Fair Value Measurements - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 17, 2013
Fair Value Disclosure [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 14.30	$ 2.66
Series A Preferred Stock [Member]
Fair Value Disclosure [Line Items]
Debt instrument convertible threshold stock price	$ 0.289
Purchase of warrants to common stock	$ 238,412
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 3.04