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Agreements - Additional Information (Detail)							1 Months Ended		3 Months Ended					9 Months Ended	12 Months Ended	42 Months Ended
Agreements - Additional Information (Detail)	Jul. 11, 2025 USD ($)	Jul. 11, 2024 USD ($)	Jul. 11, 2023 USD ($)	Jan. 24, 2023 USD ($)	Jul. 11, 2022 USD ($)	Oct. 26, 2012	Jul. 31, 2023 USD ($) shares	Jul. 31, 2023 SFr / shares	Mar. 31, 2026 USD ($) shares	Mar. 31, 2026 USD ($) SFr / shares	Dec. 31, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	Oct. 26, 2023 USD ($)	Jul. 19, 2023
License Agreement [Line Items]
Research and development expenses									$ 2,661,000			$ 3,887,000
Asset acquisition equity interests issued or issuable number of shares issued \| shares							1,414,688
Asset Acquisition Percentage Of Outstanding Ordinary Shares							11.26%
U.S. Rights for FYCOMPA [Member]
License Agreement [Line Items]
Date on which strategic collaboration is entered into				Jan. 24, 2023
Payments to acquire productive assets				$ 164,200,000
Contingent consideration liability									$ 25,000,000	$ 25,000,000
U.S. Rights for FYCOMPA [Member] \| Royalty More Than Ten Million And Less Than Hundred Million [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									6.00%
U.S. Rights for FYCOMPA [Member] \| Royalty More Than Ten Million And Less Than Hundred Million [Member] \| Royalty Agreement Terms [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									12.00%
U.S. Rights for FYCOMPA [Member] \| Royalty More Than Hundred And Twenty Five Million [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									11.00%
Net sales royalty threshold									$ 125,000,000
U.S. Rights for FYCOMPA [Member] \| Royalty More Than Hundred And Twenty Five Million [Member] \| Royalty Agreement Terms [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									22.00%
U.S. Rights for FYCOMPA [Member] \| Royalty More Than Hundred Million And Less Than Hundred And Twenty Five Million [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									17.00%
U.S. Rights for FYCOMPA [Member] \| Royalty More Than Hundred Million And Less Than Hundred And Twenty Five Million One [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									8.50%
AGAMREE [Member]
License Agreement [Line Items]
Payments to acquire productive assets							$ 75,000,000
Asset acquisition equity interests issued or issuable number of shares issued \| shares									1,414,688
Asset Acquisition Percentage Of Outstanding Ordinary Shares									11.26%
Asset Acquisition Investment Share Price \| SFr / shares										$ 9.477
Closing Market Price \| SFr / shares								SFr 8.25
Foreign Currency Exchange Rate, Translation																		1.1537
Collaborative arrangement, milestone payment obligation																	$ 36,000,000
Payment on milestone payment													$ 36,000,000
Capitalized amortized Cost													$ 36,000,000
Finite-lived intangible asset, useful life									10 years 6 months	10 years 6 months
Sales based milestone payment.									$ 12,500,000
Revenue milestones															$ 100,000,000
AGAMREE [Member] \| Royalty Less Than Hundred Million [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									5.00%
AGAMREE [Member] \| Royalty More Than Hundred Million And Less Than Two Hundred Million [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									7.00%
AGAMREE [Member] \| Royalty More Than Two Hundred Million And Less Than Three Hundred Million [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									9.00%
AGAMREE [Member] \| Royalty More Than Three Hundred Million [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									11.00%
AGAMREE [Member] \| Royalty Less Than Two Hundred Fifty Million [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									7.00%
AGAMREE [Member] \| Royalty More Two Hundred And Fifty Million And Less Than Five Hundred Million [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									8.50%
AGAMREE [Member] \| Royalty More Than Five Hundred Million And Less Than Seven Hundred Fifty Million [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									10.00%
AGAMREE [Member] \| Royalty More Seven Hundred And Fifty Million And Less Than One Billion [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									12.00%
AGAMREE [Member] \| Royalty More Than One Billion And Less Than Two Billion [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									13.00%
AGAMREE [Member] \| Royalty More Than Two Billion [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									15.00%
AGAMREE [Member] \| Royalty For Santhera Sales Based Milestones [Member]
License Agreement [Line Items]
Net sales based milestone to royalty threshold									$ 105,000,000
Net sales based milestone upon achievement of revenues											$ 12,500,000
Revenue milestones											$ 100,000,000
AGAMREE [Member] \| Royalty For Additional Indications And Milestones Of Up To Fifty Million More [Member]
License Agreement [Line Items]
Percentage of royalty payable to sales based milestone														11.00%
AGAMREE [Member] \| Royalty For Additional Indications And Milestones [Member]
License Agreement [Line Items]
Contingent consideration liability									50,000,000	$ 50,000,000
Minimum [Member] \| U.S. Rights for FYCOMPA [Member] \| Royalty More Than Ten Million And Less Than Hundred Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									10,000,000
Minimum [Member] \| U.S. Rights for FYCOMPA [Member] \| Royalty More Than Hundred And Twenty Five Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									125,000,000
Minimum [Member] \| U.S. Rights for FYCOMPA [Member] \| Royalty More Than Hundred Million And Less Than Hundred And Twenty Five Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									100,000,000
Minimum [Member] \| AGAMREE [Member] \| Royalty More Than Hundred Million And Less Than Two Hundred Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									100,000,000
Minimum [Member] \| AGAMREE [Member] \| Royalty More Than Two Hundred Million And Less Than Three Hundred Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									200,000,000
Minimum [Member] \| AGAMREE [Member] \| Royalty More Than Three Hundred Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									300,000,000
Minimum [Member] \| AGAMREE [Member] \| Royalty More Two Hundred And Fifty Million And Less Than Five Hundred Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									250,000,000
Minimum [Member] \| AGAMREE [Member] \| Royalty More Than Five Hundred Million And Less Than Seven Hundred Fifty Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									500,000,000
Minimum [Member] \| AGAMREE [Member] \| Royalty More Seven Hundred And Fifty Million And Less Than One Billion [Member]
License Agreement [Line Items]
Net sales royalty threshold									750,000,000
Minimum [Member] \| AGAMREE [Member] \| Royalty More Than One Billion And Less Than Two Billion [Member]
License Agreement [Line Items]
Net sales royalty threshold									1,000,000,000
Minimum [Member] \| AGAMREE [Member] \| Royalty More Than Two Billion [Member]
License Agreement [Line Items]
Net sales royalty threshold									2,000,000,000
Maximum [Member] \| U.S. Rights for FYCOMPA [Member] \| Royalty More Than Ten Million And Less Than Hundred Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									100,000,000					$ 100,000,000
Maximum [Member] \| U.S. Rights for FYCOMPA [Member] \| Royalty More Than Hundred Million And Less Than Hundred And Twenty Five Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									125,000,000
Maximum [Member] \| AGAMREE [Member] \| Royalty Less Than Hundred Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									100,000,000
Maximum [Member] \| AGAMREE [Member] \| Royalty More Than Hundred Million And Less Than Two Hundred Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									200,000,000
Maximum [Member] \| AGAMREE [Member] \| Royalty More Than Two Hundred Million And Less Than Three Hundred Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									300,000,000
Maximum [Member] \| AGAMREE [Member] \| Royalty Less Than Two Hundred Fifty Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									250,000,000
Maximum [Member] \| AGAMREE [Member] \| Royalty More Two Hundred And Fifty Million And Less Than Five Hundred Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									500,000,000
Maximum [Member] \| AGAMREE [Member] \| Royalty More Than Five Hundred Million And Less Than Seven Hundred Fifty Million [Member]
License Agreement [Line Items]
Net sales royalty threshold									750,000,000
Maximum [Member] \| AGAMREE [Member] \| Royalty More Seven Hundred And Fifty Million And Less Than One Billion [Member]
License Agreement [Line Items]
Net sales royalty threshold									1,000,000,000
Maximum [Member] \| AGAMREE [Member] \| Royalty More Than One Billion And Less Than Two Billion [Member]
License Agreement [Line Items]
Net sales royalty threshold									$ 2,000,000,000
License Agreement with BioMarin [Member]
License Agreement [Line Items]
Date on which strategic collaboration is entered into						Oct. 26, 2012
Percentage of royalty on net sales									3.50%
Net sales royalty threshold									$ 100,000,000
License Agreement with BioMarin [Member] \| Minimum [Member]
License Agreement [Line Items]
Royalty agreement period									7 years
Percentage of royalty on net sales									7.00%
License Agreement with BioMarin [Member] \| Maximum [Member]
License Agreement [Line Items]
Percentage of royalty on net sales									10.00%
License Agreement For RUZURGI [Member]
License Agreement [Line Items]
Date on which strategic collaboration is entered into					Jul. 11, 2022
Minimum royalty	$ 3,000,000	$ 3,000,000	$ 3,000,000		$ 3,000,000											$ 3,000,000
Up front payment					$ 10,000,000
Asset acquisition purchase price consideration		$ 10,000,000	$ 10,000,000
Amount of minimum royalty payable maturity terms not met									$ 5,000,000
License Agreement For RUZURGI [Member] \| Minimum [Member]
License Agreement [Line Items]
Percentage of minimum royalty payable to net sales									1.25%
Royalty payment									$ 5,000,000
License Agreement For RUZURGI [Member] \| Maximum [Member]
License Agreement [Line Items]
Percentage of minimum royalty payable to net sales									2.50%