Stockholders' Equity - Summary of Warrant Activity (Detail) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding, Beginning balance	5,935,888	3,618,567
Granted, Options Outstanding	1,429,191	2,519,572
Expired / Canceled, Options Outstanding	45,847	18,455
Exercised, Options Outstanding	(205,684)	(183,796)
Options Outstanding, Ending balance	7,113,548	5,935,888
Weighted-Average Exercise Price, Options Beginning balance	$ 4.87	$ 2.11
Granted, Weighted-Average Exercise Price	$ 6.18	$ 8.63
Options canceled, Weighted-Average Exercise Price	$ 7.17	$ 3.31
Exercised, Weighted-Average Exercise Price	$ 1.73	$ 2.19
Weighted-Average Exercise Price, Options Ending balance	$ 5.21	$ 4.87
Warrants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding, Beginning balance	1,194,756	4,283,889
Granted, Options Outstanding	195,000	112,500
Expired / Canceled, Options Outstanding	0	0
Exercised, Options Outstanding	(211,647)	(3,201,633)
Options Outstanding, Ending balance	1,178,109	1,194,756
Weighted-Average Exercise Price, Options Beginning balance	$ 1.79	$ 1.17
Granted, Weighted-Average Exercise Price	$ 7.04	$ 7.36
Options canceled, Weighted-Average Exercise Price	$ 0	$ 0
Exercised, Weighted-Average Exercise Price	$ 2.14	$ 1.16
Weighted-Average Exercise Price, Options Ending balance	$ 2.59	$ 1.79