Components of Net Deferred Taxes (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Deferred tax assets
Net operating loss and tax credit carryforwards	$ 27,893	$ 50,604
Stock-based compensation	13,790	13,607
Nondeductible reserves and accruals	12,097	9,570
Foreign net operating loss carryforwards	6,856	6,778
Deferred revenue	5,522	4,404
Depreciation and amortization	51	114
Other, net	312	949
Deferred Tax Assets, Gross, Total	66,521	86,026
Deferred tax liabilities
Goodwill	(7,897)	(7,843)
In-process research and development	(12,496)	(4,564)
Depreciation	(11,747)	(9,211)
Basis differences on other investments	(7,766)	(6,124)
Domestic deferred tax liability on foreign net operating loss carryforwards	(415)	(584)
Deferred Tax Liabilities, Net	(40,321)	(28,326)
Net deferred tax assets	26,200	57,700
Valuation allowance	(15,667)	(15,170)
Net deferred tax assets	10,533	42,530
Deferred tax assets	11,380	43,336
Deferred tax liabilities	(847)	(806)
Net deferred tax assets	$ 10,533	$ 42,530