Fair Value - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - Money Market Funds [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets
Assets	$ 75,638	$ 80,078
Level 1 [Member]
Assets
Assets	75,638	80,078
Level 2 [Member]
Assets
Assets	0	0
Level 3 [Member]
Assets
Assets	$ 0	$ 0