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Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable:
Joint interest billings	$ 1,976	$ 3,173
Trade receivables	1,979	941
Oil and gas sales	6,112	12,941
Tax refund receivable	4,760
Other	358	4
Accounts Receivable, Gross	15,185	17,059
Less: Allowance for doubtful accounts	(224)	(98)
Total	14,961	16,961
Accounts Payable:
Trade	1,174	14,317
Royalty and other owners	6,197	7,073
Partner advances	1,143	1,268
Prepaid drilling deposits	214	67
Other	825	1,890
Total	9,553	24,615
Accrued Liabilities:
Compensation and related expenses	2,907	2,449
Property costs	14,993	9,141
Income tax		4,180
Other	531	524
Total	$ 18,431	$ 16,294

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