Commitments and Contingencies - Additional Information (Detail) $ in Millions	Nov. 13, 2014 USD ($) ft² Term	Jul. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Sales tax liability accrual		$ 0.6
Office space | ft²	137,615
Lease commencement date	Jan. 01, 2016
Lease termination period	10 years 6 months
Number of successive periods of five years terms | Term	2
Lease extension period	5 years
Operating Leased Assets [Line Items]
Expected lease payments for fiscal year ended April 30, 2016	$ 0.3
Expected lease payments for fiscal year ended April 30, 2017	3.8
Expected lease payments for fiscal year ended April 30, 2018	3.8
Expected lease payments for fiscal year ended April 30, 2019	3.9
Expected lease payments for fiscal year ended April 30, 2020	4.0
Expected lease payments for fiscal years ended April 30th thereafter	25.9
Office space lease contract
Operating Leased Assets [Line Items]
Security deposit for the lease	$ 8.0