Nature of Business and Presentation - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Nature Of Business And Presentation [Line Items]
Gain (loss) recorded under reorganization	$ 0
Maturity period of highly liquid investments	three months or less
Allowance for uncollectible amount	$ 196,000
Material credit loss	0
Impairment of oil and gas properties	33,893,000	$ 28,623,000
Net operating loss carryforward, wrote off	141,700,000
Liability for material uncertain tax positions	$ 0	0
Option vesting period	3 years
Unproved Oil and Gas Properties
Nature Of Business And Presentation [Line Items]
Impairment of oil and gas properties	$ 4,800,000	8,900,000
Proven Oil and Gas Properties
Nature Of Business And Presentation [Line Items]
Impairment of oil and gas properties	$ 29,100,000	$ 19,700,000
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	18.00%	38.00%
Sales Revenue, Net \| Customer Concentration Risk \| BP Products North America LLC
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	10.00%	20.00%
Sales Revenue, Net \| Customer Concentration Risk \| Shell Trading (US) Company
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	40.00%	16.00%
Sales Revenue, Net \| Customer Concentration Risk \| Texla Energy Management, Inc
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	21.00%	11.00%
Accounts Receivable \| Customer Concentration Risk \| Trafigura AG
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	30.00%	25.00%
Accounts Receivable \| Customer Concentration Risk \| Shell Trading (US) Company
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	49.00%	26.00%
Accounts Receivable \| Customer Concentration Risk \| Texla Energy Management, Inc
Nature Of Business And Presentation [Line Items]
Concentration risk, percentage	13.00%	23.00%

Gain (loss) recorded under reorganization.

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Maturity period of highly liquid investments.

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Nature of business and presentation.

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No definition available.

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- Definition

Net operating loss carryforwards written off.

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No definition available.

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
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- Definition

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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- Definition

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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-Publisher FASB
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Amount recognized for uncertainty in income taxes classified as current.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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-Publisher FASB
-Name Accounting Standards Codification
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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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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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