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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating activities:    
Net loss $ (441) $ (1,004)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 7 6
Non-cash office lease expense 10
Unrealized loss of marketable equity securities 326 441
Employee stock option expense 88 10
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 64 32
Note receivable, net of mineral property sold (223)
Accounts payable and other current liabilities (3) 24
Net cash used in operating activities (172) (491)
Investing activities:    
Sale of short-term investments, net 602 408
Purchase of other assets (8)
Net cash provided by investing activities 602 400
Financing activities:    
Purchase of common stock for cancellation (9) (26)
Net cash used in financing activities (9) (26)
Net increase (decrease) in cash and cash equivalents 421 (117)
Cash and cash equivalents, beginning of period 117 214
Cash and cash equivalents, end of period $ 538 $ 97