v3.26.1
Net Loss per Share - Schedule of Loss Per Share Attributable to Holders of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator:        
Net loss attributable to USA Rare Earth, Inc. $ (10,333) $ (142,506) $ (77,322) $ (90,674)
Declared and deemed dividends, and interest accretion (733) 0 (1,442) 0
Undistributed net loss attributable to USA Rare Earth, Inc. $ (11,066) $ (142,506) $ (78,764) $ (90,674)
Denominator        
Weighted average shares outstanding - basic (in shares) 230,081 92,769 213,347 91,598
Weighted average shares outstanding - diluted (in shares) 230,081 92,769 213,347 91,598
Net loss per share attributable to USA Rare Earth, Inc.        
Basic (in Dollars per share) $ (0.05) $ (1.54) $ (0.37) $ (0.99)
Diluted (in Dollars per share) $ (0.05) $ (1.54) $ (0.37) $ (0.99)