Other License Agreements and Acquired Product Rights - Additional Information (Detail) - TTY License and Supply Agreement [Member] - USD ($) $ in Thousands		1 Months Ended					6 Months Ended
	Oct. 07, 2010	Jun. 30, 2017	Mar. 31, 2017	Feb. 28, 2017	Jun. 30, 2016	Feb. 28, 2016	Jun. 30, 2017
Other License Agreements And Acquired Product Rights [Line Items]
Upfront payment	$ 300
Milestone payments	$ 1,300
Term of the agreement							15 years
Milestone payment received		$ 100	$ 30	$ 200	$ 240	$ 240