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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 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share Reconciliation [Abstract]        
Net loss $ (2,957) $ (6,353) $ (19,777) $ (45,292)
Weighted-average shares of common stock outstanding 14,010 9,105 13,181 8,326
Weighted-average shares subject to repurchase (471) (341) (129) (98)
Shares used in per-share calculation ― basic 13,539 8,764 13,052 8,228
Shares used in per-share calculation ― diluted 13,539 8,764 13,052 8,228
Net loss per share ― basic $ (0.22) $ (0.72) $ (1.52) $ (5.50)
Net loss per share ― diluted $ (0.22) $ (0.72) $ (1.52) $ (5.50)