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Computation of Net Loss Per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share Reconciliation [Abstract]        
Net loss $ (7,698) $ (25,423) $ (16,819) $ (38,939)
Weighted-average shares of common stock outstanding 14,054 8,305 12,958 8,088
Weighted-average shares subject to repurchase (459) (158) (150) (129)
Shares used in per-share calculation ― basic 13,595 8,147 12,808 7,959
Shares used in per-share calculation ― diluted 13,595 8,147 12,808 7,959
Net loss per share ― basic $ (0.57) $ (3.12) $ (1.31) $ (4.89)
Net loss per share ― diluted $ (0.57) $ (3.12) $ (1.31) $ (4.89)