Income Taxes - Schedule of Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Current - Federal	$ (126)	$ (293)
Deferred - Federal	(1,800)	(368)	$ (44)
Income tax (provision) benefit	$ (1,926)	$ (661)	$ (44)