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Summary of Significant Accounting Policies - Schedule of Long-Lived Assets by Geographical Region (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Non-Current Assets [Line Items]
Long-lived assets	$ 2,609	$ 14,590
Switzerland
Non-Current Assets [Line Items]
Long-lived assets	1,527	1,460
United Kingdom
Non-Current Assets [Line Items]
Long-lived assets	0	12,133
United States
Non-Current Assets [Line Items]
Long-lived assets	$ 1,082	$ 997

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- Definition

Assets, Noncurrent, Excluding Joint Ventures

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- Definition

Non-Current Assets [Line Items]

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- Details

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- Details

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