Basis of Presentation and Summary of Significant Accounting Policies - Professional Engineering Contracts (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Revenue	$ 8,504	$ 1
Basic net loss per share (in usd per share)	$ 0.25	$ 0.00
Diluted net loss per share (in usd per share)	$ 0.25	$ 0.00
Significant contract, equivalent annual cost adjustment to revenue	$ 7,800	$ 1,100