Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 6,568	$ 6,068
Accounts receivable:
Oil, natural gas liquid and natural gas sales	6,054	4,680
Joint interest owners and other, net	1,648	867
Related parties		847
Derivative financial instruments	7,823	1,730
Prepaid expenses and other	5,445	2,631
Total current assets	27,538	16,823
Oil and gas properties, net, using the successful efforts method of accounting	545,489	439,228
Other property and equipment, net	2,608	1,421
Derivative financial instruments	2,681
Other noncurrent assets	3,963	1,561
Restricted certificates of deposit	76	76
Total assets	582,355	459,109
Current liabilities
Accounts payable	10,346	14,894
Accounts payable – related parties	176	1,135
Oil, natural gas liquid and natural gas sales payable	6,153	3,568
Accrued liabilities	23,083	9,947
Accrued liabilities – related parties	472	224
Derivative financial instruments	120	2,985
Total current liabilities	40,350	32,753
Long-term debt	267,203	204,122
Long-term debt - related parties		3,400
Deferred tax liability	27,035	38,020
Other non-current liabilities	6,201	6,052
Equity warrant liability	577	1,565
Equity warrant liability - related parties	1,098	2,994
Asset retirement obligations	5,019	2,683
Derivative financial instruments	1,284	1,125
Total liabilities	348,767	292,714
Commitments and contingencies
Stockholders’ equity
Additional paid-in capital	102,107	87,260
Accumulated deficit	(83,909)	(63,517)
Total stockholders’ equity	160,853	166,395
Total liabilities and stockholders’ equity	582,355	459,109
Series A-2 Convertible Participating Preferred Stock
Mezzanine equity
Series A-2 convertible participating preferred stock, $0.001 par value, 74,600 issued and outstanding at June 30, 2017 and 0 issued and outstanding at December 31, 2016	72,735
Class A Voting Common Stock
Stockholders’ equity
Common stock	142,652	$ 142,652
Series A-1 and Series B Convertible Participating Preferred Stock
Stockholders’ equity
Series A-1 convertible participating preferred stock, $0.001 par value and Series B convertible participating preferred stock, $0.001 par value, 5,400 shares and 2,684,632 shares issued and outstanding at June 30, 2017, respectively, 0 and 0 issued and outstanding at December 31, 2016, respectively	3
Total stockholders’ equity	$ 3