Collaborative Research and Development Agreements - Schedule of Milestones Payable (Details) - Vanda Pharmaceuticals Inc $ in Millions	6 Months Ended
Jun. 30, 2026 USD ($)
FDA Regulatory Approval For Marketing Of First Licensed Product In The USA For The Treatment Of Active Flares In GPP
Disaggregation of Revenue [Line Items]
Milestones that may be recognized in the future	$ 5.0
Regulatory Approval For Marketing Of The First Licensed Product In The EU
Disaggregation of Revenue [Line Items]
Milestones that may be recognized in the future	5.0
Commercial Sales Milestone
Disaggregation of Revenue [Line Items]
Milestones that may be recognized in the future	25.0
Cumulative Milestones Recognized
Disaggregation of Revenue [Line Items]
Collaboration revenue	0.0
Milestones Yet To Be Recognized
Disaggregation of Revenue [Line Items]
Milestones that may be recognized in the future	$ 35.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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