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RESTRUCTURING CHARGES - Narrative (Details)
 3 Months Ended 6 Months Ended
Mar. 01, 2024
employee
Nov. 01, 2023
employee
Apr. 26, 2023
USD ($)
employee
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges             $ 2,784,000      
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     $ 5,000,000.0              
Restructuring charges       $ 0   $ 5,000,000 0 $ 5,000,000    
April 2023 Restructuring Plan | Research and development                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges           3,800,000   3,800,000    
April 2023 Restructuring Plan | General and administrative                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges           $ 1,200,000   $ 1,200,000    
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         $ 6,700,000          
November 2023 Restructuring Plan | Minimum                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring expected cost       8,100,000     8,100,000      
November 2023 Restructuring Plan | Minimum | Forecast                    
Restructuring Cost and Reserve [Line Items]                    
Expected cost remaining                   $ 1,000,000.0
November 2023 Restructuring Plan | Maximum                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring expected cost       9,100,000     9,100,000      
November 2023 Restructuring Plan | Maximum | Forecast                    
Restructuring Cost and Reserve [Line Items]                    
Expected cost remaining                   $ 2,000,000.0
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         $ 4,700,000          
Restructuring costs incurred       2,400,000            
France Restructuring Plan | Minimum                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring expected cost       7,300,000     7,300,000      
France Restructuring Plan | Minimum | Forecast                    
Restructuring Cost and Reserve [Line Items]                    
Expected cost remaining                 $ 200,000  
France Restructuring Plan | Maximum                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring expected cost       $ 7,600,000     $ 7,600,000      
France Restructuring Plan | Maximum | Forecast                    
Restructuring Cost and Reserve [Line Items]                    
Expected cost remaining                 $ 500,000