Fair Value of Financial Instruments - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] $ in Thousands	Sep. 30, 2016 USD ($)
Level 1
Assets:
Fair value measurement disclosure	$ 0
Level 2
Assets:
Fair value measurement disclosure	30,104
Level 3
Assets:
Fair value measurement disclosure	0
Certificates of Deposit [Member] | Level 1
Assets:
Fair value measurement disclosure	0
Certificates of Deposit [Member] | Level 2
Assets:
Fair value measurement disclosure	30,104
Certificates of Deposit [Member] | Level 3
Assets:
Fair value measurement disclosure	0
Fair Value
Assets:
Fair value measurement disclosure	30,104
Fair Value | Certificates of Deposit [Member]
Assets:
Fair value measurement disclosure	$ 30,104