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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Pfizer Inc. (Narrative) (Details) $ in Thousands	1 Months Ended			12 Months Ended			37 Months Ended	44 Months Ended	85 Months Ended	92 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2017 USD ($)	May 31, 2017 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2024 USD ($) product milestone	Dec. 31, 2024 USD ($) milestone
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	$ 7,556
Subsequent Event | Forecast
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Agreement termination, consideration				$ 5,000
Pfizer
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Agreement termination, term		15 years	15 years
Milestone payments received		$ 12,000
Pfizer | License
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues under agreement			$ 70,000
Potential amount to be funded for achievement of specified commercialized and sales milestones			$ 266,500
Collaborative arrangement, number of milestones achieved | milestone										2
Milestone payments received										$ 55,000
Revenues					0	0		$ 134,000
Deferred revenues	$ 5,000				$ 5,000				5,000	$ 5,000
Revenue, Performance Obligation, Termination Fee, Payable Term					60 days
Revenue, Performance Obligation, Termination Fee, Payable Term If Sublicense Transfers	30 days
Pfizer | License | Minimum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Percentage of net sales per developed licensed product which will trigger royalties by counterparty		14.00%	14.00%
Pfizer | License | Maximum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Percentage of net sales per developed licensed product which will trigger royalties by counterparty		20.00%	20.00%
Pfizer | License | Achievement of specified clinical development intellectual property and regulatory milestones
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Development and sales-based milestone payments to be received			$ 208,500
Pfizer | C9ORF72
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Milestone payments received									$ 5,000
Revenues					$ 0	$ 0	$ 17,000
Number of products approved | product									0
Number of milestones included in transaction price | milestone									0
Pfizer | C9ORF72 | Achievement of specified preclinical development clinical development and first commercial sale milestones | Maximum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Development and sales-based milestone payments to be received		$ 60,000
Pfizer | C9ORF72 | Achievement of commercial milestones | Maximum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Development and sales-based milestone payments to be received		$ 90,000

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