License Agreement - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 1998
License Agreements [Line Items]
Monthly license fees					$ 2,000
Potential future development payments					800,000
Development payment	0	0	0	0
Royalty payment	$ 0	$ 0	$ 0	$ 0