Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule Of Income Taxes [Line Items]
Corporate tax rate	21.00%	21.00%
Income (loss) of foreign subsidiaries before taxes	$ 123,000	$ (425,000)
Deferred tax valuation allowance against assets	3,516,000	$ 2,901,000
U.S. federal
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	$ 11,000,000
U.S. federal | Earliest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years	2016
U.S. federal | Latest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years	2019
States
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	$ 14,500,000
States | Earliest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years	2011
States | Latest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years	2019