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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Biogen MA, Inc. (Narrative) (Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 15, 2023 USD ($) | Mar. 31, 2023 USD ($) | May 31, 2020 USD ($) | Apr. 30, 2020 USD ($) product_target $ / shares shares | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2020 USD ($) | Feb. 29, 2020 USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
General and administrative expense |  |  |  |  | $ 44,727,000 | $ 61,167,000 |  |
Deferred revenues |  |  |  |  | 7,556,000 | 0 |  |
Biogen MA, Inc. |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Change in estimate of transaction price, increase in revenue | $ 127,100,000 |  |  |  |  |  |  |
Biogen MA, Inc. | License and Service |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Fixed consideration |  |  |  |  |  |  |  | $ 204,600,000
Cumulative catch-up to expense |  | $ 2,500,000 |  |  |  |  |  |
General and administrative expense |  |  |  |  | 0 | 2,600,000 |  |
Deferred revenues |  |  |  |  | 0 | $ 0 |  |
Biogen MA, Inc. | Stock Purchase Agreement |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares |  |  |  | 24,420,157 |  |  |  |
Sale of stock, price per share (in dollars per share) | $ / shares |  |  |  | $ 9.2137 |  |  |  |
Consideration received from sale of stock |  |  |  | $ 225,000,000 |  |  |  |
Sale of stock, excess consideration received on transaction |  |  |  | 79,600,000 |  |  |  |
Collaboration agreement, equity issued |  |  |  | 145,400,000 |  |  |  |
Biogen MA, Inc. | Collaboration and License Agreement |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Proceeds from collaborators |  |  | $ 125,000,000 | $ 125,000,000 |  |  |  |
Number of neurological disease gene targets selected by counterparty (in product targets) | product_target |  |  |  | 4 |  |  |  |
Number of additional neurological disease gene targets | product_target |  |  |  | 7 |  |  |  |
Collaborative Arrangement Transaction Price | $ 17,300,000 |  |  |  |  |  |  |
Collaboration arrangement, commission fee, portion of gross proceeds, value |  |  |  |  |  |  | $ 7,000,000 |
Collaborative agreement, percent of initial recognition |  |  |  | 2.00% |  |  |  |
Contract with customer, asset, after allowance for credit Loss |  |  |  |  | $ 4,100,000 |  |  |

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