CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash	$ 10,364	$ 0
Restricted cash	0	325
Accounts receivable, net	30,901	33,145
Short-term derivative instruments	0	5,879
Prepaid expenses and other current assets	15,572	13,238
Total current assets	56,837	52,587
Property and equipment, at cost:
Oil and natural gas properties, successful efforts method	775,167	797,005
Support equipment and facilities	142,208	140,023
Other	9,102	8,045
Accumulated depreciation, depletion and impairment	(609,231)	(141,350)
Property and equipment, net	317,246	803,723
Long-term derivative instruments	873	6,364
Restricted investments	4,623	4,622
Operating lease - long term right-of-use asset	2,500	4,406
Other long-term assets	2,680	5,837
Total assets	384,759	877,539
Current liabilities:
Accounts payable	798	8,310
Revenues payable	22,563	29,167
Accrued liabilities (see Note 14)	22,677	23,358
Short-term derivative instruments	10,824	253
Total current liabilities	56,862	61,088
Long-term debt (see Note 9)	260,516	285,000
Asset retirement obligations	96,725	90,466
Long-term derivative instruments	847	305
Operating lease liability	266	2,720
Other long-term liabilities	3,280	3,753
Total liabilities	418,496	443,332
Commitments and contingencies (see Note 16)
Stockholders' equity (deficit):
Preferred stock, $0.01 par value: 50,000,000 shares authorized; no shares issued and outstanding at December 31, 2020 and 2019, respectively	0	0
Warrants, 2,173,913 and 9,153,522 warrants issued and outstanding at December 31, 2020 and 2019, respectively	4,788	4,790
Common stock, $0.01 par value: 250,000,000 shares authorized; 37,663,509 and 37,566,540 shares issued and outstanding at December 31, 2020 and 2019, respectively	378	209
Additional paid-in capital	424,104	424,399
Accumulated earnings (deficit)	(463,007)	4,809
Total stockholders' equity (deficit)	(33,737)	434,207
Total liabilities and equity	$ 384,759	$ 877,539