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)

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Fair Value of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Jun. 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 $ 29,966   $ 28,448
Derivative warrant liability, Ending balance   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)