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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

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- Definition Amount of current assets classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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