Basis of Presentation and Summary of Significant Accounting Policies - Summary of Revenue Recognized (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Summaryof Significant Accounting Policies Details [Line Items]
Revenue, net	$ 5,783	$ 1,015	$ 9,321	$ 2,725
Product Revenue
Summaryof Significant Accounting Policies Details [Line Items]
Revenue, net	2,691	3	4,382	3
Product Development Contract Revenue
Summaryof Significant Accounting Policies Details [Line Items]
Revenue, net	1,179	1,012	1,246	2,722
Engineering Services Revenue
Summaryof Significant Accounting Policies Details [Line Items]
Revenue, net	$ 1,913	$ 0	$ 3,693	$ 0

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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+ Details