Assets Held for Sale and Discontinued Operations - Summary of Assets and Liabilities Held for Sale (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets held for sale	$ 1,485
Total noncurrent assets held for sale	8,724
Accrued liabilities	3,500
Total current liabilities associated with assets held for sale	4,568
Total noncurrent liabilities associated with assets held for sale	6,900
Assets Held for Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable	605
Other current assets	880
Total current assets held for sale	1,485
Proved oil and gas properties, net	8,552
Other noncurrent assets	172
Total noncurrent assets held for sale	8,724
Accounts payable	3,489
Accrued liabilities	525
Other current liabilities	554
Total current liabilities associated with assets held for sale	4,568
Asset retirement obligations	6,346
Other liabilities	554
Total noncurrent liabilities associated with assets held for sale	$ 6,900