Common Stock - Additional Information (Detail) (J.P. Morgan Securities Inc., USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
	Oct. 23, 2013	Oct. 29, 2013
J.P. Morgan Securities Inc.
Class of Stock [Line Items]
Stock issued during period	14,300,000	2,145,000
Issuance & sale of common stock in public offering price per share	$ 3.50
Common stock, shares issued	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