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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Apr. 01, 2018
Disaggregation of Revenue [Line Items]
Net revenue	$ 34,203	$ 30,129	$ 68,210	$ 63,994
Revenue recognized	8,200		19,800
Transfers to accounts receivable	200		3,200
Capitalized contract cost, net					$ 1,900
Capitalized Contract Cost, Amortization	900		1,800
Products
Disaggregation of Revenue [Line Items]
Net revenue	8,769	$ 7,318	17,849	$ 17,601
Support, Maintenance, Subscription Services, And Professional Services [Member]
Disaggregation of Revenue [Line Items]
Net revenue	$ 25,434		$ 50,361