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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

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