Stockholders' Equity - Summary of Stock Option Activity (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, Beginning balance	10,132,312
Granted, Options Outstanding	8,024,194
Canceled, Options Outstanding	(5,495,050)
Exercised, Options Outstanding	(622,192)	(500,000)
Options Outstanding, Ending balance	12,039,264	10,132,312
Vested and Exercisable, Options Outstanding	3,810,831
Weighted-Average Exercise Price, Options Beginning balance	$ 4.01
Options granted, Weighted-Average Exercise Price	1.29
Options canceled, Weighted-Average Exercise Price	4.37
Options exercised, Weighted-Average Exercise Price	0.08
Weighted-Average Exercise Price, Options Ending balance	2.24	$ 4.01
Vested and Exercisable, Weighted-Average Exercise Price	$ 3.68
Aggregate Intrinsic Value, Options Beginning balance	$ 591,082
Options Exercised, Aggregate Intrinsic Value	561,591
Aggregate Intrinsic Value, Options Ending balance	0	$ 591,082
Vested and Exercisable, Aggregate Intrinsic Value	$ 0