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Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts Receivable:
Joint interest billings	$ 2,667	$ 2,882
Trade receivables	1,452	1,980
Oil and gas sales	3,576	6,245
Other	2,377	1,751
Accounts Receivable, Gross	10,072	12,858
Less: Allowance for doubtful accounts	(529)	(543)
Total	9,543	12,315
Accounts Payable:
Trade	3,289	3,995
Royalty and other owners	5,973	8,444
Partner advances	1,083	1,344
Prepaid drilling deposits	390	786
Other	1,620	1,689
Total	12,355	16,258
Accrued Liabilities:
Compensation and related expenses	2,294	2,350
Property costs	3,302	9,204
Income tax		554
Other	526	293
Total	$ 6,122	$ 12,401

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