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Subsequent Events - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Subsequent Event [Line Items] |  |  |  |  |  |
Proceeds from sales of equity securities |  |  |  |  | $ 589 | $ 217
Gain on equity securities |  |  | $ (3,068) | $ (7,287) | $ 2,634 | $ (27,565)
AquaBounty Technologies, Inc. | Forecast |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Gain on equity securities |  | $ 5,267 |  |  |  |
Affiliate of Third Security, LLC | AquaBounty Technologies, Inc. | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Proceeds from sales of equity securities | $ 21,587 |  |  |  |  |

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- Definition The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition The amounts of gains and losses from fair value changes and disposition of equity securities and preferred stock included in earnings. + References No definition available. + Details
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