Summary of Significant Accounting Policies - Summary of Gross and Net Amounts of Offsetting Liabilities (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Offsetting [Abstract]
Gross Amounts of Recognized Liabilities	$ (23,171,081)	$ (13,474,175)
Gross Amount Offset Liabilities in the Statement of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Condition	(23,171,081)	(13,474,175)
Gross Amounts Not Offset in the Statement of Financial Condition - Financial Instruments Liabilities	23,171,081
Gross Amounts Not Offset in the Statement of Financial Condition - Cash Collateral Pledged Liabilities		13,474,175
Liabilities Net Amount	$ (23,171,081)	$ (13,474,175)