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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred Tax Assets, Net [Abstract]    
Asset retirement and environmental obligations $ 5,643 $ 8,744
Net operating losses 0 2,174
Inventories 12,448 6,695
Offtake Advances, net of debt discount 0 4,034
Shenghe Warrant 0 2,329
Research and experimental costs 691 0
Stock-based compensation 3,785 2,688
Organization costs 776 860
Credits 346 764
Other 351 636
Gross deferred tax assets 24,040 28,924
Less: Valuation allowance (346) (3,192)
Net deferred tax assets 23,694 25,732
Deferred Tax Liabilities, Net [Abstract]    
Property, plant and equipment (36,481) (14,077)
Prepaid expenses (1,567) (1,192)
Deferred revenue (6,604) (9,938)
Mineral rights (101,195) (104,735)
Other (200) (290)
Total deferred tax liabilities (146,047) (130,232)
Non-current deferred tax liabilities, net $ (122,353) $ (104,500)