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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Cash Flows From Operating Activities:    
Net loss $ (19,619) $ (21,316)
Net loss attributable to non-controlling interests 0 (4)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 1,476 3,602
Impairment of oil and gas properties 0 1,337
Depreciation, depletion, amortization and accretion 5,080 5,144
Gain on settlement of payables (1,282) 0
Gain on sale of oil and gas properties 0 (525)
Gain on sale of equity investment 0 (566)
Loss from equity method investments 0 91
Interest expense deferred and capitalized in restructuring 6,887 2,527
Amortization of debt discount 5,576 6,519
(Gain) loss on debt extinguishment 0 (2,192)
Changes in operating assets and liabilities:    
Accounts receivable 381 (156)
Accounts receivable - oil and gas 562 2,051
Accounts receivable - oil and gas - related party 0 21
Accounts receivable - related party 19 39
Prepaid expenses and other current assets (23) (69)
Accounts payable (3,277) (4,050)
Accrued expenses (2,286) 630
Accrued expenses - related parties 490 227
Revenue payable 42 (272)
Advances for joint operations 0 (657)
Net cash used in operating activities (5,974) (7,619)
Cash Flows From Investing Activities:    
Cash paid for drilling costs (75) (235)
Proceeds from sale of equity investment 0 500
Net cash provided by (used in) investing activities (75) 265
Cash Flows From Financing Activities:    
Proceeds from issuance of common stock, net of offering costs 0 2,780
Proceeds from notes payable 6,295 0
Cash paid for deferred financing costs   0
Repayment of notes payable (651) (863)
Repayment of notes payable - related party 0 (100)
Cash paid for stock repurchase and retirement (74) 0
Net cash provided by financing activities 5,570 1,817
Net decrease in cash (479) (5,537)
Cash at beginning of year 1,138 6,675
Cash at end of year 659 1,138
Cash paid for:    
Interest 553 5,077
Income taxes 0 0
Noncash investing and financing activities:    
Accrual of oil and gas development costs 8 3,851
Acquisition of oil and gas properties for assumption of accounts payable 3,587 0
Issuance of restricted common stock for services upon vesting maturity 7 0
Issuance of common stock in settlement of payables 588 0
Issuance of common stock to Bridge Note holders due to conversion 0 102
Rescission of common stock issued in private placement   0
Deferred financing costs related to warrants issued in conjunction with notes payable   0
Reclass of notes payable - Bridge Notes to convertible notes   0
Consolidation of non-controlling interest in PEDCO MSL   0
Reclass of deposit for business acquisitions to notes receivable   0
Beneficial conversion feature of convertible - notes payable - Bridge Notes    0
Reclass of notes payable - related parties to - Bridge Notes   0
Debt discount related to the warrants issued to Bridge Notes   0
Changes in estimates of asset retirement obligations (7) 24
Accounts receivable from purchase of oil and gas property 0 1,678
Accounts payable from purchase of oil and gas property 0 751
Note receivable sold for purchase of oil and gas properties 0 5,000
Notes payable - Subordinated assumed as part of purchase of oil and gas properties 0 8,353
Issuance of Redeemable Series A Convertible Preferred Stock for purchase of oil and gas properties 0 28,402
Issuance of common stock for purchase of oil and gas properties 0 2,734
Sale of oil and gas properties for promisory note 0 4,101
Minority interest capitalized from PEDCO MSL (59) 0
Fair value of warrants issued as debt discount $ 636 $ 160