Segment and Geographic Information - Segment Geographic Information on Revenues and Long-Lived Assets by Geographic (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Entity Wide Revenue Major Customer [Line Items]
Net revenues	$ 39,351	$ 36,016	$ 32,795	$ 30,553	$ 27,192	$ 30,411	$ 23,854	$ 22,112	$ 138,715	$ 103,569	$ 74,751
Property and equipment, net	8,183				3,430				8,183	3,430	2,757
United States and Canada
Entity Wide Revenue Major Customer [Line Items]
Net revenues									90,245	72,898	40,743
Property and equipment, net	8,132				3,405				8,132	3,405	2,701
Europe, Middle East, and Africa
Entity Wide Revenue Major Customer [Line Items]
Net revenues									34,970	18,606	5,691
Property and equipment, net	38				15				38	15	41
Asia Pacific and China
Entity Wide Revenue Major Customer [Line Items]
Net revenues									11,865	9,324	23,608
Property and equipment, net	13				10				13	10	15
Mexico, Central America, and South America
Entity Wide Revenue Major Customer [Line Items]
Net revenues									1,635	2,741	4,709
Property and equipment, net	$ 0				$ 0				$ 0	$ 0	$ 0