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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Pfizer Inc. (Details) $ in Millions	1 Months Ended		12 Months Ended	76 Months Ended	83 Months Ended
	Dec. 31, 2017 USD ($)	May 31, 2017 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2024 USD ($) product milestone	Mar. 31, 2024 USD ($) milestone
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		$ 70.0
Potential amount to be funded for achievement of specified commercialized and sales milestones		266.5
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		208.5
Pfizer Inc. | S B Five Two Five
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Milestone revenue receivable		220.0
Pfizer Inc. | Other products
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Milestone revenue receivable		$ 175.0
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			$ 134.0
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					$ 55.0
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	$ 12.0			$ 5.0
Collaborative arrangement transaction price	17.0
Number of products approved | product				0
Number of milestones included in transaction price | milestone				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	60.0
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	$ 90.0

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