Other License Agreements and Acquired Product Rights - Additional Information (Detail) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 29, 2016	Oct. 07, 2010	Aug. 31, 2015	Sep. 30, 2013	Dec. 31, 2015
Kunwha License Agreement [Member]
Other License Agreements And Acquired Product Rights [Line Items]
Expiration date of the agreement			Aug. 31, 2015		Jul. 23, 2027
Upfront payment					$ 300
Up-front payment net of tax					250
Milestone payments					1,300
Milestone payments net of tax					$ 1,100
Milestone payment received			$ 300
TTY License and Supply Agreement [Member]
Other License Agreements And Acquired Product Rights [Line Items]
Upfront payment		$ 300
Milestone payments		$ 1,300
Milestone payment received				$ 300
Term of the agreement					15 years
TTY License and Supply Agreement [Member] | Subsequent Event [Member]
Other License Agreements And Acquired Product Rights [Line Items]
Milestone payment received	$ 200