Agreements with Royalty Pharma - Summary of Changes of Fair Value of Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
RP Ulacamten RPA [Member]
Debt Instrument [Line Items]
Beginning balance	$ 13,700	$ 14,000
Change in fair value	(200)	(300)
Ending balance	13,500	13,700
RP OM Loan Agreement [Member]
Debt Instrument [Line Items]
Beginning balance	123,500	123,000
Change in fair value	1,800	(3,600)
Ending balance	$ 125,300	$ 119,400

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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