Stockholders' Equity - Additional Information - Sale of Common Stock and Warrants (Detail) (USD $)	0 Months Ended				12 Months Ended
	Sep. 24, 2014	May 28, 2014	May 07, 2014	Apr. 18, 2014	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Warrant conversion, shares	9,000,000			1,192,500
Warrant conversion, amount				$ 2,385,000	$ 18,577,018
Warrant to purchase common stock, per share	$ 2.00	$ 4.31	$ 2.65	$ 2.00
Warrants issued to third parties for services				248,500
Common stock, shares issued	9,000,000				111,601,304	95,814,565
Warrants issued	9,000,000		200,000
Common stock, stock price	$ 1.99
Common stock at a price per warrant	0.01
Gross proceeds from issuance of common stock and warrants	$ 18,000,000