Nature of Operations and Organization (Details) $ in Thousands	3 Months Ended
Mar. 31, 2026 USD ($) MWd	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Powerhouse production capability, nuclear fuel \| MWd	15
Powerhouse production capability, fresh fuel \| MWd	75
Powerhouse useful life	30 years
Cash, cash equivalents, and marketable securities	$ 2,536,898
Net loss	33,065	$ 9,810
Operating loss	51,249	17,874
Net cash used in operating activities	17,867	$ 12,243
Accumulated deficit	$ 273,837		$ 240,772

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

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+ Details

- Definition

Amount of accumulated undistributed earnings (deficit).

+ References + Details