Convertible Promissory Notes - Additional Information (Detail) (USD $)	1 Months Ended			3 Months Ended	9 Months Ended		128 Months Ended				1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended			1 Months Ended				9 Months Ended			1 Months Ended			1 Months Ended
	Sep. 24, 2013	Jun. 30, 2013	Jan. 31, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Jan. 29, 2013	Jan. 23, 2013	Dec. 31, 2012	Sep. 24, 2013 July 2012 Notes	Sep. 30, 2013 July 2012 Notes	Feb. 28, 2013 Common Stock	Sep. 30, 2013 Common Stock	Feb. 28, 2013 January 2013 Notes	Sep. 30, 2013 January 2013 Notes	Feb. 28, 2013 January 2013 Notes Common Stock	Sep. 24, 2013 Amendment July 2012 Notes	Sep. 23, 2013 Amendment July 2012 Notes	Sep. 24, 2013 Amendment Common Stock July 2012 Notes	Sep. 23, 2013 Amendment Minimum July 2012 Notes	Sep. 23, 2013 Amendment Maximum July 2012 Notes	Sep. 30, 2013 Option and License Agreement	Sep. 30, 2013 Related Party	Sep. 30, 2013 Related Party Transactions	Jul. 31, 2012 Related Party Transactions	Feb. 28, 2013 Convertible debt	Jan. 23, 2013 Convertible debt	Sep. 24, 2013 Convertible debt	Feb. 28, 2013 Convertible debt Common Stock	Jan. 23, 2013 Convertible debt Related Party
Debt Instrument [Line Items]
Gross proceed from the issuance of convertible note																												$ 650,000			$ 100,000
Debt Instrument, Maturity Date																												Jan. 23, 2014
Convertible debt instrument, effective interest rate																												12.00%	12.00%
Convertible debt, conversion price																		$ 1.91			$ 1.50	$ 2.25				$ 1.91		$ 1.30
Minimum receipt of proceeds from sale of equity securities and/or as payments from partners to pay any remaining balance of note payable																												7,500,000
Number of business days to pay remaining convertible debts																												5 days
Debt instrument, beneficial conversion feature			141,829		141,829																				21,820
Discount on warrant			195,969		195,969	2,314,635	6,170,341
Warrants issued			243,750					187,500	243,750
Gross proceeds from sales of common stock and warrants to purchase shares of common stock					3,250,000
Option and License Agreement, upfront payment received																							5,000,000
Principal and interest paid					567,368																			100,000
Common shares issued, note conversion	1,714,697												365,263	2,079,960			77,034			1,714,697
Convertible notes, principal amount converted												900,000			100,000												900,000
Amortization of debt discount to interest expense					1,613,354	34,600	8,470,084									337,798
Common shares issued		123,231			900,000																									288,229
Aggregate principal amount outstanding											756,141								3,185,000
Conversion of convertible notes					4,275,053									20,799				3,275,053
Loss on extinguishment of debt				(2,518,912)	(2,518,912)		(906,472)				(2,518,912)
Accrued interest											98,053
Unamortized debt discount											2,432,681
Unamortized deferred financing cost										$ 211,479	$ 86,231