Stockholders' Equity - Summary of Warrant Activity (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding, Beginning balance			10,956,201
Granted, Options Outstanding			2,370,168
Exercised, Options Outstanding	0	(39,005)	(500,000)	(245,271)
Options Outstanding, Ending balance	11,432,152		11,432,152
Weighted-Average Exercise Price, Options Beginning balance			$ 4.63
Granted, Weighted-Average Exercise Price			2.64
Exercised, Weighted-Average Exercise Price			1.65
Weighted-Average Exercise Price, Options Ending balance	$ 4.30		$ 4.30
Warrants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding, Beginning balance			221,370
Granted, Options Outstanding			0
Exercised, Options Outstanding			0
Cancelled, Options Outstanding			(1,370)
Options Outstanding, Ending balance	220,000		220,000
Weighted-Average Exercise Price, Options Beginning balance			$ 7.16
Granted, Weighted-Average Exercise Price			0
Exercised, Weighted-Average Exercise Price			0
Cancelled, Weighted-Average Exercise Price			2.28
Weighted-Average Exercise Price, Options Ending balance	$ 7.19		$ 7.19