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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:      
Net income/(loss)   $ (6,921) $ 2,622
Adjustments to reconcile net income/(loss) to net cash used in operations:      
Depreciation and amortization $ 11 36 34
Stock-based compensation   727 757
Gain on disposal of mineral property (3,540) (2,100) (6,108)
Gain on other investments (2,437) (41) (2,407)
Change in working capital account items:      
Other current assets   300 292
Accounts payable, accrued liabilities and other   561 112
Net cash used in operating activities   (7,438) (4,698)
Cash flows from investing activities:      
Proceeds from sales of marketable securities     5,788
Disposition/(acquisitions) of short-term investments, net   400 (789)
Additions to plant and equipment   (105)  
Proceeds from option/sale agreements, net   2,415 3,048
Net cash provided by investing activities   2,710 8,047
Cash flows from financing activities:      
Proceeds from equity financing, net   13,385 1,436
Payment of taxes from withheld shares   (401) (124)
Proceeds from exercise of stock options     37
Net cash provided by financing activities   12,984 1,349
Net increase in cash and cash equivalents   8,256 4,698
Cash and cash equivalents, beginning of period   7,762 1,408
Cash and cash equivalents, end of period $ 6,106 $ 16,018 $ 6,106