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Revenue - Summary Of Revenue Information By Geographical Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Revenue Information By Geographical Region [Line Items]
Total revenue	$ 11,867	$ 781	$ 14,856	$ 1,553	$ 1,554	$ 3,856
United States
Revenue Information By Geographical Region [Line Items]
Total revenue					1,215	3,848
Japan
Revenue Information By Geographical Region [Line Items]
Total revenue					332	4
Others
Revenue Information By Geographical Region [Line Items]
Total revenue					$ 7	$ 4

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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