of positions eliminated in restructuring 24.00%              
Restructuring charges       200,000 $ 4,700,000      
France Restructuring Plan | Minimum                
Restructuring Cost and Reserve [Line Items]                
Restructuring expected cost       7,800,000        
France Restructuring Plan | Minimum | Forecast                
Restructuring Cost and Reserve [Line Items]                
Expected cost remaining           $ 2,900,000    
France Restructuring Plan | Maximum                
Restructuring Cost and Reserve [Line Items]                
Restructuring expected cost       9,600,000        
France Restructuring Plan | Maximum | Forecast                
Restructuring Cost and Reserve [Line Items]                
Expected cost remaining           $ 4,700,000    
France Restructuring Plan | Research and development                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges       100,000        
France Restructuring Plan | General and administrative                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges       $ 100,000