v3.26.1
Merger Transaction and Acquisition - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 18, 2025
USD ($)
shares
Mar. 11, 2025
$ / shares
shares
Feb. 03, 2025
USD ($)
Aug. 21, 2024
USD ($)
$ / shares
shares
Aug. 20, 2024
USD ($)
$ / shares
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Mar. 13, 2025
Mar. 12, 2025
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Business Combination [Line Items]                    
Business combination, equity conversion ratio               1    
Exchange ratio             0.204      
Goodwill | $           $ 134,848     $ 0 $ 0
Earnout and Forward Purchase Agreements                    
Business Combination [Line Items]                    
Proceeds from investment | $       $ 8,000            
Forward Purchase Agreements                    
Business Combination [Line Items]                    
Price per share (in dollars per share) | $ / shares           $ 11.00        
Number of shares issued (in shares)           (1,890,000)        
Business Combination Agreement                    
Business Combination [Line Items]                    
Equity consideration | $         $ 8,000          
Cash held in trust | $       $ 22,800            
Minimum trading day period       20 days            
Consecutive trading day period       30 days            
Business Combination Agreement | Minimum                    
Business Combination [Line Items]                    
Market price per share (in dollars per share) | $ / shares       $ 15.00            
Business Combination Agreement | Second Tranche                    
Business Combination [Line Items]                    
Shares issued in acquisition (in shares)       5,050,000.00            
Market price per share (in dollars per share) | $ / shares       $ 20.00            
Indian Ocean Rare Earth Metals Pte. Ltd.                    
Business Combination [Line Items]                    
Equity consideration | $ $ 94,557                  
Total consideration | $ 197,671                  
Cash consideration | $ 103,114                  
Goodwill | $ $ 134,848                  
Acquisition related cost | $           $ 8,100        
Less Common Metals Ltd.                    
Business Combination [Line Items]                    
Shares issued in acquisition (in shares) 6,540,000                  
Hatch Note                    
Business Combination [Line Items]                    
Converted shares (in shares)         680,000          
Convertible Promissory Note                    
Business Combination [Line Items]                    
Percentage of forgiveness         50.00%          
Common Stock                    
Business Combination [Line Items]                    
Issuance of preferred stock and warrants, net of issuance costs (in shares)         880,000          
Price per share (in dollars per share) | $ / shares         $ 12.00          
Common Stock | Forward Purchase Agreements                    
Business Combination [Line Items]                    
Cash | $           $ 20,800        
Common Stock | Business Combination Agreement                    
Business Combination [Line Items]                    
Shares issued in acquisition (in shares)       10,100,000            
Pre-Domestication Warrants                    
Business Combination [Line Items]                    
Warrant exercisable (in shares)               1    
USARE Class A Preferred Investor Warrants                    
Business Combination [Line Items]                    
Gross cash proceeds | $       $ 25,500            
Subscription receivable | $       $ 1,250            
Aggregate purchase price | $     $ 15,300              
Issuance of preferred stock and warrants, net of issuance costs (in shares)         780,000          
USA Rare Earth, Inc | Investor warrants                    
Business Combination [Line Items]                    
Warrant exercisable (in shares)               0.5    
Mr. Michael Blitzer                    
Business Combination [Line Items]                    
Percentage of forgiveness       50.00%            
Common Units Class A                    
Business Combination [Line Items]                    
Warrant exercisable (in shares)               1    
Common Units Class A | Forward Purchase Agreements                    
Business Combination [Line Items]                    
Issuance of preferred stock and warrants, net of issuance costs (in shares)   1,890,000                
Floor price (in dollars per share) | $ / shares   $ 4.00                
Common Stock                    
Business Combination [Line Items]                    
Converted shares (in shares)           4,550,000        
Common Stock | USA Rare Earth, Inc                    
Business Combination [Line Items]                    
Warrant exercisable (in shares)               1    
Class A-1 And Class A-2                    
Business Combination [Line Items]                    
Exchange ratio             1      
Series A Cumulative Convertible Preferred Stock Subject To Possible Redemption                    
Business Combination [Line Items]                    
Payment-in-kind percentage of series A cumulative convertible preferred stock subject to possible redemption           12.00%     12.00%  
Series A Preferred Stock                    
Business Combination [Line Items]                    
Payment-in-kind percentage of series A cumulative convertible preferred stock subject to possible redemption           12.00%        
Issuance of preferred stock and warrants, net of issuance costs (in shares)         780,000          
Series A Preferred Stock | Mr. Michael Blitzer                    
Business Combination [Line Items]                    
Issuance of preferred stock and warrants, net of issuance costs (in shares)         130,000          
Earnout shares | Business Combination Agreement                    
Business Combination [Line Items]                    
Shares issued in acquisition (in shares)       5,050,000.00