Summary of Significant Accounting Policies - Schedule of Available-for-Sale Securities, All of Which Have Maturities of Twelve Months or Less (Detail) (Commercial Paper [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 14,998
Unrealized Gains
Unrealized Losses	(3)
Fair Value	$ 14,995