Significant Agreements - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2016	Apr. 30, 2013	Jun. 30, 2016	Jun. 30, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Up-front payment upon execution of amendment	$ 7.0
Up-front payment to purchase future royalties		$ 30.0
Additional payments to UWA on successful achievement	$ 20.0
Up-front payment			$ 7.0	$ 7.0