Income Taxes - Summary of Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Deferred tax assets:
Net operating loss carry forwards	$ 0	$ 0
Research and development credits	0	0
Depreciation and amortization	5	28
Accrued expenses and reserves	173	886
Stock compensation	3,899	3,941
Other, net	1	20
Total deferred tax assets	4,078	4,875
Valuation allowance	(4,078)	(4,875)
Deferred tax assets net	$ 0	$ 0