Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Income Taxes [Line Items]
Income (loss) of foreign subsidiaries before taxes	$ 393,000	$ 215,000
Deferred tax valuation allowance against assets	2,100,000		$ 2,100,000
Income tax expense	4,000	$ 2,000	19,000	$ 73,000
U.S. federal
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	5,900,000		$ 5,900,000
Operating loss carryovers, limitations on use			At December 31, 2019, the Company had $5.9 million of U.S. federal net operating loss (“NOL”) carry forwards. These losses do not expire but are limited to utilization of 80% of taxable income in any one year.
Percentage of NOLs utilization limit against taxable income			80.00%
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			2018
States
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	$ 13,200,000		$ 13,200,000
States | Earliest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years			2015
States | Latest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years			2018