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Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts Receivable:
Joint interest billing	$ 2,680	$ 2,882
Trade receivables	1,878	1,980
Oil and gas sales	5,415	6,245
Other	2,135	1,751
Accounts Receivable, Gross	12,108	12,858
Less: Allowance for doubtful accounts	(469)	(543)
Total	11,639	12,315
Accounts Payable:
Trade	1,067	3,995
Royalty and other owners	6,820	8,444
Partner advances	1,774	1,344
Prepaid drilling deposits		786
Other	1,416	1,689
Total	11,077	16,258
Accrued Liabilities:
Compensation and related expenses	2,557	2,350
Property costs	4,319	9,204
Income tax	295	554
Other	629	293
Total	$ 7,800	$ 12,401

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