Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended
	Jan. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Period of maturity on conversion of cash equivalents		90 days
Number of shares obligation to transfer	15,000
Market value of the shares			$ 42,450
Contingent royalty liability		$ 16,000,000	$ 16,000,000