Reverse Split of Common Stock - Additional Information (Detail) (Subsequent Event [Member])	0 Months Ended
	Jul. 09, 2014
Subsequent Event [Member]
Class of Stock [Line Items]
Reverse stock split, common stock	One-for-ten reverse split of its common stock
Reverse stock split ratio, common stock	0.1
Reverse stock split, effective date	Jul. 10, 2014