Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Schedule Of Income Taxes [Line Items]
Income (loss) of foreign subsidiaries before taxes	$ 165,000	$ 60,000
Deferred tax valuation allowance against assets	1,680,000
Income tax expense	5,000	$ 48,000
U.S. federal
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	$ 4,400,000
Operating loss carryovers, limitations on use	At June 30, 2019, the Company had $4.4 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	2014
U.S. federal | Latest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years	2017
States
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	$ 11,700,000
States | Earliest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years	2013
States | Latest Tax Year
Schedule Of Income Taxes [Line Items]
Open tax years	2017