UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 7,408	$ 49,704
Restricted cash	325	325
Accounts receivable	32,554	29,514
Short-term derivative instruments	20,709	18,813
Prepaid expenses and other current assets	15,919	7,241
Total current assets	76,915	105,597
Property and equipment, at cost:
Oil and natural gas properties, successful efforts method	784,119	598,331
Support equipment and facilities	137,267	108,760
Other	12,431	6,625
Accumulated depreciation, depletion and impairment	(129,460)	(85,535)
Property and equipment, net	804,357	628,181
Long-term derivative instruments	17,715	2,469
Restricted investments	4,622	94,467
Operating lease - long term right-of-use asset	4,925	0
Other long-term assets	6,095	6,129
Total assets	914,629	836,843
Current liabilities:
Accounts payable	6,472	2,345
Revenues payable	26,754	24,779
Accrued liabilities (see Note 13)	26,327	23,155
Short-term derivative instruments	209	139
Total current liabilities	59,762	50,418
Long-term debt (see Note 8)	278,000	294,000
Asset retirement obligations	89,104	75,867
Long-term derivative instruments	489	0
Operating lease liability	3,214	0
Other long-term liabilities	4,015	0
Total liabilities	434,584	420,285
Commitments and contingencies (see Note 15)
Stockholders' equity:
Preferred stock, $0.01 par value: 50,000,000 shares authorized; no shares issued and outstanding at September 30, 2019 and Preferred stock, $0.0001 par value 45,000,000 shares authorized; no shares issued and outstanding at December 31, 2018	0	0
Warrants, 9,153,522 warrants issued and outstanding at September 30, 2019 and 2,173,913 warrants issued and outstanding at December 31, 2018, respectively	4,790	4,788
Common stock, $0.01 par value: 300,000,000 shares authorized; 39,978,099 shares issued and outstanding at September 30, 2019 and Common stock, $0.0001 par value 300,000,000 shares authorized; 22,181,881 shares issued and outstanding at December 31, 2018	209	3
Additional paid-in capital	435,019	355,872
Accumulated earnings	40,027	55,895
Total stockholders' equity	480,045	416,558
Total liabilities and equity	$ 914,629	$ 836,843