Fair Value of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative warrant liability, Beginning balance			$ 0
Change in fair value of the derivative warrant liability	$ 0	$ 0	0	$ 28,448
Derivative warrant liability, Ending balance	$ 0		$ 0
Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative warrant liability, Beginning balance				19,932
Change in fair value of the derivative warrant liability				28,448
Reclassification of derivative warrant liability				(48,380)
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative warrant liability, Beginning balance				19,932
Change in fair value of the derivative warrant liability				28,448
Reclassification of derivative warrant liability				$ (48,380)