Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts Receivable:
Joint interest billings	$ 2,949	$ 3,173
Trade receivables	1,957	941
Oil and gas sales	8,618	12,941
Other	361	4
Accounts Receivable, Gross	13,885	17,059
Less: Allowance for doubtful accounts	(98)	(98)
Total	13,787	16,961
Accounts Payable:
Trade	3,014	14,317
Royalty and other owners	6,441	7,073
Partner advances	1,161	1,268
Prepaid drilling deposits	103	67
Other	1,854	1,890
Total	12,573	24,615
Accrued Liabilities:
Compensation and related expenses	2,165	2,449
Property costs	6,605	9,141
Income tax		4,180
Other	404	524
Total	$ 9,174	$ 16,294

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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