Stockholders' Equity - Additional Information - Warrants Issued in Conjunction with Sale of Common Stock (Detail)	Sep. 24, 2014 $ / shares $ / Warrant shares	Apr. 18, 2014 $ / shares shares	Dec. 31, 2015 shares	Dec. 31, 2014 shares	Oct. 20, 2014 shares	May. 28, 2014 $ / shares	May. 07, 2014 $ / shares shares
Equity [Abstract]
Sale of common stock, Shares	9,000,000	1,192,500
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 at a price per warrant | $ / Warrant	0.01
Acquired period of common stock	45 days
Additional shares of common stock	700,000
Warrants issued to acquire common stock	700,000
Additional warrants acquired by underwriters					700,000
Warrants exercised period	5 years
Warrants exercise price | $ / shares	$ 2.50					$ 4.31	$ 2.65