Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)

v3.3.0.814
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)