Convertible Preferred Stock - Additional Information (Detail) (Preferred Stock [Member]) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock conversion rate	All of the outstanding shares of preferred stock converted into common stock at the conversion rate of 1:1.
Preferred stock conversion ratio	1
Outstanding preferred stock converted into fully paid shares of common stock	18,753