Summary of Activity of Level 3 Inputs Measured on Recurring Basis (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Reclassification to equity			$ 1,177,778	$ 0
Fair value of warrant-NMM			2,922,222
Fair Value, Inputs, Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 1,477,778	$ 1,703,996	2,811,111	2,586,854
Reclassification to equity	(1,177,778)		(1,177,778)
Fair value of warrant-NMM		2,922,222		2,922,222
Change in fair value of warrant and conversion feature liability	(300,000)	(430,396)	(1,633,333)	(313,530)
Conversion of warrants and convertible note - NNA		(2,106,933)		(2,106,933)
Warrant out of period correction, as adjusted		0		(999,724)
Balance, end of period	0	2,088,889	0	2,088,889
Fair Value, Inputs, Level 3 | Warrant Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	1,477,778	1,315,846	2,811,111	2,144,496
Reclassification to equity	(1,177,778)		(1,177,778)
Fair value of warrant-NMM		2,922,222		2,922,222
Change in fair value of warrant and conversion feature liability	(300,000)	(525,150)	(1,633,333)	(354,076)
Conversion of warrants and convertible note - NNA		(1,624,029)		(1,624,029)
Warrant out of period correction, as adjusted		0		(999,724)
Balance, end of period	0	2,088,889	0	2,088,889
Fair Value, Inputs, Level 3 | Conversion Feature Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	0	388,150	0	442,358
Reclassification to equity	0		0
Fair value of warrant-NMM		0		0
Change in fair value of warrant and conversion feature liability	0	94,754	0	40,546
Conversion of warrants and convertible note - NNA		(482,904)		(482,904)
Warrant out of period correction, as adjusted		0		0
Balance, end of period	$ 0	$ 0	$ 0	$ 0