Goodwill and Purchased Intangibles Assets - Schedule of Purchased Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	$ 17,928	$ 12,986
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,500	20,116
Accumulated Amortization	(9,572)	(7,130)
Net Carrying Amount	$ 17,928	$ 12,986