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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Summary of Fair Value Hierarchy for Financial Assets The fair value hierarchy for our financial assets and liabilities accounted for at fair value on a recurring basis at September 30, 2018 and December 31, 2017 was as follows (in thousands):
 
 
As of September 30, 2018
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Liabilities
 
 
 
 
 
 
 


Commodity derivatives
 
—

 
(126
)
 
—

 
(126
)
Net liabilities
 
$
—

 
$
(126
)
 
$
—

 
$
(126
)
 
 
As of December 31, 2017
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Liabilities
 
 
 
 
 
 
 
 
Commodity derivatives
 
—

 
(1,087
)
 
—

 
(1,087
)
Net liabilities
 
$
—

 
$
(1,087
)
 
$
—

 
$
(1,087
)