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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 ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2005
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	$ 3,000,000	$ 5,100,000	$ 3,000,000
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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
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-Topic 225
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