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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
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Oct. 31, 2005 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 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 | $ 0 | $ 0
Collaboration agreement costs and expenses |  | $ 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 |  |  |  |

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