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Major Customers, Partnerships and Strategic Alliances - CHDI Foundation, Inc. - Additional Information (Detail) (CHDI Foundation, Inc. [Member], USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Apr. 30, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CHDI Foundation, Inc. [Member]
        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Funds due under agreement $ 1.3      
Agreement date Apr. 30, 2011      
Agreement to receive 1 year      
Contractual agreement termination date   Aug. 30, 2012    
Funds due under agreement as per amendment     2.1  
Collaboration agreement related costs and expenses     1.1 1.1
Revenues under the agreement     $ 1.1 $ 1.2