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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Astellas Gene Therapies, Inc. (Narrative) (Details) $ in Thousands | 1 Months Ended | 12 Months Ended | 85 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 USD ($) target indication | Aug. 31, 2024 | Dec. 31, 2024 USD ($) target indication | Dec. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) target indication
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Revenues |  |  | $ 57,800 | $ 176,232 |
Deferred revenues | $ 7,556 |  | 7,556 | 0 | $ 7,556
Deferred revenues, non-current | 5,874 |  | 5,874 | $ 0 | 5,874
Astellas Gene Therapies, Inc. |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Royalty obligation, term |  | 10 years |  |  |
Astellas Gene Therapies, Inc. | License |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Contract with customer liability | 20,000 |  | 20,000 |  | 20,000
Variable consideration amount | $ 1,300,000 |  | $ 1,300,000 |  | $ 1,300,000
Maximum number of additional targets | target | 4 |  | 4 |  | 4
Number of indications per target | indication | 3 |  | 3 |  | 3
Agreement term |  |  |  |  | 3 years
Number of targets | target | 5 |  | 5 |  | 5
Astellas Gene Therapies, Inc. | Initial License |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Contract with customer liability | $ 6,500 |  | $ 6,500 |  | $ 6,500
Revenues | 6,500 |  |  |  |
Astellas Gene Therapies, Inc. | Additional License |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Contract with customer liability | 13,500 |  | 13,500 |  | 13,500
Deferred revenues | 7,600 |  | 7,600 |  | 7,600
Deferred revenues, non-current | $ 5,900 |  | $ 5,900 |  | $ 5,900
Revenue From Contracts With Customer, Underlying Options, Exercise Or Expiration Term | 4 years |  |  |  |

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