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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018, for each fair value hierarchy level:
 
 
Fair Value Measurements Using
In thousands
 
Quoted Prices in Active Markets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
Total
June 30, 2019
 
 
Assets
 
 
 
 
 
 
 
 
Commodity derivatives
 
$
—

 
$
12,600

 
$
—

 
$
12,600

Liabilities:
 
 
 
 
 
 
 
 
Commodity derivatives
 
—

 
(11,902
)
 
—

 
(11,902
)
Warrant
 
—

 
—

 
(361
)
 
(361
)
Stock-based compensation
 
(573
)
 
—

 
(351
)
 
(924
)
Total
 
$
(573
)
 
$
698

 
$
(712
)
 
$
(587
)
 
 
 
 
 
 
 
 
 
December 31, 2018
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity derivatives
 
$
—

 
$
23,143

 
$
—

 
$
23,143

Liabilities:
 
 
 
 
 
 
 
 
Commodity derivatives
 
—

 
(451
)
 
—

 
(451
)
Warrant
 
—

 
—

 
(1,055
)
 
(1,055
)
Stock-based compensation
 
(1,267
)
 
—

 
(636
)
 
(1,903
)
Total
 
$
(1,267
)
 
$
22,692

 
$
(1,691
)
 
$
19,734
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 liabilities for the six months ended June 30, 2019:
In thousands
 
Warrant
 
Stock-Based Compensation
 
Total
Balance as of December 31, 2018
 
$
(1,055
)
 
$
(636
)
 
$
(1,691
)
Unrealized gains
 
694

 
285

 
979

Balance as of June 30, 2019
 
$
(361
)
 
$
(351
)
 
$
(712
)