Derivative and Hedging Financial Instruments - Summary of Realized and Unrealized Gains and Losses Related to Derivative Instrument (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gain (Loss) on Investments [Abstract]
Realized gains (loss) on commodity derivative	$ 2,108,934	$ 530,150	$ 14,238,371	$ 80,103
Change in fair value of commodity derivative	813,129	2,432,946	(4,468,047)	(142,636)
Change in fair value of warrant derivative liability	0	0	0	0
Total realized and unrealized gains (loss) recorded	$ 2,922,063	$ 2,963,096	$ 9,770,324	$ (62,533)