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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net loss $ (787) $ (15,083)
Loss from discontinued operations 2,448
Loss from continuing operations (787) (12,635)
Adjustments to reconcile loss from continuing operations to net cash used in operating activities:    
Depreciation and depletion 723 2,422
Debt amortization 9 221
Impairment of oil and gas properties 9,568
Change in fair value of commodity price risk derivative (29) 1,557
Stock-based compensation and services 289 98
Warrant fair value adjustment (450)
Other (189) (850)
Decrease (increase) in:    
Oil and gas sales receivable 98 449
Other assets (35) (74)
Increase (decrease) in:    
Accounts payable and accrued liabilities (355) (1,111)
Accrued compensation and benefits 20 (1,120)
Net cash used in operating activities (706) (1,475)
Cash flows from investing activities:    
Capital expenditures (21) (121)
Proceeds from asset sale 23
Net cash provided by (used in) investing activities: 2 (121)
Cash flows from financing activities:    
Proceeds from issuance of preferred stock 1
Payments for debt issuance costs (105)
Cash payment for fractional shares in reverse stock split (3)
Net cash used in financing activities (107)
Discontinued operations:    
Net cash used in discontinued operations (447)
Net decrease in cash and equivalents (704) (2,150)
Cash and equivalents, beginning of period 2,518 3,354
Cash and equivalents, end of period 1,814 1,204
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 (loss) on marketable equity securities (482) 921
Net additions to oil and gas properties through asset retirement obligations $ 1