Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2014
Accounting Policies [Line Items]
Reserved for doubtful accounts	$ 0	$ 0
Write-down of inventory	500,000	600,000
Impairment of long-lived assets	$ 0	0
Maximum [Member]
Accounting Policies [Line Items]
Cost method investment ownership percentage	20.00%
Limagrain Cereal Seeds LLC [Member]
Accounting Policies [Line Items]
Equity method investments	$ 0	0	$ 0
Impairment of equity method investments	$ 0	$ 0