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Summary of Activity of Level 3 Inputs Measured on Recurring Basis (Detail) - Fair Value, Inputs, Level 3 - USD ($)
 3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period $ 2,811,111 $ 2,586,854
Gain on change in fair value of warrant and conversion feature liability (822,222) 213,718
Balance, as adjusted, end of period 1,988,889 2,800,572
Warrant Liability    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 2,811,111 2,144,496
Gain on change in fair value of warrant and conversion feature liability (822,222) 164,124
Balance, as adjusted, end of period 1,988,889 2,308,620
Conversion Feature Liability    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 0 442,358
Gain on change in fair value of warrant and conversion feature liability 0 49,594
Balance, as adjusted, end of period $ 0 $ 491,952