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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net (loss)	$ (595)	$ (1,042)	$ (1,445)	$ (1,932)
Denominator:
Denominator for basic and diluted earnings per share — weighted average shares	22,405	26,223	22,515	26,640
Net (loss) per share:
Basic and diluted (loss) per share	$ (0.03)	$ (0.04)	$ (0.06)	$ (0.07)