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Equity Method Investments - Additional Information (Detail) £ in Thousands			1 Months Ended		12 Months Ended
	Jul. 07, 2017 USD ($)	Jun. 27, 2017 USD ($)	Nov. 30, 2015 USD ($) shares	Nov. 30, 2015 GBP (£) shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Position	Jan. 31, 2018	Aug. 02, 2016
Equity Method Investments [Line Items]
Gain (Loss) from dilution of equity method investment							$ (7,000)
Number of board seats retained | Position							1
Number of board seats available | Position							5
Loss from equity method investment					$ (49,000)	$ (353,000)	$ (629,000)
Investment		$ 950,000			$ 950,000	$ 3,283,000	125,000
Profeng Australia, Pty Ltd
Equity Method Investments [Line Items]
Joint venture, consideration	$ 1,900,000
TyraTech Inc.
Equity Method Investments [Line Items]
Shares issued by equity investee | shares			105,333,333	105,333,333
Amount raised by equity investee on shares issued			$ 4,800,000	£ 3,200
Equity investment ownership position					15.11%	15.11%
Carrying value of equity investment					$ 2,006,000
Quoted market value of equity investment					1,970,000
Loss from equity method investment					$ (177,000)	$ (353,000)	$ (636,000)
TyraTech Inc. | Subsequent Event
Equity Method Investments [Line Items]
Equity investment ownership position								35.00%
Huifeng/AMVAC Innovation Co., Ltd.
Equity Method Investments [Line Items]
Equity investment ownership position									50.00%
Hong Kong JV
Equity Method Investments [Line Items]
Equity investment ownership position					50.00%
Loss from equity method investment					$ 128,000	$ 0

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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