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Major Customers, Partnerships and Strategic Alliances - Agreement with Dow AgroSciences in Plant Agriculture - Additional Information (Detail) (Dow AgroSciences [Member], USD $)
 1 Months Ended 12 Months Ended
Oct. 31, 2005
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research program to develop laboratory research reagents 3 years      
One-time license fee earned on exercise of option $ 6,000,000      
Royalty revenues 2,300,000      
Percentage of royalties to be received from sublicensing 25.00%      
Minimum sublicense annual fees specific reckoning period 11 years      
Fee due 25,300,000      
Revenue attributable to research and development   3,000,000 4,700,000 4,500,000
Collaboration agreement related costs and expenses   400,000 600,000 900,000
License agreement terms [Member]
        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Royalty revenues 4,000,000      
Minimum [Member]
        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Annual fees 250,000.0      
Maximum [Member]
        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Annual fees $ 3.0