Fresh-Start Accounting - Adjustments Detail (Details) $ in Thousands	Nov. 30, 2020 USD ($)
Liabilities Subject to Compromise:
Total liabilities subject to compromise	$ (271,110)
Fresh-Start Adjustment, Postconfirmation, Property and Equipment [Abstract]
Property and equipment	313,972
Oil and gas properties, unproved properties	34,925
Other property and equipment	19,674
Postconfirmation, Property and Equipment, Gross	368,571
Postconfirmation, Accumulated Depreciation and Amortization	0
Property and equipment, net	368,571
Fresh-Start Adjustment, Preconfirmation, Property and Equipment [Abstract]
Oil and gas properties, proved properties	1,100,211
Oil and gas properties, unproved properties	77,382
Other property and equipment	21,862
Preconfirmation, Property and Equipment, Gross	1,199,455
Less accumulated depreciation, depletion, amortization and impairment	(734,231)
Property and equipment, net	465,224
Reorganization Adjustments
Net change in cash and cash equivalents:
Payment of Predecessor Senior Secured Credit Facility interest and fees	(764)
Payment of deferred financing fees for the Successor Senior Secured Credit Facility and Successor Second-Out Term Loan	(4,710)
Payment to fund professional fee escrow	(6,815)
Payment of professional fees including success fees	(3,373)
Payment of bank fees	(90)
Cash and cash equivalents	(30,752)
Net change in other non-current assets:
Payment of deferred financing fees for the Senior Secured Credit Facility and Successor Second Out Term Loan	4,710
Elimination of deferred financing fees on the Predecessor Senior Secured Credit Facility	(172)
Other non-current assets	4,538
Net change in other current liabilities:
Accrual of professional fees (success fees)	4,715
Payment of Predecessor Senior Secured Credit Facility interest and fees	(764)
Net change in other current liabilities	3,951
Net change in current maturities of long-term debt:
Net change in current maturities of long-term debt	(264,602)
Net change in long-term debt includes the following :
Net change in long-term debt	249,602
Liabilities Subject to Compromise:
11.25% Senior Notes	(250,000)
Interest on 11.25% Senior Notes	(21,094)
Stock compensation liability	(15)
Acceleration of unvested predecessor stock compensation on the Effective Date	(21)
Predecessor warrant liability	(1)
Total liabilities subject to compromise	(271,131)
Less: Distribution of Successor ordinary shares to creditors	88,199
Less: Distribution of Successor warrants to creditors	1,089
Gain on settlement of liabilities subject to compromise	(181,843)
Net Change in Accumulated Deficit:
Gain on settlement of liabilities subject to compromise	181,843
Acceleration of Predecessor stock compensation awards	(21)
Accrual of professional fees (success fee)	(4,715)
Payment of professional fees (success fee)	(1,375)
Elimination of deferred financing fees on the Predecessor Senior Secured Credit Facility	(172)
Payment of bank fees	(90)
Net Change in Accumulated Deficit	175,470
Reorganization Adjustments | Senior Secured Credit Facility | Line of Credit
Net change in cash and cash equivalents:
Proceeds from debt	224,602
Reorganization Adjustments | Second-Out Senior Secured Term Loan | Secured Debt
Net change in cash and cash equivalents:
Proceeds from debt	60,000
Net change in current maturities of long-term debt:
Proceeds from Successor Second-Out Term Loan (current portion)	20,000
Net change in long-term debt includes the following :
Borrowings of debt	40,000
Reorganization Adjustments | Predecessor Senior Secured Credit Facility | Line of Credit
Net change in cash and cash equivalents:
Repayments of debt	(284,602)
Net change in current maturities of long-term debt:
Payment of Predecessor Senior Secured Credit Facility	(284,602)
Reorganization Adjustments | Successor Senior Secured Credit Facility | Line of Credit
Net change in cash and cash equivalents:
Repayments of debt	(15,000)
Net change in long-term debt includes the following :
Borrowings of debt	224,602
Payment of Successor Senior Secured Credit Facility	(15,000)
Reorganization Adjustments - Predecessor
Additional paid in capital:
Cancellation of Predecessor ordinary and preferred shares	142,655
Total Successor additional paid in capital	138,980
Reorganization Adjustments - Predecessor | Predecessor Preferred Shareholders
Additional paid in capital:
Issuance of shares	(2,756)
Reorganization Adjustments - Predecessor | Predecessor Ordinary Shareholders
Additional paid in capital:
Issuance of shares	(919)
Reorganization Adjustments - Successor
Additional paid in capital:
Issuance of Successor warrant to holders of the Predecessor Senior Secured Credit Facility	1,089
Total Successor additional paid in capital	92,953
Reorganization Adjustments - Successor | Creditors
Additional paid in capital:
Issuance of shares	88,189
Reorganization Adjustments - Successor | Predecessor Preferred Shareholders
Additional paid in capital:
Issuance of shares	2,756
Reorganization Adjustments - Successor | Predecessor Ordinary Shareholders
Additional paid in capital:
Issuance of shares	919
Fresh Start Adjustments
Net change in long-term debt includes the following :
Net change in long-term debt	(402)
Additional paid in capital:
Total Successor additional paid in capital	(314,992)
Net Change in Accumulated Deficit:
Fresh start valuation adjustments	(93,282)
Elimination of Predecessor Accumulated Deficit to Additional Paid In Capital	314,992
Net Change in Accumulated Deficit	$ 221,710