Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

The following tables present the Company’s assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2017 and 2016, for each fair value hierarchy level:

	Fair Value Measurements Using
In thousands	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)			Total
December 31, 2017
Assets:
Commodity derivatives	$	—	$	472		$	—		$	472
Liabilities:
Commodity derivatives		—		(22,138	)		—			(22,138	)
Equity warrant liability		—		—			(508	)		(508	)
Equity warrant liability - related parties		—		—			(963	)		(963	)
Stock appreciation rights		—		—			(314	)		(314	)
Total	$	—	$	(21,666	)	$	(1,785	)	$	(23,451	)
December 31, 2016
Assets:
Commodity derivatives	$	—	$	1,730		$	—		$	1,730
Liabilities:
Commodity derivatives		—		(4,110	)		—			(4,110	)
Equity warrant liability		—		—			(1,565	)		(1,565	)
Equity warrant liability - related parties		—		—			(2,994	)		(2,994	)
Total	$	—	$	(2,380	)	$	(4,559	)	$	(6,939	)

Summary of Changes in Fair Value for the Level 3 Liabilities

The table below sets forth a summary of changes in the fair value of the Company’s Level 3 liability for the year ended December 31, 2017.

In thousands	Equity Warrant Liability			Stock Appreciation Rights			Total
Balance at December 31, 2016	$	(4,559	)	$	—		$	(4,559	)
Purchases, sales, issuances and settlements (net)		—			(72	)		(72	)
Unrealized gains/(losses)		3,088			(242	)		2,846
Balance at December 31, 2017	$	(1,471	)	$	(314	)	$	(1,785	)