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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 6 Months Ended
Oct. 31, 2005
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
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        
Collaboration agreement related costs and expenses   $ 0 $ 0 $ 0 $ 0
Revenue attributable to research and development   $ 0 $ 0 $ 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