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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating activities:    
Net loss $ (453) $ (1,770)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on derivative instruments (267) (295)
Depreciation and amortization 8 4
Deferred income taxes (15) (264)
Accrued interest income  
Gain on warrant liability (4)
Gain on equity security and asset sales, net (577) (26)
Property abandonment and impairment 10
Employee stock option expense 23 970
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (37) 31
Accounts payable and other current liabilities 10 (92)
Net cash used in operating activities (1,308) (1,436)
Investing activities:    
Sale (purchase) of short-term investments, net 3,254 (15,518)
Loan to Zazu (1,500)
Purchase of Zazu – net of cash acquired (417)
Additions to mineral property (40)
Additions to other assets (2)
Purchase of marketable equity securities (578) (304)
Proceeds from sale of marketable equity securities 666 56
Sale of derivative instruments 55 45
Net cash provided by (used in) investing activities 1,478 (15,761)
Financing activities:    
Purchase of common stock for cancellation (28) (214)
Net cash used in financing activities (28) (214)
Net increase (decrease) in cash and cash equivalents 142 (17,411)
Cash and cash equivalents, beginning of period 119 17,718
Cash and cash equivalents, end of period 261 307
Supplemental disclosure of non-cash activities:    
Additions to mining equipment –Zazu (100)
Additions to mineral property- Zazu (15,728)
Additions to current assets, net – Zazu (42)
Issuance of common stock – Zazu acquisition 13,654
Convertible debenture – due from Zazu cancelled 1,510
Asset retirement obligation - Lik 125
Issuance of replacement options – Zazu 164
Transfer of warrant value to marketable equity securities on exercise of Vendetta Warrants $ 949