Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 3,340	$ 5,355
Accounts receivable
Oil, natural gas liquid and natural gas sales	18,074	15,103
Joint interest owners and others, net	3,774	4,541
Related parties	24	301
Derivative financial instruments	7,143	15,841
Prepaid expenses and other	2,751	1,966
Total current assets	35,106	43,107
Oil and gas properties, using the successful efforts method of accounting
Proved properties	976,638	960,711
Unproved properties	78,872	81,850
Other property and equipment	21,150	17,727
Less accumulated depreciation, depletion and amortization	(368,117)	(369,529)
Property and equipment, net	708,543	690,759
Derivative financial instruments	5,457	7,302
Other non-current assets	2,421	2,944
Total assets	751,527	744,112
Current liabilities
Accounts payable	30,021	18,260
Accounts payable – related parties	195	181
Oil, natural gas liquid and natural gas sales payable	13,339	13,022
Accrued liabilities	47,019	28,128
Derivative financial instruments	10,176	430
Total current liabilities	100,750	60,021
Long-term liabilities
Long-term debt	459,466	436,882
Asset retirement obligations	6,897	7,195
Deferred tax liabilities, net	682	12,370
Warrant liability	127	366
Warrant liability – related parties	234	689
Derivative financial instruments	1,726	21
Other non-current liabilities	3,043	4,021
Total long-term liabilities	472,175	461,544
Commitments and contingencies (Note 12)
Stockholders' Equity
Class A voting common stock, $0.001 par value, 100,000,000 shares authorized, 24,933,853 and 24,645,825 issued and outstanding, respectively	142,655	142,655
Series A-1 convertible participating preferred stock, $0.001 par value, 95,961 and 91,784 shares issued and outstanding, respectively	0	0
Additional paid-in capital	175,709	174,379
Accumulated deficit	(139,762)	(94,487)
Total stockholders' equity	178,602	222,547
Total liabilities and stockholders' equity	$ 751,527	$ 744,112