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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net loss	$ (632)	$ (956)	$ (1,547)	$ (2,081)
Denominator:
Denominator for basic and diluted loss per share — weighted average shares	21,043	21,043	21,043	21,043
Net loss per share:
Basic and diluted loss per share	$ (0.03)	$ (0.05)	$ (0.07)	$ (0.10)