CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 0	$ 49,704
Restricted cash	325	325
Accounts receivable	33,145	29,514
Short-term derivative instruments	5,879	18,813
Prepaid expenses and other current assets	13,238	7,241
Total current assets	52,587	105,597
Property and equipment, at cost:
Oil and natural gas properties, successful efforts method	797,005	598,331
Support equipment and facilities	140,023	108,760
Other	8,045	6,625
Accumulated depreciation, depletion and impairment	(141,350)	(85,535)
Property and equipment, net	803,723	628,181
Long-term derivative instruments	6,364	2,469
Restricted investments	4,622	94,467
Operating lease - long term right-of-use asset	4,406	0
Other long-term assets	5,837	6,129
Total assets	877,539	836,843
Current liabilities:
Accounts payable	8,310	2,345
Revenues payable	29,167	24,779
Accrued liabilities (see Note 16)	23,358	23,155
Short-term derivative instruments	253	139
Total current liabilities	61,088	50,418
Long-term debt (see Note 11)	285,000	294,000
Asset retirement obligations	90,466	75,867
Long-term derivative instruments	305	0
Operating lease liability	2,720	0
Other long-term liabilities	3,753	0
Total liabilities	443,332	420,285
Commitments and contingencies (see Note 18)
Stockholders' equity:
Preferred stock, $0.01 par value: 50,000,000 shares authorized; no shares issued and outstanding at December 31, 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 December 31, 2019 and 2,173,913 warrants issued and outstanding at December 31, 2018, respectively	4,790	4,788
Common stock, $0.01 par value: 250,000,000 shares authorized; 37,566,540 shares issued and outstanding at December 31, 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	424,399	355,872
Accumulated earnings	4,809	55,895
Total stockholders' equity	434,207	416,558
Total liabilities and equity	$ 877,539	$ 836,843