v3.26.1
Joint Venture With General Motors - Schedule of Net Assets, Respective Interests and Non-controlling Interest (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]          
Assets $ 3,535,899   $ 3,535,899   $ 2,579,048
Liabilities (1,586,322)   (1,586,322)   (992,399)
GM's non-controlling interest 532,443   532,443   527,895
The Company's controlling interest 1,417,134   1,417,134   1,058,754
Non-controlling interest in Lithium Nevada Ventures          
Balance at beginning of period     527,895    
Capital contribution   $ 100,000      
Non-controlling interests share of income (489) $ (802) 4,548 $ (1,626)  
Balance at end of period 532,443   532,443   527,895
Lithium Nevada Ventures [Member]          
Schedule of Equity Method Investments [Line Items]          
Assets 2,753,406   2,753,406   2,059,293
Liabilities (1,352,241)   (1,352,241)   (670,097)
Net assets 1,401,165   1,401,165   1,389,196
GM's non-controlling interest 532,443   532,443   527,895
The Company's controlling interest 868,722   868,722   861,301
Non-controlling interest in Lithium Nevada Ventures          
Balance at beginning of period     527,895 $ 310,336 310,336
Capital contribution     0   70,930
Non-controlling interests share of income [1]     4,548   35,825
Balance at end of period $ 532,443   532,443   527,895
General Motors Holdings LLC [Member]          
Non-controlling interest in Lithium Nevada Ventures          
Capital contribution     $ 0   $ 110,804
[1] The Company allocates income and net assets between the controlling and non-controlling interests based on a hypothetical liquidation at book value.