CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 13,473	$ 4,275
Restricted cash - other	1,454	1,693
Accounts receivable, net	16,608	28,644
Derivative contracts	2,004	114
Prepaid expenses	2,218	3,342
Assets held for sale	35,447	0
Other current assets	80	538
Total current assets	71,284	38,606
Oil and natural gas properties, using full cost method of accounting
Proved	1,489,793	1,484,359
Unproved	22,753	24,603
Less: accumulated depreciation, depletion and impairment	(1,335,830)	(1,129,622)
Net oil and natural gas properties	176,716	379,340
Other property, plant and equipment, net	106,665	188,603
Other assets	766	1,140
Total assets	355,431	607,689
Current liabilities
Accounts payable and accrued expenses	41,996	64,937
Current maturities of long-term debt	59,000	0
Asset retirement obligation	22,055	22,119
Liabilities held for sale	403	0
Other current liabilities	1,120	1,367
Total current liabilities	124,574	88,423
Long-term debt	0	57,500
Asset retirement obligation	52,879	52,897
Other long-term obligations	3,209	6,417
Total liabilities	180,662	205,237
Commitments and contingencies (Note 9)
Stockholders’ Equity
Common stock, $0.001 par value; 250,000 shares authorized; 35,865 issued and outstanding at June 30, 2020 and 35,772 issued and outstanding at December 31, 2019	36	36
Warrants	88,520	88,520
Additional paid-in capital	1,060,019	1,059,253
Accumulated deficit	(973,806)	(745,357)
Total stockholders’ equity	174,769	402,452
Total liabilities and stockholders’ equity	$ 355,431	$ 607,689