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Basis of Presentation and Significant Accounting Policies - Summary of Disaggregated Product Revenue (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 146,563 $ 122,710 $ 287,984 $ 221,219
FIRDAPSE [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 84,845 77,372 168,576 144,214
FYCOMPA [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 34,332 36,535 69,959 66,960
AGAMREE [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 27,363 8,746 49,405 9,920 [1]
Product revenue, net [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 146,540 $ 122,653 $ 287,940 $ 221,094
[1]

*AGAMREE® net product revenue for the six months ended June 30, 2024 is for the period between March 13, 2024 (date of commercial launch) and June 30, 2024.