Significant Accounting Policies [Line Items]

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 35
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

Amount recognized for uncertainty in income taxes classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Impairment of oil and gas properties	$ 29,144,000	$ 31,082,000	$ 28,622,961	$ 5,478,264
Deferred tax asset valuation allowance			0	0
Liability for material uncertain tax positions			$ 0	0
Option vesting period		3 years	3 years
Employee Stock Option
Significant Accounting Policies [Line Items]
Option vesting period			3 years
Unproved Oil And Gas Properties
Significant Accounting Policies [Line Items]
Impairment of oil and gas properties			$ 8,927,000
Proven Oil And Gas Properties
Significant Accounting Policies [Line Items]
Impairment of oil and gas properties			$ 19,696,000	$ 5,478,000
Minimum \| Other property and equipment
Significant Accounting Policies [Line Items]
Estimated useful lives			3 years
Maximum \| Other property and equipment
Significant Accounting Policies [Line Items]
Estimated useful lives			5 years
Sales Revenue, Net \| Customer Concentration Risk \| Trafigura AG
Significant Accounting Policies [Line Items]
Concentration risk, percentage			38.00%	23.00%
Sales Revenue, Net \| Customer Concentration Risk \| BP Products North America LLC
Significant Accounting Policies [Line Items]
Concentration risk, percentage			20.00%	16.00%
Sales Revenue, Net \| Customer Concentration Risk \| Shell Trading (US) Company
Significant Accounting Policies [Line Items]
Concentration risk, percentage			16.00%	36.00%
Sales Revenue, Net \| Customer Concentration Risk \| Texla Energy Management, Inc
Significant Accounting Policies [Line Items]
Concentration risk, percentage			11.00%
Accounts Receivable \| Customer Concentration Risk \| Trafigura AG
Significant Accounting Policies [Line Items]
Concentration risk, percentage			25.00%	27.00%
Accounts Receivable \| Customer Concentration Risk \| BP Products North America LLC
Significant Accounting Policies [Line Items]
Concentration risk, percentage				32.00%
Accounts Receivable \| Customer Concentration Risk \| Shell Trading (US) Company
Significant Accounting Policies [Line Items]
Concentration risk, percentage			26.00%	19.00%
Accounts Receivable \| Customer Concentration Risk \| Texla Energy Management, Inc
Significant Accounting Policies [Line Items]
Concentration risk, percentage			23.00%