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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Operating Activities:    
Net loss $ (12,657) $ (7,751)
Reconciliation of net loss to cash used in operations:    
Non-cash lease expense 120 128
Depreciation and amortization 249 221
Write-down of raw material inventory 964 0
Stock compensation expense 1,326 837
Uranium royalties write-off   (1,150)
Effect of changes in operating working capital items:    
Decrease (increase) in other long-term assets 2,744 (3,306)
Decrease in prepaids and other current assets 171 130
Increase (decrease) in payables and accrued liabilities 1,269 (539)
Net Cash Used In Operating Activities (5,814) (11,430)
Investing Activities:    
Capital expenditures (6,146) (58,295)
Proceeds from sale of assets 1,508  
Net Cash Used In Investing Activities (4,638) (58,295)
Financing Activities:    
Payment of debt issuance costs (132)  
Issuance of common stock, net of issuance costs 4,110 5,497
Payment of minimum withholding taxes on net share settlements of equity awards (100) (108)
Payments on finance lease liabilities (6) (8)
Net Cash Provided By Financing Activities 3,872 5,381
Net decrease in Cash and Cash Equivalents (6,580) (64,344)
Cash and Cash Equivalents, Beginning of Period 10,852 75,196
Cash and Cash Equivalents, End of Period 4,272 10,852
Supplemental Cash Flow Information    
Non-cash right-of-use asset obtained in exchange for operating lease liability   377
Non-cash right-of-use asset obtained in exchange for finance lease liability   28
Accrued capital expenditures (at end of period) 6,382 5,309
Accrued debt issuance costs (at end of period) 1,510  
Total Supplemental Cash Flow Information $ 7,892 $ 5,714