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RESTRUCTURING CHARGES - Narrative (Details) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 01, 2024 employee | Nov. 01, 2023 employee | Apr. 26, 2023 employee | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
November Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges, net |  |  |  | $ 0.2 | $ 6.7
November Restructuring Plan | Research and development |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges, net |  |  |  |  | 5.0
November Restructuring Plan | General and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges, net |  |  |  |  | 1.7
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 expected cost |  |  |  |  | 4.8
Restructuring charges, net |  |  |  | 0.1 | 4.7
France Restructuring Plan | Research and development |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges, net |  |  |  |  | 3.6
France Restructuring Plan | General and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges, net |  |  |  |  | 1.1
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 charges, net |  |  |  | 0.0 | 5.0
April 2023 Restructuring Plan | Research and development |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges, net |  |  |  |  | 3.8
April 2023 Restructuring Plan | General and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges, net |  |  |  |  | 1.2
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% |  |  |
November 2023 Restructuring Plan | Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expected cost |  |  |  |  | 7.8
Additional estimated costs remaining |  |  |  | 0.9 |
November 2023 Restructuring Plan | Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expected cost |  |  |  |  | $ 8.8
Additional estimated costs remaining |  |  |  | $ 1.9 |
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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