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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net loss $ (7,325) $ (7,698) $ (17,680) $ (16,819)
Denominator:        
Weighted-average shares of common stock outstanding (in shares) 14,190 14,054 14,161 12,958
Weighted-average shares subject to repurchase (in shares) (421) (459) (438) (150)
Shares used in per-share calculation ― basic (in shares) 13,769 13,595 13,723 12,808
Shares used in per-share calculation ― diluted (in shares) 13,769 13,595 13,723 12,808
Net loss per share ― basic (in dollars per share) $ (0.53) $ (0.57) $ (1.29) $ (1.31)
Net loss per share ― diluted (in dollars per share) $ (0.53) $ (0.57) $ (1.29) $ (1.31)