v3.26.1
Investment in Cauchari-Olaroz Project - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Aug. 27, 2025
Nov. 30, 2024
Apr. 30, 2021
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Borrowings interest rate       1.75%      
Assigned loans receivable to company from restructuring $ 101,979,000            
Share of profit (loss) of associates accounted for using equity method       $ (39,766,000) $ (28,232,000) $ 16,211,000  
Share of income (loss) of Cauchari-Olaroz Project       0 0 $ (677,000)  
Investment in Cauchari-Olaroz Project       $ 93,352,000 $ 32,919,000    
Bottom of Range | Shareholder Agreement [Member]              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Percentage of share in construction costs pro rata basis       49.00%      
Top of Range | Shareholder Agreement [Member]              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Percentage of share in construction costs pro rata basis         51.00%    
JEMSE Arrangement              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Ownership interest in joint operation     4.20%        
Discount rate assumed       1000.00%      
Share of Equity financing reimburse of construction project in prior years     $ 23,496,000        
Reimbursement of ownership interest amount receivable 8,271,000            
Agreement description     This reimbursement obligation is measured at the initial transaction date and will be settled through the assignment of one-third of dividends otherwise payable to JEMSE in future periods        
Additional accounts receivable at fair value 2,789,000     $ 2,789,000      
Fair value of the long-term receivable       8,077,000 $ 7,935,000    
Loss on reimbursement of ownership interest amount (5,879,000)            
Share of profit (loss) of associates accounted for using equity method       (3,382,000)      
Reduction in investments 8,668,000            
Cauchari-Olaroz              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Contribution To Investment Accounted For Using Equity Method       99,422,000 1,570,000    
Unrecognized income to the investment       (26,043,000)      
Loss equal to the carrying value of the investment       39,766,000      
Share of income (loss) of Cauchari-Olaroz Project       $ (13,724,000) (17,374,000)    
Unrecognized shares losses         26,043,000    
Ganfeng | JEMSE Arrangement              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Reimbursement of ownership interest amount receivable 8,609,000            
Minera Exar S.A.              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Ownership interest in joint operation       44.80%      
Percentage of Fact and Basis for Preparation of Financial Information When not Going Concern basis       100.00%      
Third party loan       $ 292,690,000 210,400,000    
Cash and cash equivalents and short-term investments       86,882,000 $ 11,190,000    
Secured loans, current       10,000,000      
Unsecured loans, current       $ 9,300,000      
Unsecured bonds issued   $ 50,000,000          
Borrowings interest rate   8.00%          
Assigned loans receivable from restructuring 208,121,000            
Percentage of share production basis       49.00%      
Gains (losses) on change in fair value of derivatives       $ 89,949      
Elimination of capitalized intercompany interest       (133,512,000)      
Investment in Cauchari-Olaroz Project       $ 60,883      
Minera Exar S.A. | Tranche One              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Unsecured bonds issued   $ 25,000,000          
Borrowings, maturity   May 11, 2027          
Minera Exar S.A. | Tranche Two              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Unsecured bonds issued   $ 25,000,000          
Borrowings, maturity   November 11, 2027          
Minera Exar S.A. | JEMSE Arrangement              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Ownership interest in joint operation     8.50%        
Minera Exar S.A. | Equity Accounting Investments | JEMSE Arrangement              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Ownership interest in joint operation       8.50%      
Minera Exar S.A. | Ganfeng              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Ownership interest in joint operation       46.70%      
Ownership interest in joint operation         49.00%    
Borrowings, maturity       The loan is secured by a standby letter of credit provided by Ganfeng. As the standby letter of credit was issued for a standard one-year term, the loan was initially structured with a one-year maturity to align with the term of the standby letter. Upon extension of the related standby letter of credit, the loan will automatically roll over for the remainder of the three-year term. Included within these loans is $120,000 in bank debt facilities closed in the second quarter of 2025 and fully drawn in the third quarter of 2025 to refinance maturing short-term loans and for other purposes. These loans were priced at an approximately SOFR plus 2.5%, including fees. A portion of these debt proceeds remained in Exar’s cash balance as of December 31, 2025;      
Extended debt maturity period       3 years      
Loans with extension maturity       $ 100,000      
Non-interest bearing loan         $ 107,800,000    
Minera Exar S.A. | Ganfeng | Loan Secured By Letter Of Credit [Member]              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Secured loans, noncurrent       $ 220,000,000     $ 120,000,000
Minera Exar S.A. | Ganfeng | JEMSE Arrangement              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Ownership interest in joint operation     4.30%        
Minera Exar S.A. | Ganfeng | SOFR              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Interest rate       2.50%      
Exar Capital B.V.              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Percentage of Fact and Basis for Preparation of Financial Information When not Going Concern basis       100.00%      
Cancelled loans owed by third parties $ 99,422,000            
Investment in Cauchari-Olaroz Project       $ 32,470      
Other receivables       $ 26,789,000 $ 32,122,000    
Exar Capital B.V. | Bottom of Range              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Interest rate       8.12%      
Exar Capital B.V. | Top of Range              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Interest rate       8.95%      
Exar Capital B.V. | Cauchari-Olaroz              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Ownership interest in joint operation       49.00%      
Exar Capital B.V. | Ganfeng | Cauchari-Olaroz              
Disclosure Of Investments Accounted For Using Equity Method [Line Items]              
Ownership interest in joint operation       51.00%