Accounts Payable and Accrued Expenses - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Feb. 15, 2013
Payables And Accruals [Abstract]
Vested options to purchase of common stock		$ 167,400
Vested options to purchase of common stock, Shares		167,400
Options exercised expiration date	Feb. 28, 2018
Outstanding liability under settlement agreement	$ 167,400