Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 5,355	$ 2,538
Accounts receivable
Oil, natural gas liquid and natural gas sales	15,103	12,289
Joint interest owners and other, net	4,541	794
Related parties	301	162
Derivative financial instruments	15,841	472
Prepaid expenses and other	1,966	2,365
Total current assets	43,107	18,620
Proved properties	960,711	747,370
Unproved properties	81,850	81,511
Other property and equipment	17,727	15,763
Less accumulated depreciation, depletion, amortization and impairment	(369,529)	(274,374)
Property and equipment, net	690,759	570,270
Derivative financial instruments	7,302	0
Other non-current assets	2,944	2,918
Total assets	744,112	591,808
Current liabilities
Accounts payable	18,260	25,901
Accounts payable – related parties	181	389
Oil, natural gas liquid and natural gas sales payable	13,022	8,747
Accrued liabilities	28,128	16,583
Derivative financial instruments	430	12,336
Total current liabilities	60,021	63,956
Long-term liabilities
Long-term debt	436,882	301,155
Asset retirement obligations	7,195	5,649
Deferred tax liability, net	12,370	4,769
Equity warrant liability	366	508
Equity warrant liability - related parties	689	963
Derivative financial instruments	21	9,802
Other non-current liabilities	4,021	1,316
Total long-term liabilities	461,544	324,162
Commitments and contingencies
Stockholders’ equity
Series A-1 convertible participating preferred stock, $0.001 par value, 91,784 and 83,968 shares issued and outstanding, respectively	0	0
Additional paid-in capital	174,379	174,871
Accumulated deficit	(94,487)	(113,836)
Total stockholders’ equity	222,547	203,690
Total liabilities and stockholders’ equity	744,112	591,808
Class A Voting Common Stock
Stockholders’ equity
Common stock	142,655	142,655
Class B Non-Voting Common Stock
Stockholders’ equity
Common stock	$ 0	$ 0