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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities:    
Net loss $ (1,443) $ (1,617)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 13 12
Non-cash office lease expense 20
Unrealized loss on marketable equity securities 389 663
Employee stock option expense 173 442
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 114 48
Note receivable, net of mineral property sold (223)
Accounts payable and other current liabilities (38) 12
Net cash used in operating activities (995) (440)
Investing activities:    
Sale of short-term investments, net 1,453 509
Purchase of other assets (8)
Net cash provided by investing activities 1,453 501
Financing activities:    
Purchase of common stock for cancellation (11) (65)
Net cash used in financing activities (11) (65)
Net increase (decrease) in cash and cash equivalents 447 (4)
Cash and cash equivalents, beginning of period 117 214
Cash and cash equivalents, end of period $ 564 $ 210