Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Accounts Payable And Accrued Liabilities Current [Line Items]
Accounts payable and accrued expenses	$ 1,103,472	$ 1,055,738
Research and Development Expenses [Member]
Accounts Payable And Accrued Liabilities Current [Line Items]
Accounts payable and accrued expenses	430,824	470,824
Professional Fees [Member]
Accounts Payable And Accrued Liabilities Current [Line Items]
Accounts payable and accrued expenses	251,898	201,146
General and Administrative Expenses [Member]
Accounts Payable And Accrued Liabilities Current [Line Items]
Accounts payable and accrued expenses	346,566	307,883
Compensation Related Expenses [Member]
Accounts Payable And Accrued Liabilities Current [Line Items]
Accounts payable and accrued expenses	$ 74,184	$ 75,885