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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating activities:    
Net (loss) income $ (1,770) $ 9,356
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on derivative instruments (295) (84)
Depreciation and amortization 4 7
Deferred income taxes (264) 997
Accrued interest income (3)
Gain on warrant liability (4) (49)
(Gain) loss on equity security and asset sales (net) (26) 962
Property abandonment and impairment 10
Employee stock option expense 970 470
Gain on sale of discontinued operations (12,746)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 31 (58)
Accounts payable and other current liabilities (92) (105)
Net cash used in operating activities from continuing operations (1,436) (1,253)
Net cash used in operating activities from discontinued operations (190)
Net cash used in operating activities (1,436) (1,443)
Investing activities:    
Purchase of short-term investments – net (15,518)
Additions to mineral properties (40)
Purchase of marketable equity securities (304)
Proceeds from sale of MH-LLC 24,000
Proceeds from sale of marketable equity securities 56 809
Sale of derivative instruments 45 84
Other assets, net 1
Net cash used in investing activities from continuing operations (15,761) 24,894
Net cash used in investing activities from discontinued operations (1,059)
Net cash used in investing activities (15,761) 23,835
Financing activities:    
Repayment of long-term debt (5,000)
Purchase of common stock for cancellation (214)
Net cash provided by financing activities (214) (5,000)
Net decrease in cash and cash equivalents (17,411) 17,392
Cash and cash equivalents, beginning of period 17,718 487
Cash and cash equivalents, end of period 307 17,879
Supplemental disclosure of cash flow information:    
Cash paid for interest, capitalized to mineral property 228
Capitalized non-cash interest 265
Loan to non-controlling interest 191
Issuance of stock for mineral property 51
Capitalized depreciation $ 7