Fixed Assets - Summary of Assets Held for Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Assets Held For Sale Not Part Of Disposal Group [Line Items]
Assets held for sale, gross	$ 692	$ 0
Less accumulated depreciation	(659)	0
Assets held for sale, net	33	0
Laboratory Equipment [Member]
Assets Held For Sale Not Part Of Disposal Group [Line Items]
Assets held for sale, gross	683	0
Vehicles [Member]
Assets Held For Sale Not Part Of Disposal Group [Line Items]
Assets held for sale, gross	$ 9	$ 0