Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2015

Summary Of Significant Accounting Policies [Line Items]

Major Components of Property and Equipment

	As of September 30,		As of December 31,
	2015		2014
	(in thousands)
Unproved property costs - Dussafu PSC	$	51,029	$	50,324
Oilfield inventories		3,426		3,966
Other administrative property		2,777		2,670
Total property and equipment		57,232		56,960
Accumulated depreciation		(2,466)		(2,453)
Total property and equipment, net	$	54,766	$	54,507

Schedule of Other Assets

	As of September 30,		As of December 31,
	2015		2014
	(in thousands)
Deposits and long-term prepaid expenses	$	143	$	101
Deferred financing costs		—		283
Gabon – blocked payment		550		1,100
	$	693	$	1,484

Schedule of Estimated Fair Values

	As of September 30, 2015
	Level 1		Level 2		Level 3		Total
	(in thousands)
Recurring
Assets:
Embedded derivative asset	$	—	$	—	$	3,481	$	3,481
	$	—	$	—	$	3,481	$	3,481
Liabilities:
Stock appreciation rights liability	$	—	$	414	$	312	$	726
Restricted stock units liability		—		393		137		530
Warrant derivative liability		—		—		27,613		27,613
	$	—	$	807	$	28,062	$	28,869

	As of December 31, 2014
	Level 1		Level 2		Level 3		Total
	(in thousands)
Recurring
Liabilities:
Stock appreciation rights liability	$	—	$	356	$	—	$	356
Restricted stock units liability		—		652		—		652
	$	—	$	1,008	$	—	$	1,008

Reconciliation of Financial Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(in thousands)
Financial assets -  embedded derivative asset
Beginning balance	$	2,627	$	—	$	—	$	—
Additions - fair value at issuance		—		—		2,504		—
Change in fair value		854		—		977		—
Ending balance	$	3,481	$	—	$	3,481	$	—

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(in thousands)
Financial liabilities -  embedded derivative liability
Beginning balance	$	13,015	$	—	$	—	$	—
Additions - fair value at issuance		—		—		13,449		—
Change in fair value		(1,873)		—		(2,307)		—
Conversion of debt		(11,142)		—		(11,142)		—
Ending balance	$	—	$	—	$	—	$	—

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(in thousands)
Financial liabilities -  warrant derivative liabilities:
Beginning balance	$	37,595	$	1,953	$	—	$	1,953
Additions - fair value at issuance		—		—		40,013		—
Change in fair value		(9,982)		—		(12,400)		—
Ending balance	$	27,613	$	1,953	$	27,613	$	1,953

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(in thousands)
Financial liabilities -  stock appreciation rights
Beginning balance	$	—	$	—	$	—	$	—
Additions - fair value at issuance		—		—		—		—
Change in fair value		312		—		312		—
Ending balance	$	312	$	—	$	312	$	—

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(in thousands)
Financial liabilities - restricted stock units
Beginning balance	$	—	$	—	$	—	$	—
Additions - fair value at issuance		—		—		—		—
Change in fair value		137		—		137		—
Ending balance	$	137	$	—	$	137	$	—

Schedule of Changes in Noncontrolling Interests

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(in thousands)
Balance at beginning of period	$	78,701	$	260,150	$	79,152	$	243,167
Contributions by noncontrolling interest owners		380		236		543		953
Net income (loss) attributable to noncontrolling interests		(294)		(273)		(908)		15,993
Balance at end of period	$	78,787	$	260,113	$	78,787	$	260,113

Stock Appreciation Rights [Member]

Summary Of Significant Accounting Policies [Line Items]

Schedule of Fair Value Assumptions

	Fair Value
	Hierarchy	As of September 30,
	Level	2015
Significant assumptions (or ranges):
Stock price	Level 1 input	$	1.39
Exercise price	Level 1 input	$	1.13
Threshold price	Level 1 input	$	2.50
Term (years)			4.81
Volatility	Level 2 input		100.0	%
Risk-free rate	Level 1 input		1.33	%
Dividend yield	Level 2 input		0.0	%

Restricted Stock Units [Member]

Summary Of Significant Accounting Policies [Line Items]

Schedule of Fair Value Assumptions

	Fair Value
	Hierarchy	As of September 30,
	Level	2015
Significant assumptions (or ranges):
Stock price	Level 1 input	$	1.39
Threshold price	Level 1 input	$	2.50
Term (years)			10.0
Volatility	Level 2 input		80.0	%
Risk-free rate	Level 1 input		2.06	%
Dividend yield	Level 2 input		0.0	%