Commitments and Contingencies - Additional Information (Detail)	3 Months Ended
	Jun. 30, 2015 USD ($) ft²	Jun. 30, 2014 USD ($)	Mar. 31, 2015 USD ($)
Operating Leased Assets [Line Items]
Non-cancelable operating lease agreements, expiration dates	From 2015 through 2023
Deferred rent	$ 4,900,000		$ 4,900,000
Rent expense, net of sublease income, for operating leases	1,300,000	$ 1,300,000
Purchase commitments	4,400,000		$ 3,600,000
Accrued loss	$ 0
San Francisco, California [Member]
Operating Leased Assets [Line Items]
Operating lease agreements, lease term	8 years
Operating lease agreements, area leased | ft²	14,067
Operating lease agreements, additional area leased | ft²	42,201