v3.26.3
Description of Company and Summary of Significant Accounting Policies - Additional Information (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 14, 2025
USD ($)
$ / shares
shares
Mar. 05, 2025
shares
Feb. 14, 2025
Jan. 21, 2025
Jun. 30, 2026
USD ($)
Segment
$ / shares
Jun. 30, 2025
USD ($)
$ / shares
Mar. 31, 2025
Mar. 13, 2025
shares
Aug. 27, 2024
shares
Description of Company and Summary of Significant Accounting Policies [Line Items]                  
Common stock, par value | $ / shares         $ 0.01 $ 0.01      
Reverse stock split ratio     23 23          
Cash and cash equivalents | $         $ 19,450 $ 3,836      
Reclamation bond deposits current | $         $ 2,200 $ 1,500      
Percentage of tax benefit to be realized for recognition in the income statement           50.00%      
Units | shares                 231,884
Number of reportable segments | Segment         1        
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description         The operating results of the Company’s single reportable segment are evaluated by the Company’s Chief Executive Officer, who has been determined to be the Company’s Chief Operating Decision Maker (“CODM”), to make key operating decisions, such as the allocation of resources and the evaluation of operating segment performance.        
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]         srt:ChiefExecutiveOfficerMember        
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]         true        
Change in Accounting Principle, Accounting Standards Update, Adoption Date         Jun. 30, 2025        
Accounting Standards Update [Extensible Enumeration]         us-gaap:AccountingStandardsUpdate202307Member        
UNITED STATES                  
Description of Company and Summary of Significant Accounting Policies [Line Items]                  
Cash and cash equivalents | $         $ 19,500 $ 3,800      
Ascend Global Investment Fund SPC [Member]                  
Description of Company and Summary of Significant Accounting Policies [Line Items]                  
Transaction party beneficially         25.00%   25.00%    
BEP Special Situations IV LLC Member                  
Description of Company and Summary of Significant Accounting Policies [Line Items]                  
Transaction party beneficially         10.00%   10.00%    
Ascend Global Investment FundSpc And BEP Special Situations IVLLC Member                  
Description of Company and Summary of Significant Accounting Policies [Line Items]                  
Proceeds from issuance of common stock, net of offering costs | $ $ 4,900                
Units | shares 1,408,173                
Subscription price per share | $ / shares $ 3.5507                
Warrant to purchase aggregate of shares | shares               5,632,692  
Exchange Agreement Member | Ascend Global Investment FundSpc And BEP Special Situations IVLLC Member                  
Description of Company and Summary of Significant Accounting Policies [Line Items]                  
Common stock upon the exchange of convertible notes | shares   13,586,524              
Minimum                  
Description of Company and Summary of Significant Accounting Policies [Line Items]                  
Reverse stock split ratio       10          
Maximum [Member]                  
Description of Company and Summary of Significant Accounting Policies [Line Items]                  
Reverse stock split ratio       25          
Securities Offering                  
Description of Company and Summary of Significant Accounting Policies [Line Items]                  
Common stock, par value | $ / shares         $ 0.01        
CHESS Depositary Interests ("CDIs")                  
Description of Company and Summary of Significant Accounting Policies [Line Items]                  
Reverse stock split ratio         10        
5E Boron Americas, LLC                  
Description of Company and Summary of Significant Accounting Policies [Line Items]                  
Ownership percentage         100.00%