Fair Value Measurements - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2015	Oct. 31, 2014	Jan. 31, 2014	Dec. 17, 2013
Fair Value Disclosure [Line Items]
Purchase of warrants to common stock			$ 238,412
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 3.04	$ 2.66
Debt Instrument, Debt Default, Amount	$ 5,000,000
Debt Conversion, Converted Instrument, Amount	$ 3,000,000
Minimum [Member]
Fair Value Disclosure [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 2.27
Series A Preferred Stock [Member]
Fair Value Disclosure [Line Items]
Debt instrument convertible threshold stock price	$ 0.289