Common Stock - Additional Information (Detail) (J.P. Morgan Securities Inc., USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Oct. 29, 2013	Oct. 23, 2013
J.P. Morgan Securities Inc.
Class of Stock [Line Items]
Stock issued during period	2,145,000	14,300,000
Issuance & sale of common stock in public offering price per share		$ 3.50
Option granted, exercisable period		30 days
Option to purchase common stock	2,145,000
Sale of stock price per share		$ 3.29
Net proceeds from issuance of common stock	$ 53.9