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RESTRUCTURING CHARGES - Narrative (Details) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 01, 2024 employee | Nov. 01, 2023 USD ($) employee | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
France Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees eliminated in restructuring | employee | 93 |  |  |  |  |  |
Percentage of positions eliminated in restructuring (as a percent) | 24.00% |  |  |  |  |  |
Restructuring costs incurred (reduced) |  |  | $ 0 | $ (2,200,000) | $ 2,400,000 | $ 0 |
November 2023 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees eliminated in restructuring | employee |  | 162 |  |  |  |  |
Percentage of positions eliminated in restructuring (as a percent) |  | 40.00% |  |  |  |  |
Restructuring costs incurred (reduced) |  |  | 0 | $ 200,000 |  | 0 | $ 200,000
November 2023 Restructuring Plan | Minimum |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring expected cost |  | $ 7,800,000 |  |  |  |  |
Expected cost remaining |  |  | 900,000 |  |  | $ 900,000 |
Remaining restructuring term (in years) |  |  |  |  |  | 1 year |
November 2023 Restructuring Plan | Maximum |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring expected cost |  | $ 8,800,000 |  |  |  |  |
Expected cost remaining |  |  | 1,900,000 |  |  | $ 1,900,000 |
Remaining restructuring term (in years) |  |  |  |  |  | 2 years |
November 2023 Restructuring Plan | Research and development |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs incurred (reduced) |  |  | 100,000 |  |  | $ 100,000 |
November 2023 Restructuring Plan | General and administrative |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs incurred (reduced) |  |  | $ 100,000 |  |  | $ 100,000 |
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 |  |  |  |  |

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