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Major Customers, Partnerships and Strategic Alliances - Agreement with Sigma-Aldrich Corporation - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 31, 2009 | Jul. 31, 2007 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |
Research and development |  |  | $ 14,984 | $ 19,454 | $ 27,926 | $ 34,720
Sigma-Aldrich Corporation [Member] |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |
Research program to develop laboratory research reagents |  | 3 years |  |  |  |
Upfront license fee | $ 20,000 |  |  |  |  |
Public offering, common stock shares issued | 636,133 |  |  |  |  |
Reduced royalty rate | 10.50% |  |  |  |  |
Funding available under the amended agreement | $ 25,000 |  |  |  |  |
Sigma-Aldrich Corporation [Member] | Upfront license fee [Member] |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |
Upfront license fee | 15,100 |  |  |  |  |
Common stock issued under license agreement | $ 4,900 |  |  |  |  |
Sigma-Aldrich Corporation [Member] | License agreement terms [Member] |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |
Revenues under agreement |  |  |  |  | 5,000 |
Research and development |  |  | $ 0 | $ 0 | $ 0 | $ 0

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