Commitments and Contingencies - Additional Information (Detail) $ in Millions		1 Months Ended	12 Months Ended
	Feb. 23, 2015 USD ($) ft²	Aug. 31, 2012 USD ($) ft²	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Operating Leased Assets [Line Items]
Total rent expense			$ 7.4	$ 5.9	$ 5.5
Aggregate space that the entity will occupy under the amended lease agreement | ft²		109,000
Aggregate leasehold improvement allowance	$ 1.3
July 22, 2015 Amendment [Member]
Operating Leased Assets [Line Items]
Leased space | ft²	45,463
Additional lease payments due total	$ 9.3
Aggregate landlord reimbursable tenant improvements outstanding under the existing lease and the lease amendment			$ 8.2	$ 8.2
Maximum [Member]
Operating Leased Assets [Line Items]
Additional reimbursement for tenant improvements agreed by landlord per lease amendment		$ 8.2