v3.26.1
Mezzanine and Stockholders’ Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 18, 2025
shares
Sep. 29, 2025
USD ($)
shares
May 02, 2025
USD ($)
$ / shares
Mar. 13, 2025
shares
Dec. 31, 2025
USD ($)
segment
$ / shares
shares
Dec. 31, 2024
USD ($)
shares
May 03, 2025
$ / shares
Mar. 12, 2025
shares
Mezzanine and Stockholders’ Equity [Line Items]                
Preferred stock, authorized (in shares)         50,000,000      
Preferred stock (in dollars per share) | $ / shares         $ 0.0001      
Percentage of stated value of preferred stock         100.00%      
Volume-weighted average price, period         20 days      
Conversion period after closing date         6 months      
Proceeds from issuance of common stock and warrants under PIPE financing, net | $         $ 190,077 $ 0    
Less Common Metals Ltd.                
Mezzanine and Stockholders’ Equity [Line Items]                
Shares issued in acquisition (in shares) 6,540,000              
Pre-Domestication Warrants                
Mezzanine and Stockholders’ Equity [Line Items]                
Warrant exercisable (in shares)               1
$75M PIPE                
Mezzanine and Stockholders’ Equity [Line Items]                
Proceeds from issuance of common stock and warrants under PIPE financing, net | $     $ 75,000          
Loss on issuance of common stock | $     $ 36,900          
$125M PIPE                
Mezzanine and Stockholders’ Equity [Line Items]                
Proceeds from issuance of common stock and warrants under PIPE financing, net | $   $ 125,000            
Conversions (in shares)   8,330,000            
Paid in Cash                
Mezzanine and Stockholders’ Equity [Line Items]                
Percentage of dividend rate of preferred stock         10.00%      
Series A Cumulative Convertible Preferred Stock Subject To Possible Redemption                
Mezzanine and Stockholders’ Equity [Line Items]                
Payment-in-kind percentage of series A cumulative convertible preferred stock subject to possible redemption         12.00% 12.00%    
Series A Cumulative Convertible Preferred Stock Subject To Possible Redemption | First Anniversary                
Mezzanine and Stockholders’ Equity [Line Items]                
Accrued value redeemable, percentage         150.00%      
Series A Cumulative Convertible Preferred Stock Subject To Possible Redemption | Second Anniversary                
Mezzanine and Stockholders’ Equity [Line Items]                
Accrued value redeemable, percentage         140.00%      
Series A Cumulative Convertible Preferred Stock Subject To Possible Redemption | Third Anniversary                
Mezzanine and Stockholders’ Equity [Line Items]                
Accrued value redeemable, percentage         130.00%      
Series A Cumulative Convertible Preferred Stock Subject To Possible Redemption | Fourth Anniversary                
Mezzanine and Stockholders’ Equity [Line Items]                
Accrued value redeemable, percentage         120.00%      
Series A Cumulative Convertible Preferred Stock Subject To Possible Redemption | Fifth Anniversary                
Mezzanine and Stockholders’ Equity [Line Items]                
Accrued value redeemable, percentage         110.00%      
Series A Cumulative Convertible Preferred Stock Subject To Possible Redemption | After Fifth Anniversary                
Mezzanine and Stockholders’ Equity [Line Items]                
Accrued value redeemable, percentage         100.00%      
Series A Preferred Stock                
Mezzanine and Stockholders’ Equity [Line Items]                
Payment-in-kind percentage of series A cumulative convertible preferred stock subject to possible redemption         12.00%      
Preferred stock, authorized (in shares)         15,000,000.0      
Preferred stock (in dollars per share) | $ / shares             $ 12.00  
Conversion price (in dollars per share) | $ / shares         $ 7.50      
Conversion price reduced (in dollars per share) | $ / shares     $ 7.00          
Common Units Class A                
Mezzanine and Stockholders’ Equity [Line Items]                
Warrant exercisable (in shares)               1
Common Stock | USA Rare Earth, Inc                
Mezzanine and Stockholders’ Equity [Line Items]                
Warrant exercisable (in shares)               1
Lock-Up Agreement                
Mezzanine and Stockholders’ Equity [Line Items]                
Exchange of shares (in shares)       6,250,000        
Percentage of transfer of shares       50.00%        
Excess stock, shares removed (in shares)         3,125,000      
Percentage of transfer of shares after year two 50.00%              
Percentage of transfer of shares after year three 50.00%              
Common Stock                
Mezzanine and Stockholders’ Equity [Line Items]                
Total common stock, % of voting | segment         1      
Conversion price (in dollars per share) | $ / shares         $ 10.00      
Conversions (in shares)         7,128,000      
Common Stock | Common Stock                
Mezzanine and Stockholders’ Equity [Line Items]                
Conversions (in shares) [1]           878,000    
[1] The shares of the Company’s common stock, common stock units and preferred stock units prior to the Merger have been retrospectively recast to reflect the change in the capital structure as a result of the Merger.