CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 6,287	$ 4,275
Restricted cash - other	1,454	1,693
Accounts receivable, net	21,039	28,644
Derivative contracts	6,253	114
Prepaid expenses	3,096	3,342
Other current assets	527	538
Total current assets	38,656	38,606
Oil and natural gas properties, using full cost method of accounting
Proved	1,487,721	1,484,359
Unproved	24,298	24,603
Less: accumulated depreciation, depletion and impairment	(1,160,486)	(1,129,622)
Net oil and natural gas properties	351,533	379,340
Other property, plant and equipment, net	181,851	188,603
Other assets	953	1,140
Total assets	572,993	607,689
Current liabilities
Accounts payable and accrued expenses	55,033	64,937
Asset retirement obligation	21,728	22,119
Other current liabilities	1,252	1,367
Total current liabilities	78,013	88,423
Long-term debt	46,000	57,500
Asset retirement obligation	52,115	52,897
Other long-term obligations	6,899	6,417
Total liabilities	183,027	205,237
Commitments and contingencies (Note 8)
Stockholders’ Equity
Common stock, $0.001 par value; 250,000 shares authorized; 35,810 issued and outstanding at March 31, 2020 and 35,772 issued and outstanding at December 31, 2019	36	36
Warrants	88,520	88,520
Additional paid-in capital	1,059,437	1,059,253
Accumulated deficit	(758,027)	(745,357)
Total stockholders’ equity	389,966	402,452
Total liabilities and stockholders’ equity	$ 572,993	$ 607,689