Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net (loss) income	$ (1,171)	$ 448	$ (3,103)	$ 559
Denominator:
Denominator for basic and diluted earnings per share — weighted average shares	24,299	27,129	25,857	27,130
Net (loss) income per share:
Basic and diluted (loss) income per share	$ (0.05)	$ 0.02	$ (0.12)	$ 0.02