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Basis of Presentation and Significant Accounting Policies - Summary of Disaggregated Product Revenue (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 491,734 $ 398,204 $ 214,203
FIRDAPSE [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 306,035 258,426 213,938
FYCOMPA [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [1] 137,251 138,076  
AGAMREE [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] 46,041    
Product revenue, net [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 489,327 $ 396,502 $ 213,938
[1]

+ FYCOMPA® net product revenue for the year ended December 31, 2023 is for the period between January 24, 2023 (date of acquisition) and December 31, 2023.

[2] AGAMREE® net product revenue for the year ended December 31, 2024 is for the period between March 13, 2024 (date of commercial launch) and December 31, 2024.