Stockholders' Equity - Summary of Stock Option Activity (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, Beginning balance	12,039,264
Granted, Options Outstanding	342,500
Canceled, Options Outstanding	(4,743,688)
Exercised, Options Outstanding	0	(622,192)
Options Outstanding, Ending balance	7,638,076	12,039,264
Vested and Exercisable, Options Outstanding	4,184,674
Weighted-Average Exercise Price, Options Beginning balance	$ 2.24
Options granted, Weighted-Average Exercise Price	0.32
Options canceled, Weighted-Average Exercise Price	2.35
Weighted-Average Exercise Price, Options Ending balance	2.08	$ 2.24
Vested and Exercisable, Weighted-Average Exercise Price	$ 2.53
Aggregate Intrinsic Value, Options Beginning balance	$ 0
Options Exercised, Aggregate Intrinsic Value	0
Aggregate Intrinsic Value, Options Ending balance	37,440	$ 0
Vested and Exercisable, Aggregate Intrinsic Value	$ 0