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Major Customers, Partnerships and Strategic Alliances - Michael J. Fox Foundation for Parkinson's Research - Additional Information (Detail) (Michael J. Fox Foundation for Parkinson's Research [Member], USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 2013
Jan. 31, 2007
Jan. 31, 2007
Additional Funding Agreement Terms [Member]
Jun. 30, 2010
Additional Funding Agreement Terms [Member]
Dec. 31, 2013
License agreement terms [Member]
Dec. 31, 2012
License agreement terms [Member]
Dec. 31, 2011
License agreement terms [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Agreement date   Jan. 31, 2007          
Funding received from research grant $ 1.9     $ 0.9      
Funds due under the agreement     1.0        
Revenues under the agreement         $ 0 $ 0 $ 0.4