Income Taxes - Components of Deferred Tax (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Provisions and reserves	$ 1,484	$ 1,442
Fixed asset basis difference	44	34
Operating lease liability	3,994
Net operating loss carry forwards	20,313	17,330
Gross deferred tax assets	25,835	18,806
Operating lease right-of-use assets	(3,994)
Net deferred tax asset	21,841	18,806
Valuation allowance	(21,277)	(18,201)
Total	$ 564	$ 605