Revenue Recognition - Schedule of Deferred Revenues Balance as of Transition Date and Significant Activity Affecting Deferred Revenues (Detail)	6 Months Ended
	Sep. 30, 2021 USD ($)
Change In Contract With Customer Liability [Abstract]
Beginning balance at April 1, 2021	$ 22,514,000
Additions	19,370,000
Revenue recognized from beginning of period	(5,701,000)
Revenue recognized from additions	(13,435,000)
Ending balance at September 30, 2021	$ 22,748,000