Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Sep. 30, 2018	Sep. 30, 2018	Apr. 01, 2018	Mar. 31, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	[1]	$ 102,869	$ 102,869		$ 78,708
Capitalized commission costs			14,571
Commission expenses		1,275	2,864
Prepaid Expenses And Other Current Assets
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized commission costs			3,392
Other Noncurrent Assets
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized commission costs			11,179
Accounting Standards Update 2014-05 | ASC 606 Transition Adjustments
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings				$ 8,419
Revenue, Remaining Performance Obligation, Amount		$ 465,400	$ 465,400
Percentage of revenue expected to recognize as services rendered and goods delivered		9.00%	9.00%
Percentage of revenue expected to recognize over next 12 months		48.00%	48.00%

[1] Includes cumulative effect adjustment related to the adoption of ASC 606, as defined in Note 1. See Note 1 for additional details.