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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Astellas Gene Therapies, Inc. (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 USD ($) indication target | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Revenues |  | $ 581,000 | $ 49,412,000 | $ 25,324,000 | $ 50,249,000
Deferred revenues | $ 7,556,000 | 7,556,000 |  | 7,556,000 |
Deferred revenues, non-current | $ 5,874,000 | 5,874,000 |  | 5,874,000 |
Astellas Gene Therapies, Inc. |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Royalty obligation, term (in years) | 10 years |  |  |  |
Recognition of license revenue | Astellas Gene Therapies, Inc. |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Number of additional targets | target | 4 |  |  |  |
Number of indications per target | indication | 3 |  |  |  |
Agreement term (in years) | 3 years |  |  |  |
Contract with customer liability | $ 20,000,000 |  |  |  |
Variable consideration amount | $ 1,300,000,000 |  |  |  |
Number of targets | target | 5 |  |  |  |
Initial License | Astellas Gene Therapies, Inc. |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Contract with customer liability | $ 6,500,000 |  |  |  |
Revenues | 6,500,000 |  |  |  |
Additional Licenses | Astellas Gene Therapies, Inc. |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Contract with customer liability | $ 13,500,000 | 13,500,000 |  | 13,500,000 |
Revenues |  | 0 | $ 0 |  |
Deferred revenues |  | 7,600,000 |  | 7,600,000 |
Underlying options, exercise or expiration term (in years) | 4 years |  |  |  |
Deferred revenues, non-current |  | $ 5,900,000 |  | $ 5,900,000 |

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