Agreements - Additional Information (Detail)					1 Months Ended		3 Months Ended			6 Months Ended			36 Months Ended
	Jul. 11, 2025 USD ($)	Jul. 11, 2024 USD ($)	Jul. 11, 2023 USD ($)	Jul. 11, 2022 USD ($)	Jul. 31, 2023 USD ($) shares	Jul. 31, 2023 SFr / shares	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($) SFr / shares	Jun. 30, 2023 USD ($)	Jul. 11, 2025 USD ($)	Oct. 26, 2023 USD ($)	Jul. 19, 2023
License Agreement [Line Items]
Research and development expenses							$ 2,985,000		$ 3,954,000	$ 5,566,000		$ 7,516,000
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	$ 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										8.50%
Net sales royalty threshold										$ 100,000,000
U.S. Rights for FYCOMPA [Member] | Royalty More Than Hundred Million And Less Than Hundred And Twenty Five Million [Member] | Royalty Agreement Terms [Member]
License Agreement [Line Items]
Percentage of royalty on net sales										17.00%
Vamorolone [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	10 years 6 months
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
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	$ 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 Ten Million And Less Than Hundred Million [Member] | Royalty Agreement Terms [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] | Royalty Agreement Terms [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
Maximum [Member] | 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]
Net sales royalty threshold										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] | U.S. Rights for FYCOMPA [Member] | Royalty More Than Hundred Million And Less Than Hundred And Twenty Five Million [Member] | Royalty Agreement Terms [Member]
License Agreement [Line Items]
Net sales royalty threshold										125,000
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
Amount of minimum royalty payable maturity terms not met										$ 5,000,000
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
Research and development expenses				4,100,000
Up front payment				$ 10,000,000
Asset acquisition purchase price consideration		$ 10,000,000	$ 10,000,000
License Agreement For RUZURGI [Member] | Minimum [Member]
License Agreement [Line Items]
Percentage of minimum royalty payable to net sales										1.25%
License Agreement For RUZURGI [Member] | Maximum [Member]
License Agreement [Line Items]
Percentage of minimum royalty payable to net sales										2.50%