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Impairments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Impairments | $ 3,080 | $ 19,672 | $ 30,138 | $ 572 | $ 22,752 | $ 30,710 | $ 17,386
Wisdom Tree Japan [Member] |  |  |  |  |  |  |
Impairments |  |  |  |  |  | 572 | 326
GCC – Intangible asset [Member] |  |  |  |  |  |  |
Impairments |  |  |  |  |  |  | 9,953
AdvisorEngine – Financial interests [Member] | Financial Interests [Member] |  |  |  |  |  |  |
Impairments |  |  |  |  | 19,672 | $ 30,138 |
AdvisorEngine – Option [Member] |  |  |  |  |  |  |
Impairments |  |  |  |  |  |  | 3,278
Thesys – Series Y Preferred [Member] |  |  |  |  |  |  |
Impairments |  |  |  |  | $ 3,080 |  | $ 3,829

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