Other License Agreements and Acquired Product Rights - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended
	Oct. 07, 2010	Nov. 30, 2011	Sep. 30, 2013	Jun. 30, 2014
Kunwha License Agreement [Member]
Other License Agreements And Acquired Product Rights [Line Items]
Expiration date of the agreement				Jul. 23, 2027
Upfront payment				$ 0.3
Up-front payment net of tax				0.25
Milestone payments				1.3
Milestone payments net of tax				1.1
TTY License and Supply Agreement [Member]
Other License Agreements And Acquired Product Rights [Line Items]
Upfront payment	0.3
Milestone payments	1.3
Term of the agreement				15 years
Milestone payment received		$ 0.3	$ 0.3