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Stockholders' Equity - Summary of Warrant Activity (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding, Beginning balance	9,614,627
Granted, Options Outstanding	1,955,016
Expired / Canceled, Options Outstanding	(368,171)
Exercised, Options Outstanding	(245,271)	(116,001)	(205,684)
Options Outstanding, Ending balance	10,956,201	9,614,627
Weighted-Average Exercise Price, Options Beginning balance	$ 4.79
Granted, Weighted-Average Exercise Price	3.79
Expired / Canceled, Weighted-Average Exercise Price	5.64
Exercised, Weighted-Average Exercise Price	2.38
Weighted-Average Exercise Price, Options Ending balance	$ 4.63	$ 4.79
Warrants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding, Beginning balance	1,046,813
Granted, Options Outstanding	0
Expired / Canceled, Options Outstanding	(3,350)
Exercised, Options Outstanding	(822,093)
Options Outstanding, Ending balance	221,370	1,046,813
Weighted-Average Exercise Price, Options Beginning balance	$ 2.29
Granted, Weighted-Average Exercise Price	0
Expired / Canceled, Weighted-Average Exercise Price	1.00
Exercised, Weighted-Average Exercise Price	0.98
Weighted-Average Exercise Price, Options Ending balance	$ 7.16	$ 2.29

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)-(4)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price of options that were either forfeited or expired.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)-(4)
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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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