Stockholders' Equity - Summary of Stock Option Activity (Detail) (USD $)	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, Beginning balance	5,935,888	3,618,567
Granted, Options Outstanding	1,429,191	2,519,572
Canceled, Options Outstanding	(45,847)	(18,455)
Exercised, Options Outstanding	(205,684)	(183,796)
Options Outstanding, Ending balance	7,113,548	5,935,888
Vested and Exercisable, Options Outstanding	3,113,164
Weighted-Average Exercise Price, Options Beginning balance	$ 4.87	$ 2.11
Options granted, Weighted-Average Exercise Price	$ 6.18	$ 8.63
Options canceled, Weighted-Average Exercise Price	$ 7.17	$ 3.31
Options exercised, Weighted-Average Exercise Price	$ 1.73	$ 2.19
Weighted-Average Exercise Price, Options Ending balance	$ 5.21	$ 4.87
Vested and Exercisable, Weighted-Average Exercise Price	$ 4.05
Aggregate Intrinsic Value, Options Beginning balance	$ 20,482,823	$ 5,909,154
Options Exercised, Aggregate Intrinsic Value	883,795	1,002,419
Aggregate Intrinsic Value, Options Ending balance	4,969,499	20,482,823
Vested and Exercisable at March 31, 2015	$ 3,264,723

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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.

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

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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Number of share options (or share units) exercised during the current period.

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