Stockholders' Equity - Additional Information - Sale of Common Stock and Warrants (Detail)	Sep. 24, 2014 USD ($) $ / shares $ / Warrant shares	Apr. 18, 2014 USD ($) $ / shares shares	Dec. 31, 2015 shares	Dec. 31, 2014 shares	May. 07, 2014 shares
Equity [Abstract]
Warrant conversion, shares	9,000,000	1,192,500
Warrant conversion, amount | $		$ 2,385,000
Warrant to purchase common stock, per share | $ / shares	$ 2.00	$ 2.00
Warrants issued to third parties for services		248,500
Common stock, shares issued	9,000,000		111,788,225	111,601,304
Warrants issued	9,000,000				200,000
Common stock, stock price | $ / shares	$ 1.99
Common stock at a price per warrant | $ / Warrant	0.01
Gross proceeds from issuance of common stock and warrants | $	$ 18,000,000