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Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts Receivable:    
Joint interest billings $ 3,173 $ 2,345
Trade receivables 941 1,070
Oil and gas sales 12,941 4,078
Other 4 204
Accounts Receivable, Gross 17,059 7,697
Less: Allowance for doubtful accounts (98) (297)
Total 16,961 7,400
Accounts Payable:    
Trade 14,317 3,967
Royalty and other owners 7,073 5,909
Partner advances 1,268 592
Prepaid drilling deposits 67 83
Other 1,890 1,414
Total 24,615 11,965
Accrued Liabilities:    
Compensation and related expenses 2,449 2,295
Property costs 9,141 3,317
Income tax 4,180 1,988
Other 524 584
Total $ 16,294 $ 8,184