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RESTRUCTURING CHARGES - Narrative (Details) |  |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2024 employee | Nov. 01, 2023 employee | Apr. 26, 2023 employee | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Apr. 30, 2023 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  | $ 911,000 |  |  |  |
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
Restructuring charges |  |  |  | 0 |  |  |  |
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 |  |  |  | 700,000 | $ 6,700,000 |  |  |
November 2023 Restructuring Plan | Minimum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring expected cost |  |  |  | 8,700,000 |  |  |  |
November 2023 Restructuring Plan | Minimum | Forecast |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected cost remaining |  |  |  |  |  |  | $ 1,300,000 |
November 2023 Restructuring Plan | Maximum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring expected cost |  |  |  | 9,700,000 |  |  |  |
November 2023 Restructuring Plan | Maximum | Forecast |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected cost remaining |  |  |  |  |  |  | $ 2,300,000 |
November 2023 Restructuring Plan | Research and development |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  | 500,000 |  |  |  |
November 2023 Restructuring Plan | General and administrative |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  | 200,000 |  |  |  |
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 |  |  |  |  |  |
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 |  |  |  | 200,000 | $ 4,700,000 |  |  |
France Restructuring Plan | Minimum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring expected cost |  |  |  | 7,800,000 |  |  |  |
France Restructuring Plan | Minimum | Forecast |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected cost remaining |  |  |  |  |  | $ 2,900,000 |  |
France Restructuring Plan | Maximum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring expected cost |  |  |  | 9,600,000 |  |  |  |
France Restructuring Plan | Maximum | Forecast |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected cost remaining |  |  |  |  |  | $ 4,700,000 |  |
France Restructuring Plan | Research and development |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  | 100,000 |  |  |  |
France Restructuring Plan | General and administrative |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  | $ 100,000 |  |  |  |

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