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Computation of Net (Loss) Income Per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Net loss	$ (10,513)	$ (10,275)
Weighted-average shares of common stock outstanding	60,463	51,997
Weighted-average shares subject to repurchase	(2,163)	(806)
Shares used in per-share calculation - basic	58,300	51,191
Shares used in per-share calculation - diluted	58,300	51,191
Net loss per share - basic	$ (0.18)	$ (0.20)
Net loss per share - diluted	$ (0.18)	$ (0.20)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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