Variable Interest Entity - Additional Information (Detail)	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended		20 Months Ended
	Sep. 30, 2014 USD ($) shares	Feb. 29, 2012 Soybean_Grower	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($)	Aug. 31, 2014 USD ($)
Variable Interest Entity [Line Items]
Variable interest entity agreement, terms					Both the Company and Bioceres incur expenses in support of specific agreed activities, as defined by joint work plans, which apply fair market value to each partner’s activities. Unequal contributions of services are equalized by the partners through cash payments. Verdeca is not the primary obligor for these activities performed by the Company or Bioceres. An agreement executed in conjunction with the formation of Verdeca specified that if Bioceres determines it requires cash to fund its contributed services (subject to certain annual limits), Bioceres, S.A. may elect to sell shares of its common stock to the Company for an amount not exceeding $5.0 million in the aggregate over a four-year period.
Funding period of cash required for contributed services					4 years
Aggregate value of common stock purchased									$ 2,000,000
Number of shares surrendered | shares	1,832
Research agreement settled							$ 205,000
Number of share remaining | shares							632
Fair value of share held							$ 500,000
Cost method investment							$ 0
Direct and allocated overhead amount			$ 261,000	$ 487,000	$ 98,000	$ 221,000
Research And Development Expense [Member]
Variable Interest Entity [Line Items]
VIE agreement amendment expense								$ 1,500,000
Amended Purchase Commitment Of Common Stock [Member]
Variable Interest Entity [Line Items]
Commitment to purchase stock in 2014	$ 500,000
Maximum [Member]
Variable Interest Entity [Line Items]
Commitment to purchase stock					5,000,000
Maximum [Member] | Purchase Commitment of Common Stock [Member]
Variable Interest Entity [Line Items]
Commitment to purchase stock in 2014					2,000,000
Commitment to purchase stock in 2015					$ 1,200,000
Bioceres, S.A. [Member]
Variable Interest Entity [Line Items]
Number of soybean growers owned | Soybean_Grower		250