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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 137,260 $ 22,130
Restricted cash - other 2,264 6,136
Accounts receivable, net 21,505 19,576
Prepaid expenses 626 2,890
Other current assets 80 80
Total current assets 161,735 50,812
Oil and natural gas properties, using full cost method of accounting    
Proved 1,454,016 1,463,950
Unproved 12,255 17,964
Less: accumulated depreciation, depletion and impairment (1,373,217) (1,375,692)
Net oil and natural gas properties capitalized costs 93,054 106,222
Other property, plant and equipment, net 97,791 103,118
Other assets 332 680
Total assets 352,912 260,832
Current liabilities    
Accounts payable and accrued expenses 45,779 51,426
Asset retirement obligations 17,606 16,467
Derivative contracts 21 0
Other current liabilities 627 984
Total current liabilities 64,033 68,877
Long-term debt 0 20,000
Asset retirement obligations 41,762 40,701
Other long-term obligations 1,795 3,188
Total liabilities 107,590 132,766
Commitments and contingencies
Stockholders’ Equity    
Common stock, $0.001 par value; 250,000 shares authorized; 36,675 issued and outstanding at December 31, 2021 and 35,928 issued and outstanding at December 31, 2020 37 36
Warrants 88,520 88,520
Additional paid-in capital 1,062,737 1,062,220
Accumulated deficit (905,972) (1,022,710)
Total stockholders’ equity 245,322 128,066
Total liabilities and stockholders’ equity $ 352,912 $ 260,832