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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net loss $ (404) $ (14,818)
Loss from discontinued operations 2,448
Loss from continuing operations (404) (12,370)
Adjustments to reconcile loss from continuing operations to net cash used in operating activities:    
Depreciation and depletion 674 1,718
Debt amortization 27
Impairment of oil and gas properties 9,568
Change in fair value of oil price risk derivative (311) 1,460
Stock-based compensation and services 212 68
Warrant fair value adjustment (520)
Other (8) 52
Decrease (increase) in:    
Oil and gas sales receivable (79) 309
Other assets (138) (160)
Increase (decrease) in:    
Accounts payable and accrued liabilities (948)
Accrued compensation and benefits 14 (1,131)
Net cash used in operating activities (533) (1,434)
Cash flows from investing activities:    
Capital expenditures (22) (86)
Proceeds from asset sale 24
Net cash provided by investing activities: 2 (86)
Cash flows from financing activities:    
Proceeds from issuance of preferred stock 1
Payments for debt issuance costs (24)
Cash payment for fractional shares in reverse stock split (3)
Net cash used in financing activities (26)
Discontinued operations:    
Net cash used in discontinued operations (448)
Net decrease in cash and equivalents (531) (1,994)
Cash and equivalents, beginning of period 2,518 3,354
Cash and equivalents, end of period 1,987 1,360
Non-cash investing and financing activities:    
Issuance of preferred stock in disposition of mining segment 1,999
Elimination of asset retirement obligations in disposition of mining segment 204
Unrealized gain on marketable equity securities 927
Net additions to oil and gas properties through asset retirement obligations $ 1