Provision for Taxes - Net Deferred Tax Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
NOL carryover	$ 31,967,000	$ 21,625,000
AMT credit	606,000	606,000
Accruals	476,000	1,020,000
Other	14,000	31,000
Total deferred tax assets	33,063,000	23,282,000
Deferred tax liabilities:
Depreciation, depletion and amortization	(8,748,000)	(4,884,000)
Unrealized gain on derivative contract	(1,399,000)	(2,798,000)
Total deferred tax liabilities	(10,147,000)	(7,682,000)
Valuation allowance	(22,916,000)	(15,600,000)
Net deferred taxes	$ 0	$ 0