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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

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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