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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Operating activities:    
Net loss $ (1,492) $ (1,420)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 13 12
Amortization of right of use lease asset 21 20
Unrealized (gain) loss on marketable equity securities (256) (102)
Unrealized (gain) loss on short-term investments 0 (35)
Stock-based compensation expense 415 126
(Gain) on sale of marketable equity securities (54) 0
Loss (gain) on derivative instruments 21 (23)
Changes in operating assets and liabilities:    
Prepaid expenses and other (364) (328)
Accounts payable and other current liabilities 126 (15)
Net cash used in operating activities (1,570) (1,765)
Investing activities:    
Sale of short-term investments, net 388 1,909
Purchase of mineral property (55) 0
Purchase of other assets (12) (9)
Cash from sale of marketable equity securities 54 0
Sale of derivative instruments 39 31
Net cash provided by investing activities 414 1,931
Financing activities:    
Issuance of common stock - net of issuing costs 1,218 0
Issuance of common stock upon exercise of stock options 14 14
Net cash provided by financing activities 1,232 14
Net increase in cash and cash equivalents 76 180
Cash, cash equivalents and restricted cash, beginning of period 200 316
Cash, cash equivalents and restricted cash, end of period 276 496
Supplemental Cash Flow information:    
Acquisition of right to use asset $ 0 $ 87