v3.26.1
Other Financial Information - Schedule of Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross $ 148,996 $ 87,046
Less: Accumulated depreciation (3,165) (1,640)
Property, plant and equipment, net 145,831 85,406
Finance lease right-of-use assets 1,233 1,233
Less: Accumulated amortization (313) (190)
Finance lease-right-of-use assets, net 920 1,043
Total property, plant and equipment, net 146,751 86,449
Land    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross 707 707
Land improvements    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross 611 403
Buildings    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross 7,078 7,038
Building improvements    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross 28,640 2,566
Manufacturing equipment    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross 26,331 12,404
Lab equipment    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross 5,111 3,724
Automobiles    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross 51 0
Leasehold improvements    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross 1,278 795
Furniture & fixtures    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross 72 46
Computer equipment    
Property, Plant, and Equipment [Line Items]    
Property, plant and equipment, gross 269 13
Construction in progress    
Property, Plant, and Equipment [Line Items]    
Construction in progress - Buildings 54,225 30,267
Construction in progress - Magnet plant equipment and other $ 24,623 $ 29,083