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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Apr. 01, 2018
Disaggregation of Revenue [Line Items]
Net revenue	$ 36,618	$ 36,014	$ 34,203	$ 34,007	$ 32,056	$ 31,310	$ 30,129	$ 33,865	$ 140,842	$ 127,360	$ 127,678
Revenue recognized									33,100
Transfers to accounts receivable									4,600
Capitalized contract cost, net	$ 3,300								3,300			$ 1,900
Amortization of capitalized amount									1,100
Sales Commissions and Fees									4,500
Products
Disaggregation of Revenue [Line Items]
Net revenue									39,003	$ 33,699	$ 38,339
Support, maintenance and subscription services
Disaggregation of Revenue [Line Items]
Net revenue									$ 101,800