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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 |

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