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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating activities:    
Net loss $ (651) $ (593)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on derivative instruments (132) (83)
Depreciation and amortization 3 5
Deferred income taxes (237)
Accrued interest income (2)
(Gain) on warrant liability (4) (21)
Gain on equity security and asset sales (net) (16) (371)
Property abandonment and impairment 10
Employee stock option expense 31 313
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 25 (20)
Accounts payable and other current liabilities (29) 141
Net cash used in operating activities from continuing operations (1,000) (631)
Net cash used in operating activities from discontinued operations (22)
Net cash used in operating activities (1,000) (653)
Investing activities:    
Purchase of short-term investments (16,007)
Additions to mineral properties (40)  
Purchase of marketable equity securities (304)  
Proceeds from sale of marketable equity securities 40 519
Sale of derivative instruments 45 84
Other assets, net 8
Net cash used in investing activities from continuing operations (16,266) 611
Net cash used in investing activities from discontinued operations (763)
Net cash used in investing activities (16,266) (152)
Financing activities:    
Purchase of common stock for cancellation (201)
Net cash provided by financing activities (201)
Net decrease in cash and cash equivalents (17,467) (805)
Cash and cash equivalents, beginning of period 17,718 869
Cash and cash equivalents, end of period 251 64
Supplemental disclosure of cash flow information:    
Cash paid for interest, capitalized to mineral property 133
Capitalized non-cash interest 206
Loan to non-controlling interest 100
Issuance of stock for mineral property $ 51