Nature of Business and Presentation - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Nature Of Business And Presentation [Line Items]
Gain (loss) recorded under reorganization	$ 0
Maturity period of highly liquid investments	three months or less
Capitalized exploratory well costs pending determination of proved reserves	$ 0
Impairment of oil and gas properties	33,413,000	$ 35,570,000
Net operating loss carryforward, wrote off		141,700,000
Liability for material uncertain tax positions	$ 0	0
Option vesting period	3 years
Corporate Headquarter
Nature Of Business And Presentation [Line Items]
Estimated useful lives	30 years
Unproved Oil and Gas Properties
Nature Of Business And Presentation [Line Items]
Impairment of oil and gas properties	$ 28,600,000	4,800,000
Proven Oil and Gas Properties
Nature Of Business And Presentation [Line Items]
Impairment of oil and gas properties	$ 4,800,000	$ 30,800,000
Minimum \| Other Property and Equipment
Nature Of Business And Presentation [Line Items]
Estimated useful lives	3 years
Maximum \| Other Property and Equipment
Nature Of Business And Presentation [Line Items]
Estimated useful lives	5 years
Sales Revenue, Net \| Customer Concentration Risk \| Trafigura AG
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	14.00%	18.00%
Sales Revenue, Net \| Customer Concentration Risk \| BP Products North America LLC
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage		10.00%
Sales Revenue, Net \| Customer Concentration Risk \| Shell Trading (US) Company
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	20.00%	40.00%
Sales Revenue, Net \| Customer Concentration Risk \| Texla Energy Management, Inc
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	16.00%	21.00%
Sales Revenue, Net \| Customer Concentration Risk \| Vitol Inc
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	35.00%
Sales Revenue, Net \| Customer Concentration Risk \| NGL Crude Logistics LLC
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	10.00%
Accounts Receivable \| Customer Concentration Risk \| Trafigura AG
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage		30.00%
Accounts Receivable \| Customer Concentration Risk \| Shell Trading (US) Company
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	19.00%	49.00%
Accounts Receivable \| Customer Concentration Risk \| Texla Energy Management, Inc
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage		13.00%
Accounts Receivable \| Customer Concentration Risk \| Vitol Inc
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	59.00%
Accounts Receivable \| Customer Concentration Risk \| NGL Crude Logistics LLC
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	17.00%

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Nature of business and presentation.

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Net operating loss carryforwards written off.

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Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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Amount recognized for uncertainty in income taxes classified as current.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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