Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 2,538	$ 6,068
Accounts receivable:
Oil, natural gas liquid and natural gas sales	12,289	4,680
Joint interest owners and other, net	794	867
Related parties	162	847
Derivative financial instruments	472	1,730
Prepaid expenses and other	2,365	2,631
Total current assets	18,620	16,823
Oil and gas properties, net, using the successful efforts method of accounting	556,171	428,336
Other property and equipment, net	14,099	1,421
Other noncurrent assets	2,918	1,561
Restricted certificates of deposit		76
Total assets	591,808	448,217
Current liabilities
Accounts payable	25,901	14,896
Accounts payable – related parties	389	1,135
Oil, natural gas liquid and natural gas sales payable	8,747	3,568
Accrued liabilities	16,583	9,947
Accrued liabilities – related parties		224
Derivative financial instruments	12,336	2,985
Total current liabilities	63,956	32,755
Long-term liabilities
Long-term debt	301,155	204,122
Long-term debt - related parties		3,400
Deferred tax liability	4,769	33,960
Other non-current liabilities	1,316	6,052
Equity warrant liability	508	1,565
Equity warrant liability - related parties	963	2,994
Asset retirement obligations	5,649	2,683
Derivative financial instruments	9,802	1,125
Total liabilities	388,118	288,656
Commitments and contingencies
Stockholders’ equity
Series A-1 convertible participating preferred stock, $0.001 par value, and Series B convertible participating preferred stock, $0.001 par value, 83,968 and 0 shares, respectively, issued and outstanding at December 31, 2017, and none issued and outstanding at December 31, 2016
Additional paid-in capital	174,871	87,260
Accumulated deficit	(113,836)	(70,351)
Total stockholders’ equity	203,690	159,561
Total liabilities and stockholders’ equity	591,808	448,217
Class A Voting Common Stock
Stockholders’ equity
Common stock	$ 142,655	$ 142,652