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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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