Stockholders' Equity - Summary of Stock Option Activity (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, Beginning balance			10,956,201
Granted, Options Outstanding			2,370,168
Cancelled / forfeited, Options Outstanding			(1,394,217)
Exercised, Options Outstanding	0	(39,005)	(500,000)	(245,271)
Options Outstanding, Ending balance	11,432,152		11,432,152
Vested and Exercisable, Options Outstanding	7,177,206		7,177,206
Weighted-Average Exercise Price, Options Beginning balance			$ 4.63
Options granted, Weighted-Average Exercise Price			2.64
Options cancelled / forfeited, Weighted-Average Exercise Price			5.07
Options exercised, Weighted-Average Exercise Price			1.65
Weighted-Average Exercise Price, Options Ending balance	$ 4.30		4.30
Vested and Exercisable, Weighted-Average Exercise Price	$ 4.88		$ 4.88
Aggregate Intrinsic Value, Options Beginning balance			$ 4,876,437
Options Exercised, Aggregate Intrinsic Value			235,000
Aggregate Intrinsic Value, Options	$ 783,962		783,962
Vested and Exercisable, Aggregate Intrinsic Value	$ 783,962		$ 783,962