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Revenue Recognition (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |
Performance obligations satisfied in prior period, amount recognized | $ 1,400,000 | $ 2,100,000
Opening contract liability | 800,000 | $ 1,000,000
Contract assets recognized | 0 |
Thacker Pass |  |
Disaggregation of Revenue [Line Items] |  |
Reimbursable costs | 4,900,000 |
Advance paid | 3,500,000 |
Cost reimbursement, commercial mining milestone, fee | 4,700,000 |
Thacker Pass | Equipment |  |
Disaggregation of Revenue [Line Items] |  |
Equipment acquired | $ 23,300,000 |
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Primary term of contract | 3 years |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Primary term of contract | 5 years |
Maximum | Thacker Pass |  |
Disaggregation of Revenue [Line Items] |  |
Capital expenditures | $ 50,000,000 |

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