Consolidated Statements of Changes in Stockholders’ Equity (Deficit) - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-In Capital	Treasury Shares	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2017		53,368,331		0
Beginning balance at Dec. 31, 2017	$ (30,948)	$ 5	$ 272,335	$ 0	$ (303,288)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	9,000		9,000
Common stock for restricted stock (in shares)		404,093
Common stock for restricted stock	0
Common stock withheld for taxes on stock-based compensation (in shares)		(484,727)
Common stock withheld for taxes on stock-based compensation	(2,230)		(2,230)
Common stock for acquisition of oil and natural gas properties (in shares)		6,940,722
Common stock for acquisition of oil and natural gas properties	24,778	$ 1	24,777
Exercise of warrants and stock options (in shares)		5,000,834
Exercise of warrants and stock options	3,751		3,751
Common stock issued for extinguishment of debt (in shares)		5,952,763
Common stock issued for extinguishment of debt	24,585	$ 1	24,584
Reclassification of warrant derivative liabilities	223		223
Purchase of treasury stock (in shares)				(253,598)
Purchase of treasury stock	(997)			$ (997)
Dividends on preferred stock	(10,687)		(10,687)
Net loss	(4,143)				(4,143)
Ending balance (in shares) at Dec. 31, 2018		71,182,016		(253,598)
Ending balance at Dec. 31, 2018	13,332	$ 7	321,753	$ (997)	(307,431)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	6,506		6,506
Common stock for restricted stock (in shares)		3,178,448
Common stock for restricted stock	0
Common stock withheld for taxes on stock-based compensation (in shares)		(417,642)
Common stock withheld for taxes on stock-based compensation	(546)		(546)
Common stock for acquisition of oil and natural gas properties	0
Common stock issued for extinguishment of debt (in shares)		17,641,638
Common stock issued for extinguishment of debt	32,990	$ 2	32,988
Gain on extinguishment of debt	7,078		7,078
Dividends on preferred stock	(25,397)		(25,397)
Net loss	(272,121)				(272,121)
Ending balance (in shares) at Dec. 31, 2019		91,584,460		(253,598)
Ending balance at Dec. 31, 2019	$ (238,158)	$ 9	$ 342,382	$ (997)	$ (579,552)