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Basis of Presentation and Significant Accounting Policies - Summary of Percentage of the Company's Total Net Product Revenue (Detail) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Customer A [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		72.00%	65.20%	100.00%
Customer B [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	[1]	0.00%	34.80%	0.00%
Customers [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		72.00%	100.00%	100.00%
[1] During 2023, the Company sold FYCOMPA® through a Transition Service Agreement with a U.S. subsidiary of Eisai. Effective January 1, 2024, FYCOMPA® is being sold and distributed through a third party logistics (3PL) organization under the Company's contracts.

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