Basis of Presentation - Components of Liabilities Subject to Compromise (Details) - USD ($) $ in Thousands	Oct. 01, 2020	Sep. 30, 2020
Debt Instrument [Line Items]
Accounts payable		$ 5,892
Accounts payable — related parties		139
Oil, natural gas liquid and natural gas sales		20,361
Accrued liabilities		29,229
Current maturities of long-term debt		252,157
Long-term debt		260
Equity warrant liability — related parties		1
Other non-current liabilities		1,154
Total liabilities subject to compromise	$ 250,000	$ 309,193
Liabilities subject to compromise, accrued interest	$ 21,100