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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Operating activities:    
Net loss $ (2,923) $ (2,340)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 19 19
Amortization of capitalized lease asset 29 0
Unrealized loss on marketable equity securities 736 737
Employee stock option expense 258 510
Loss on derivative instruments 36 0
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 211 67
Note receivable, net of mineral property sold (223) 0
Accounts payable and other current liabilities (528) (7)
Net cash used in operating activities (2,385) (1,014)
Investing activities:    
Sale of short-term investments, net 2,844 1,068
Purchase of Vendetta units (233) 0
Sale of Kinross calls 10 0
Purchase of other assets (6) (11)
Net cash provided by investing activities 2,615 1,057
Financing activities:    
Purchase of common stock for cancellation (12) (75)
Net cash used in financing activities (12) (75)
Net increase (decrease) in cash and cash equivalents 218 (32)
Cash and cash equivalents, beginning of period 117 214
Cash and cash equivalents, end of period $ 335 $ 182