Summary of Significant Accounting Policies - Schedule of Change in Level 3 Assets Measured at Fair Value on Non Recurring Basis (Detail) (Measured at fair value on a nonrecurring basis [Member], USD $)	12 Months Ended
	Dec. 31, 2014
Measured at fair value on a nonrecurring basis [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance - January 1, 2014	$ 2,134,672
Impairment of investment	(1,399,672)
Impairment of deposit	(435,000)
Balance - December 31, 2014	$ 300,000