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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis The following tables set forth by level within the fair value hierarchy the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis:
 Fair value at December 31, 2019
 Level 1Level 2Level 3Total
 (In thousands)
Assets:
Money market funds$146  $—  $—  $146  
Commodity derivative instruments (see Note 8)—  1,174  —  1,174  
Total assets$146  $1,174  $—  $1,320  
Liabilities:
Commodity derivative instruments (see Note 8)$—  $19,815  $—  $19,815  
Total liabilities$—  $19,815  $—  $19,815  
 Fair value at December 31, 2018
 Level 1Level 2Level 3Total
 (In thousands)
Assets:
Money market funds$143  $—  $—  $143  
Commodity derivative instruments (see Note 8)—  106,875  —  106,875  
Total assets$143  $106,875  $—  $107,018  
Liabilities:
Commodity derivative instruments (see Note 8)$—  $104  $—  $104  
Total liabilities$—  $104  $—  $104