Summary of Allowance for Doubtful Accounts Receivable (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Receivables [Abstract]
Balance at Beginning of Period	$ 1,040	$ 320	$ 282
Additions	487	720	38
Write-offs	(325)
Balance at End of Period	$ 1,202	$ 1,040	$ 320