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Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts Receivable:    
Joint interest billings $ 2,305 $ 3,173
Trade receivables 1,310 941
Oil and gas sales 9,098 12,941
Other 3 4
Accounts Receivable, Gross 12,716 17,059
Less: Allowance for doubtful accounts (98) (98)
Total 12,618 16,961
Accounts Payable:    
Trade 2,815 14,317
Royalty and other owners 5,062 7,073
Partner advances 1,180 1,268
Prepaid drilling deposits 59 67
Other 1,962 1,890
Total 11,078 24,615
Accrued Liabilities:    
Compensation and related expenses 2,370 2,449
Property costs 4,790 9,141
Income tax 4,378 4,180
Other 492 524
Total $ 12,030 $ 16,294