CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 18,799	$ 10,364
Accounts receivable, net (see Note 13)	91,967	30,901
Prepaid expenses and other current assets	15,018	15,572
Total current assets	125,784	56,837
Property and equipment, at cost:
Oil and natural gas properties, successful efforts method	799,532	775,167
Support equipment and facilities	145,324	142,208
Other	9,641	9,102
Accumulated depreciation, depletion and amortization	(634,212)	(609,231)
Property and equipment, net	320,285	317,246
Long-term derivative instruments	0	873
Restricted investments	4,622	4,623
Operating lease - long term right-of-use asset	2,716	2,500
Other long-term assets	1,693	2,680
Total assets	455,100	384,759
Current liabilities:
Accounts payable	33,819	798
Revenues payable	20,374	22,563
Accrued liabilities (see Note 13)	57,826	22,677
Short-term derivative instruments	53,144	10,824
Total current liabilities	165,163	56,862
Long-term debt (see Note 8)	230,000	260,516
Asset retirement obligations	102,398	96,725
Long-term derivative instruments	9,664	847
Operating lease liability	2,017	266
Other long-term liabilities	10,699	3,280
Total liabilities	519,941	418,496
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, 2021 and December 31, 2020	0	0
Warrants, 2,173,913 warrants issued and outstanding at December 31, 2021 and December 31, 2020	4,788	4,788
Common stock, $0.01 par value: 250,000,000 shares authorized; 38,024,142 and 37,663,509 shares issued and outstanding at December 31, 2021 and December 31, 2020, respectively	382	378
Additional paid-in capital	425,066	424,104
Accumulated deficit	(495,077)	(463,007)
Total stockholders' deficit	(64,841)	(33,737)
Total liabilities and equity	$ 455,100	$ 384,759