Organization and Basis of Presentation - Schedule of Cumulative Effect of Changes to Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Apr. 01, 2018	Mar. 31, 2018
Assets
Deferred contract costs, net	$ 5,530
Deferred contract costs, net of current portion	19,817
Liabilities
Deferred revenue	120,612		$ 123,057
Deferred revenue, net of current portion	12,002		18,045
Shareholders' equity
Accumulated deficit	(80,102)		$ (106,507)
ASU 2014-09 [Member]
Assets
Deferred contract costs, net		$ 5,494
Deferred contract costs, net of current portion		18,339
Liabilities
Deferred revenue		122,540
Deferred revenue, net of current portion		12,519
Shareholders' equity
Accumulated deficit		(76,631)
ASU 2014-09 [Member] | Adjustments Due to Adoption of Topic 606
Assets
Deferred contract costs, net	5,530	5,494
Deferred contract costs, net of current portion	19,817	18,339
Liabilities
Deferred revenue	59	(517)
Deferred revenue, net of current portion	(6,215)	(5,526)
Shareholders' equity
Accumulated deficit	$ 27,316	$ 29,876