Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended
	Jan. 15, 2014	Jan. 31, 2014	Sep. 30, 2015	Dec. 31, 2014
Shareholders Equity [Line Items]
Common stock and warrants issued, shares	5,000,000
Common stock and warrants issued, Value		$ 15.0
Common Stock, shares issued			89,762,872	89,762,872
Common Stock, shares outstanding			89,762,872	89,762,872
Warrants Exercisable Term		5 years
Preferred Stock Shares Outstanding			0	0
Warrant
Shareholders Equity [Line Items]
Common stock and warrants issued, shares	2,500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 4.74	$ 0.90