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Computation of Net Income (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, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income (loss)	$ 17,293	$ (4,248)	$ 35,114	$ (26,782)
Denominator:
Weighted-average shares of common stock outstanding (in shares)	21,396	20,889	21,216	19,189
Weighted-average shares subject to repurchase (in shares)	(977)	(940)	(916)	(575)
Shares used in per-share calculation ― basic (in shares)	20,419	19,949	20,300	18,614
Shares used in per-share calculation ― diluted (in shares)	20,864	19,949	20,538	18,614
Net income (loss) per share ― basic (in dollars per share)	$ 0.85	$ (0.21)	$ 1.73	$ (1.44)
Net income (loss) per share ― diluted (in dollars per share)	$ 0.83	$ (0.21)	$ 1.71	$ (1.44)

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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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