Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 137,176	$ 160,757	$ 140,842
Revenue recognized	40,900	37,000
Transfers to accounts receivable	2,000	2,800
Capitalized contract cost, net	2,900	3,200
Sales commissions and fees	2,800	4,700
Capitalized contract cost, amortization	1,400	1,400
Products [Member]
Disaggregation Of Revenue [Line Items]
Total net revenue	26,714	44,230	39,003
Support, Maintenance, Subscription Services, and Professional Services [Member]
Disaggregation Of Revenue [Line Items]
Total net revenue	$ 110,500	$ 116,500	$ 101,800