Other License Agreements and Acquired Product Rights - Additional information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended			9 Months Ended	1 Months Ended
	Jul. 29, 2013 TTY License and Supply Agreement [Member]	Nov. 30, 2011 TTY License and Supply Agreement [Member]	Oct. 07, 2010 TTY License and Supply Agreement [Member]	Sep. 30, 2013 TTY License and Supply Agreement [Member]	May 31, 2010 Kunwha License Agreement [Member]
Other License Agreements And Acquired Product Rights [Line Items]
Upfront payment			$ 0.3		$ 0.3
Up-front payment net of tax					0.25
Milestone payments			1.3		1.3
Milestone payments net of tax					1.1
Expiration date of the agreement					Jul. 23, 2027
Term of the agreement				15 years
Milestone payment received	$ 0.3	$ 0.3