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Summary of Significant Accounting Policies - Summary of Other Current Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Other Current Assets [Line Items]    
Other Current Assets $ 14,839 $ 10,399
Prepaid expenses    
Schedule Of Other Current Assets [Line Items]    
Other Current Assets 1,829 2,005
Advance payments for drilling costs    
Schedule Of Other Current Assets [Line Items]    
Other Current Assets 1,795 0
Production tax refunds receivable    
Schedule Of Other Current Assets [Line Items]    
Other Current Assets 7,915 3,661
Pipe and oil field equipment inventory    
Schedule Of Other Current Assets [Line Items]    
Other Current Assets 3,080 4,503
Other    
Schedule Of Other Current Assets [Line Items]    
Other Current Assets $ 220 $ 230