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Forward Cover Contract - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative financial instruments gain or loss | $ (1,401,000) |  |
Foreign Exchange Forward Cover Contract | Agrovant and Defensive |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative financial instruments gain or loss | $ (1,401,000) | $ 0 | $ 0

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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