Other License Agreements and Acquired Product Rights - Additional Information (Detail) - USD ($) $ in Thousands					1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 04, 2016	Jun. 30, 2016	Feb. 04, 2016	Oct. 07, 2010	Aug. 31, 2015	Sep. 30, 2013	Dec. 31, 2016
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	$ 400	$ 200	$ 200			$ 300
Term of the agreement							15 years