Income Taxes - Reconciliation of the Income Tax Expenses at the Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Impact of tax uncertainties	$ (1,200)	$ (603)
Foreign tax rate differential	1,706	2,255	$ 5,287
(Increase) decrease in valuation allowance against deferred tax assets	(2,432)	(2,313)	(5,331)
Income tax (provision) benefit	$ (1,926)	$ (661)	$ (44)