Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 3,767	$ 5,355
Accounts receivable
Oil, natural gas liquid and natural gas sales	16,880	15,103
Joint interest owners and others, net	3,695	4,541
Related parties	76	301
Derivative financial instruments	3,393	15,841
Prepaid expenses and other	1,933	1,966
Total current assets	29,744	43,107
Oil and gas properties, using the successful efforts method of accounting
Proved properties	909,077	960,711
Unproved properties	79,616	81,850
Other property and equipment	20,865	17,727
Less accumulated depreciation, depletion, amortization and impairment	(346,748)	(369,529)
Property and equipment, net	662,810	690,759
Deferred tax asset	552	0
Derivative financial instruments	1,524	7,302
Other non-current assets	2,357	2,944
Total assets	696,987	744,112
Current liabilities
Accounts payable	20,113	18,260
Accounts payable – related parties	238	181
Oil, natural gas liquid and natural gas sales payable	13,549	13,022
Accrued liabilities	19,872	28,128
Derivative financial instruments	16,317	430
Total current liabilities	70,089	60,021
Long-term liabilities
Long-term debt	448,149	436,882
Asset retirement obligations	6,751	7,195
Deferred tax liabilities, net	0	12,370
Warrant liability	402	366
Warrant liability – related parties	755	689
Derivative financial instruments	2,305	21
Other non-current liabilities	3,926	4,021
Total long-term liabilities	462,288	461,544
Commitments and contingencies (Note 12)
Stockholders' Equity
Common stock	142,655	142,655
Series A-1 convertible participating preferred stock, $0.001 par value, 93,849 and 91,784 shares issued and outstanding, respectively	0	0
Additional paid-in capital	175,006	174,379
Accumulated deficit	(153,051)	(94,487)
Total stockholders' equity	164,610	222,547
Total liabilities and stockholders' equity	$ 696,987	$ 744,112