Stockholders' Equity - Summary of Stock Option Activity (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, Beginning balance	9,614,627
Granted, Options Outstanding	1,955,016
Canceled, Options Outstanding	(368,171)
Exercised, Options Outstanding	(245,271)	(116,001)	(205,684)
Options Outstanding, Ending balance	10,956,201	9,614,627
Vested and Exercisable, Options Outstanding	7,054,815
Weighted-Average Exercise Price, Options Beginning balance	$ 4.79
Options granted, Weighted-Average Exercise Price	3.79
Options canceled, Weighted-Average Exercise Price	5.64
Options exercised, Weighted-Average Exercise Price	2.38
Weighted-Average Exercise Price, Options Ending balance	4.63	$ 4.79
Vested and Exercisable, Weighted-Average Exercise Price	$ 4.64
Aggregate Intrinsic Value, Options	$ 4,876,437	$ 1,927,137
Options Exercised, Aggregate Intrinsic Value	356,616
Vested and Exercisable, Aggregate Intrinsic Value	$ 4,380,611