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Other License Agreements and Acquired Product Rights - Additional Information (Detail) - TTY License and Supply Agreement [Member] - USD ($)
$ in Millions
 3 Months Ended
Feb. 04, 2016
Oct. 07, 2010
Mar. 31, 2016
Sep. 30, 2013
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 $ 0.2     $ 0.3