Fair Value of Financial Instruments - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Level 1
Assets:
Fair value measurement disclosure	$ 49,141
Level 2
Assets:
Fair value measurement disclosure	0
Level 3
Assets:
Fair value measurement disclosure	0
Fair Value
Assets:
Fair value measurement disclosure	49,141
Cash and cash equivalents | Level 1
Assets:
Fair value measurement disclosure	48,876
Cash and cash equivalents | Level 2
Assets:
Fair value measurement disclosure	0
Cash and cash equivalents | Level 3
Assets:
Fair value measurement disclosure	0
Cash and cash equivalents | Fair Value
Assets:
Fair value measurement disclosure	48,876
Restricted cash | Level 1
Assets:
Fair value measurement disclosure	265
Restricted cash | Level 2
Assets:
Fair value measurement disclosure	0
Restricted cash | Level 3
Assets:
Fair value measurement disclosure	0
Restricted cash | Fair Value
Assets:
Fair value measurement disclosure	$ 265