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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 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net loss per common share        
Net loss $ (14,623) $ (15,949) $ (25,135) $ (26,224)
Weighted-average shares of common stock outstanding 62,787 52,606 61,583 52,202
Weighted-average shares subject to repurchase (1,671) (699) (1,871) (651)
Shares used in per-share calculation - basic 61,116 51,907 59,712 51,551
Shares used in per-share calculation - diluted 61,116 51,907 59,712 51,551
Net loss per share - basic $ (0.24) $ (0.31) $ (0.42) $ (0.51)
Net loss per share - diluted $ (0.24) $ (0.31) $ (0.42) $ (0.51)