Income Taxes - Additional Information (Detail)	3 Months Ended		6 Months Ended	9 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) installment	Dec. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)
Schedule Of Income Taxes [Line Items]
Income (loss) of foreign subsidiaries before taxes			$ 103,000		$ 393,000
Deferred tax valuation allowance against assets, Percent				100.00%
Deferred tax valuation allowance against assets	$ 3,700,000			$ 3,700,000
Provision for income tax expense	10,000	$ 4,000		15,000	$ 19,000
Federal tax liability	2,031,000			$ 2,031,000
Federal tax liability payable period				8 years
Federal tax liability, Current portion	195,000,000			$ 195,000,000		$ 195,000,000
Federal tax liability, Non-current portion	1,836,000,000			$ 1,836,000,000		$ 2,033,000,000
Percentage of federal tax liability payable in first five installments				8.00%
Percentage of federal tax liability payable in sixth installment				15.00%
Percentage of federal tax liability payable in seventh installment				20.00%
Percentage of federal tax liability payable in final installment				25.00%
Number of installments for federal tax liability payable | installment				8
Number of installments of federal tax liability paid | installment				3
U.S. federal
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	10,600,000			$ 10,600,000
Operating loss carryovers, limitations on use				At December 31, 2020, the Company had $10.6 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				2019
States
Schedule Of Income Taxes [Line Items]
Net operating loss carry forwards, amount	$ 18,500,000			$ 18,500,000
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				2019