Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss	$ (915)	$ (1,125)
Denominator:
Denominator for basic and diluted loss per share — weighted average shares	21,043	21,043
Net loss per share:
Basic and diluted loss per share	$ (0.04)	$ (0.05)