Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts Receivable:
Joint interest billings	$ 1,873	$ 3,173
Trade receivables	2,207	941
Oil and gas sales	10,456	12,941
Other	361	4
Accounts Receivable, Gross	14,897	17,059
Less: Allowance for doubtful accounts	(98)	(98)
Total	14,799	16,961
Accounts Payable:
Trade	1,153	14,317
Royalty and other owners	7,944	8,341
Prepaid drilling deposits	114	67
Other	1,404	1,890
Total	10,615	24,615
Accrued Liabilities:
Compensation and related expenses	2,387	2,449
Property costs	12,092	9,141
Income tax		4,180
Other	785	524
Total	$ 15,264	$ 16,294

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