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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net loss $ (14,818) $ (29,983)
Loss from discontinued operations 2,448 1,459
Loss from continuing operations (12,370) (28,524)
Adjustments to reconcile loss from continuing operations to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 1,718 5,002
Impairment of oil and gas properties 9,568 22,448
Change in fair value of oil price risk derivative 1,460 335
Amortization of debt issuance costs 152 28
Stock-based compensation 68 224
Gain on sale of assets (100) (16)
Decrease (increase) in:    
Oil and gas sales receivable 309 1,399
Other assets (160) 50
Increase (decrease) in:    
Accounts payable and other liabilities (948) 2,580
Accrued compensation and benefits (1,131) (10)
Net cash provided by (used in) operating activities (1,434) 3,516
Cash flows from investing activities:    
Capital expenditures (86) (3,547)
Proceeds from settlement of lawsuit involving oil and gas properties 1,500
Proceeds from sale of property and equipment 16
Net change in restricted investments (30)
Net cash used in investing activities: (86) (2,061)
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 operating activities for discontinued operations (448) (1,398)
Net increase (decrease) in cash and equivalents (1,994) 57
Cash and equivalents, beginning of period 3,354 4,010
Cash and equivalents, end of period 1,360 4,067
Supplemental disclosures of cash flow information:    
Income tax paid
Interest paid 108 129
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 5
Net additions to oil and gas properties through asset retirement obligations 1 61
Increase (decrease) in accrued capital expenditures $ 1,325