Commitments and Contingencies - Additional Information (Detail)	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2015 ft²	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 USD ($)
Operating Leased Assets [Line Items]
Non-cancelable operating lease agreements, expiration dates				From 2017 through 2023
Deferred rent		$ 5,100,000		$ 5,100,000		$ 4,900,000
Rent expense, net of sublease income, for operating leases		1,700,000	$ 1,300,000	4,700,000	$ 3,900,000
Purchase commitments		3,200,000		3,200,000		$ 3,600,000
Accrued loss		$ 0		$ 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