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Impairments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Impairments | $ 30,138 | $ 0 | $ 0 | $ 572 | $ 17,386 | $ 30,710 | $ 17,386
GCC—Intangible Asset [Member] |  |  |  |  |  |  |
Impairments |  |  |  |  |  |  | 9,953
Wisdom Tree Japan [Member] |  |  |  |  |  |  |
Impairments |  |  |  |  |  | 572 | 326
Advisor Engine - Financial ineterest [Member] | Financial Interests [Member] |  |  |  |  |  |  |
Impairments |  |  |  |  |  | $ 30,138 |
AdvisorEngine—Option [Member] |  |  |  |  |  |  |
Impairments |  |  |  |  |  |  | 3,278
Thesys—Series Y Preferred [Member] |  |  |  |  |  |  |
Impairments |  |  |  |  |  |  | $ 3,829

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