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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating activities:    
Net loss $ (489) $ (451)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized loss (gain) on derivative instruments 1 (82)
Depreciation and amortization 1 $ 3
Deferred income taxes (62)
Accrued interest income (8)
Gain on warrant liability (3) $ (49)
Employee stock option expense 2 157
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 18 3
Accounts payable and other current liabilities (92) 18
Net cash used in operating activities from continuing operations $ (632) (401)
Net cash used in operating activities from discontinued operations (2)
Net cash used in operating activities $ (632) $ (403)
Investing activities:    
Purchase of short-term investments (16,007)
Sale of derivative instruments 40 $ 84
Net cash used in investing activities from continuing operations $ (15,967) 84
Net cash used in investing activities from discontinued operations (221)
Net cash used in investing activities $ (15,967) $ (137)
Financing activities:    
Purchase of common stock for cancellation (83)
Net cash provided by financing activities (83)
Net decrease in cash and cash equivalents (16,682) $ (540)
Cash and cash equivalents, beginning of period 17,718 869
Cash and cash equivalents, end of period $ 1,036 329
Supplemental disclosure of cash flow information:    
Cash paid for interest, capitalized to mineral property 66
Capitalized non-cash interest $ 103