Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jul. 01, 2020	Dec. 31, 2019	Jan. 31, 2018
Debt Instrument [Line Items]
Accrued interest – 11.25% Senior Notes	$ 21,094	$ 14,100	$ 14,063
Accrued well costs	368		8,932
Bonus payable	1,827		2,353
Other	6,368		1,557
Total accrued liabilities, prior to reclassification to liabilities subject to compromise	29,657		26,905
Less amounts reclassified to liabilities subject to compromise	(29,228)		0
Total accrued liabilities	$ 429		$ 26,905
11.25% Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)	11.25%			11.25%