Geographic Information - Schedule of Revenue From Customer By Geographic Area (Detail) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue		$ 43,379	$ 32,656	$ 29,134
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue		28,135	17,831	14,754
France [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue		7,406	7,105	6,501
Japan [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue		4,506	4,333	3,846
Other foreign countries [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	[1]	$ 3,332	$ 3,387	$ 4,033

[1] No individual country represented more than 10% of the respective totals.