Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 25,500	$ 15,655
Revenue receivable	6,814	15,340
Joint interest billing receivable	2,520	6,597
Other receivable	2,447	7,750
Derivative asset	0	1,174
Deposit for surety bonds	12,438	8,300
Other current assets	2,249	2,125
Total current assets	51,968	56,941
Oil and gas properties:
Oil and gas properties, full cost method	1,354,593	1,369,861
Unevaluated oil and gas properties	18,947	21,854
Accumulated depreciation, depletion and amortization	(1,296,992)	(1,285,660)
Oil and gas properties, net	76,548	106,055
Other property and equipment	9,280	9,353
Accumulated depreciation of other property and equipment	(9,003)	(8,843)
Total property and equipment	76,825	106,565
Other assets	1,645	792
Total assets	130,438	164,298
Current liabilities:
Accounts payable to vendors	2,959	32,148
Advances from co-owners	463	1,730
Oil and gas revenue payable	8,576	19,344
Accrued interest	18,196	1,724
Asset retirement obligation	459	687
Derivative liability	0	731
Other accrued liabilities	7,310	6,476
Total current liabilities	37,963	62,840
Multi-draw Term Loan	49,716	27,963
Asset retirement obligation	2,337	30,623
Preferred stock dividend payable	14,133	10,278
Other long-term liabilities	526	131
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $.001 par value; authorized 5,000 shares; issued and outstanding 1,495 shares	1	1
Common stock, $.001 par value; authorized 150,000 shares; issued and outstanding 25,587 and 25,521 shares, respectively	26	26
Paid-in capital	314,154	313,244
Accumulated other comprehensive income (loss)	(401)	278
Accumulated deficit	(572,345)	(562,484)
Total stockholders’ equity	(258,565)	(248,935)
Total liabilities and stockholders’ equity	130,438	164,298
10% Senior Secured Notes due 2021 | Senior Notes
Current liabilities:
10% Senior Secured Notes	9,707	9,821
10% Senior Secured PIK Notes due 2021 | Payment in Kind (PIK) Note
Current liabilities:
10% Senior Secured Notes	$ 274,621	$ 271,577