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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Pfizer Inc. (Details)	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended	37 Months Ended	82 Months Ended	89 Months Ended
	Dec. 31, 2017 USD ($)	May 31, 2017 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2024 USD ($) milestone product	Sep. 30, 2024 USD ($) milestone
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues			$ 49,412,000	$ 9,398,000	$ 50,249,000	$ 174,190,000
Pfizer Inc.
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Agreement termination, term		15 years
Pfizer Inc. | S B Five Two Five And Other Products
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues under agreement		$ 70,000,000
Potential amount to be funded for achievement of specified commercialized and sales milestones		266,500,000
Pfizer Inc. | S B Five Two Five And Other Products | 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		208,500,000
Pfizer Inc. | S B Five Two Five
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Milestone revenue receivable		$ 220,000,000
Pfizer Inc. | 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%
Pfizer Inc. | 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%
Pfizer SB-525
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Collaborative arrangement transaction price							$ 134,000,000
Revenues			0	0	0	0
Pfizer SB-525 | S B Five Two Five And Other Products
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Collaborative arrangement, number of milestones achieved | milestone										2
Milestone payments received										$ 55,000,000
Alexion Pharmaceuticals, Inc., AstraZeneca Rare Disease
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Agreement termination, term	15 years
Alexion Pharmaceuticals, Inc., AstraZeneca Rare Disease | 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%
Alexion Pharmaceuticals, Inc., AstraZeneca Rare Disease | 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%
Alexion Pharmaceuticals, Inc., AstraZeneca Rare Disease | C9ORF72
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Milestone payments received	$ 12,000,000								$ 5,000,000
Collaborative arrangement transaction price								$ 17,000,000
Number of products approved | product									0
Number of milestones included in transaction price | milestone									0
Revenues			$ 0	$ 0	$ 0	$ 0
Alexion Pharmaceuticals, Inc., AstraZeneca Rare Disease | 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	60,000,000
Alexion Pharmaceuticals, Inc., AstraZeneca Rare Disease | 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	$ 90,000,000

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