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, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net loss	$ (945)	$ (988)	$ (3,026)	$ (2,851)
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	$ (0.04)	$ (0.05)	$ (0.14)	$ (0.14)