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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table presents Lonestar's assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2018 and 2017, 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, 2018
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity derivatives
 
$
—

 
$
23,143

 
$
—

 
$
23,143

Liabilities:
 
 
 
 
 
 
 
 
Commodity derivatives
 
—

 
(451
)
 
—

 
(451
)
Warrants
 
—

 
—

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

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

 
$
(1,691
)
 
$
19,734

 
 
 
 
 
 
 
 
 
December 31, 2017
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity derivatives
 
$
—

 
$
472

 
$
—

 
$
472

Liabilities:
 
 
 
 
 
 
 
 
Commodity derivatives
 
—

 
(22,138
)
 
—

 
(22,138
)
Warrants
 
—

 
—

 
(1,471
)
 
(1,471
)
Stock-based compensation
 
—

 
—

 
(314
)
 
(314
)
Total
 
$
—

 
$
(21,666
)
 
$
(1,785
)
 
$
(23,451
)
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 year ended December 31, 2018.
In thousands
 
Warrant
 
Stock-Based Compensation
 
Total
Balance at December 31, 2017
 
$
(1,471
)
 
$
(314
)
 
$
(1,785
)
Unrealized gains (losses)
 
416

 
(322
)
 
94

Balance at December 31, 2018
 
$
(1,055
)
 
$
(636
)
 
$
(1,691
)