Quarterly report pursuant to Section 13 or 15(d)

Major Customers, Partnerships and Strategic Alliances - Agreement with Dow AgroSciences in Plant Agriculture - Additional Information (Detail)

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Major Customers, Partnerships and Strategic Alliances - Agreement with Dow AgroSciences in Plant Agriculture - Additional Information (Detail) - Dow Agro Sciences [Member] - License agreement terms [Member] - USD ($)
1 Months Ended 3 Months Ended
Oct. 31, 2005
Mar. 31, 2017
Mar. 31, 2016
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%    
Previously agreed research, development and commercialization milestone payments, and royalties on sales of products $ 4,000,000    
Fee due $ 25,300,000    
Minimum license annual fees specific reckoning period 11 years    
Revenue attributable to research and development   $ 0 $ 0
Collaboration agreement costs and expenses   $ 0 $ 0
Minimum [Member]      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Annual fees $ 250,000    
Maximum [Member]      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Annual fees $ 3,000,000