Fixed Assets - Summary of Assets Held for Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Assets Held For Sale Not Part Of Disposal Group [Line Items]
Assets held for sale, gross	$ 0	$ 692
Less accumulated depreciation	0	(659)
Assets held for sale, net	0	33
Laboratory Equipment [Member]
Assets Held For Sale Not Part Of Disposal Group [Line Items]
Assets held for sale, gross	0	683
Vehicles [Member]
Assets Held For Sale Not Part Of Disposal Group [Line Items]
Assets held for sale, gross	$ 0	$ 9