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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 |  |

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