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Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts Receivable:    
Joint interest billing $ 2,443 $ 2,345
Trade receivables 1,399 1,070
Oil and gas sales 5,734 4,078
Other 373 204
Accounts Receivable, Gross 9,949 7,697
Less: Allowance for doubtful accounts (297) (297)
Total 9,652 7,400
Accounts Payable:    
Trade 1,372 3,967
Royalty and other owners 7,155 5,317
Prepaid drilling deposits 51 83
Other 740 1,414
Total 9,318 11,965
Accrued Liabilities:    
Compensation and related expenses 2,568 2,295
Property costs 14,098 3,317
Income Tax 5,873 1,988
Other 405 584
Total $ 22,944 $ 8,184