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Stockholders' Equity - Summary of Warrant Activity (Detail) - $ / shares	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding, Beginning balance	7,113,548
Granted, Options Outstanding	1,762,641
Exercised, Options Outstanding	(25,503)	(60,522)
Options Outstanding, Ending balance	8,826,683
Weighted-Average Exercise Price, Options Beginning balance	$ 5.21
Granted, Weighted-Average Exercise Price	4.92
Exercised, Weighted-Average Exercise Price	3.01
Weighted-Average Exercise Price, Options Ending balance	$ 5.16
Warrants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Outstanding, Beginning balance	1,178,109
Granted, Options Outstanding	0
Exercised, Options Outstanding	(38,234)
Cancelled, Options Outstanding	(37,500)
Options Outstanding, Ending balance	1,102,375
Weighted-Average Exercise Price, Options Beginning balance	$ 2.59
Granted, Weighted-Average Exercise Price	0
Exercised, Weighted-Average Exercise Price	1.00
Cancelled, Weighted-Average Exercise Price	7.36
Weighted-Average Exercise Price, Options Ending balance	$ 2.49

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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.

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-SubTopic 10



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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 price at which option holders acquired shares when converting their stock options into shares.

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