Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (29,434,000)	$ 1,580,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Impairment of proved and unproved oil and gas properties	46,878,000	0
Depreciation, depletion and amortization	96,414,000	69,243,000
Accretion of asset retirement obligation	307,000	214,000
Impairment of goodwill	17,620,000	0
Gain on sale of oil and gas properties, net	(204,000)	(3,222,000)
Settlement of asset retirement obligations	(195,000)	(374,000)
Total (gain) loss on derivative contracts, net	(59,899,000)	43,983,000
Operating portion of net cash received in settlement of derivative contracts	56,044,000	15,866,000
Stock-based compensation	10,054,000	8,648,000
Deferred income taxes	(657,000)	1,665,000
Write-off of deferred financing costs	0	1,242,000
Amortization of deferred financing costs	322,000	412,000
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	11,914,000	(18,035,000)
(Increase) decrease in prepaid expenses and other current assets	(203,000)	66,000
Increase (decrease) in accounts payable and accrued expenses	481,000	(10,438,000)
Increase (decrease) in revenues and royalties payable	(8,323,000)	7,067,000
Increase (decrease) in advances	(9,617,000)	8,331,000
Net cash provided by operating activities	131,502,000	126,248,000
Cash flows from investing activities:
Additions to oil and gas properties	(88,097,000)	(204,268,000)
Additions to office and other equipment	(114,000)	(527,000)
Proceeds from sale of oil and gas properties	414,000	4,184,000
Net cash used in investing activities	(87,797,000)	(200,611,000)
Cash flows from financing activities:
Proceeds from borrowings	136,056,000	234,680,000
Repayments of borrowings	(191,056,000)	(143,508,000)
Cash paid related to the exchange and cancellation of Class A Common Stock	(836,000)	(1,135,000)
Cash paid for finance leases	(130,000)	(392,000)
Deferred financing costs	(67,000)	(1,836,000)
Net cash (used in) provided by financing activities	(56,033,000)	87,809,000
Net increase (decrease) in cash	(12,328,000)	13,446,000
Cash at beginning of period	13,822,000	376,000
Cash at end of period	1,494,000	13,822,000
Cash paid for:
Interest	4,588,000	6,405,000
Non-cash investing and financing activities:
Accrued capital expenditures	7,328,000	28,356,000
Lease asset additions - ASC 842	0	3,722,000
Asset retirement obligations	$ 762,000	$ 105,000