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Major Customers, Partnerships and Strategic Alliances - Agreement with DAS (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2005
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	$ 25,800,000	$ 57,763,000	$ 21,553,000	$ 13,076,000	$ 54,851,000	$ 21,958,000	$ 17,548,000	$ 8,071,000	$ 118,192,000	$ 102,428,000	$ 84,452,000
Dow Agro Sciences \| License agreement terms
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												$ 6,000,000.0
Previously agreed research, development and commercialization milestone payments, and royalties on sales of products												$ 4,000,000.0
Percentage of royalties to be received from sublicensing												25.00%
Fee due												$ 25,300,000
Minimum license annual fees specific reckoning period												11 years
Dow Agro Sciences \| License agreement terms \| Minimum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Annual fees												$ 300,000
Dow Agro Sciences \| License agreement terms \| Maximum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Annual fees												3,000,000.0
Dow Agro Sciences \| License agreement terms \| Royalty revenues
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues												$ 2,300,000
Dow Agro Sciences \| License agreement terms \| License fee revenues
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues									$ 3,000,000.0	$ 3,000,000.0	$ 3,000,000.0