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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net loss	$ (7,281)	$ (7,325)	$ (22,533)	$ (17,680)
Denominator:
Weighted-average shares of common stock outstanding (in shares)	19,531	14,190	18,316	14,161
Weighted-average shares subject to repurchase (in shares)	(471)	(421)	(391)	(438)
Shares used in per-share calculation ― basic (in shares)	19,060	13,769	17,925	13,723
Shares used in per-share calculation ― diluted (in shares)	19,060	13,769	17,925	13,723
Net loss per share ― basic (in dollars per share)	$ (0.38)	$ (0.53)	$ (1.26)	$ (1.29)
Net loss per share ― diluted (in dollars per share)	$ (0.38)	$ (0.53)	$ (1.26)	$ (1.29)

X

- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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