v3.26.1
Net Loss per Share - Schedule of Income (Loss) Per Share Attributable to Holders of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Numerator:    
Net loss attributable to USA Rare Earth, Inc. $ (297,559) $ (15,735)
Declared and deemed dividends, and interest accretion (26,954) (8,170)
Undistributed net loss attributable to USA Rare Earth, Inc. $ (324,513) $ (23,905)
Denominator    
Weighted average shares outstanding - basic (in shares) [1] 98,021 59,538
Weighted average shares outstanding - diluted (in shares) [1] 98,021 59,538
Net loss per share attributable to USA Rare Earth, Inc.    
Basic (in Dollars per share) [1] $ (3.31) $ (0.40)
Diluted (in Dollars per share) [1] $ (3.31) $ (0.40)
[1] Fiscal 2024 Recast