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DESCRIPTION OF BUSINESS (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 10, 2026	Apr. 03, 2025	May 10, 2024	Apr. 30, 2025	Jun. 30, 2025	Jun. 30, 2025	Jun. 30, 2026	Dec. 31, 2025
DESCRIPTION OF BUSINESS
Accumulated deficit							$ 652,711	$ 546,371
Cash, cash equivalents and marketable securities							$ 460,700
Shares issued		9,935,419
Share price		$ 20.13
Gross proceeds				$ 200,000
Proceeds from issuance of common stock				187,100		$ 187,362
Underwriting discounts and commissions				12,000
Offering expenses				$ 900
Sevasemten program \| Disposed of by sale
DESCRIPTION OF BUSINESS
Annual net sales milestone payment	$ 300,000
Annual net sales threshold amount	550,000
Aggregate potential consideration	2,650,000
Common Stock
DESCRIPTION OF BUSINESS
Shares issued					9,935,419
Subsequent event \| Sevasemten program \| Disposed of by sale
DESCRIPTION OF BUSINESS
Consideration	1,550,000
Additional contingent consideration	1,100,000
Proceeds from the Sevasemten Sale received	1,550,000
Subsequent event \| Sevasemten program \| Disposed of by sale \| Approval For Becker Muscular Dystrophy, Adult And Adolescent Populations
DESCRIPTION OF BUSINESS
Payment on marketing approval	200,000
Subsequent event \| Sevasemten program \| Disposed of by sale \| Approval For Becker Muscular Dystrophy, Adult Populations
DESCRIPTION OF BUSINESS
Payment on marketing approval	100,000
Subsequent event \| Sevasemten program \| Disposed of by sale \| Approval For Duchenne Muscular Dystrophy
DESCRIPTION OF BUSINESS
Payment on marketing approval	$ 600,000
At-the-market program \| Common Stock \| Maximum
DESCRIPTION OF BUSINESS
Maximum potential aggregate sales proceeds, sales agreement			$ 175,000