Computation of Basic and Diluted Earnings Per Share (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) income	$ (1,042)	$ 165	$ (1,932)	$ 111
Denominator:
Denominator for basic and diluted earnings per share — weighted average shares	26,223	27,130	26,640	27,130
Net (loss) income per share:
Basic and diluted (loss) income per share	$ (0.04)	$ 0.01	$ (0.07)	$ 0.00