v3.26.1
Agreements with Royalty Pharma - Summary of Changes of Fair Value of Liabilities (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
RP Ulacamten RPA [Member]            
Debt Instrument [Line Items]            
Beginning balance $ 13,500 $ 13,700 $ 13,700 $ 14,000 $ 13,700 $ 14,000
Change in fair value (300) (200) 300 (300)    
Ending balance 13,200 13,500 14,000 13,700 13,200 14,000
RP OM Loan Agreement [Member]            
Debt Instrument [Line Items]            
Beginning balance 125,300 123,500 119,400 123,000 123,500 123,000
Change in fair value (2,100) 1,800 14,300 (3,600)    
Ending balance $ 123,200 $ 125,300 $ 133,700 $ 119,400 $ 123,200 $ 133,700