XML 74 R58.htm IDEA: XBRL DOCUMENT
v3.21.2

Cash and Cash Equivalents - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Cash equivalents | $ 20,143 |  | $ 660 |  |
Total cash and cash equivalents | 127,924 | $ 73,425 |  | $ 63,561 | $ 74,972
Two Financial Institutions [Member] |  |  |  |  |
Cash and cash equivalents | 105,885 | 70,911 |  |  |
International Subsidiaries [Member] |  |  |  |  |
Minimum level of regulatory net capital | $ 12,384 | $ 10,745 |  |  |

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CashAndCashEquivalentsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CashEquivalentsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash and cash equivalents held at two financial institutions + References No definition available. + Details
Name: | wetf_CashAndCashEquivalentsHeldAtTwoFinancialInstitutions
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum regulatory net liquid asset requirement for certain of the Company's international subsidiaries. + References No definition available. + Details
Name: | wetf_NetLiquidAssetsInternationalSubsidiaryRegulatoryCapitalRequirements
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=wetf_TwoFinancialInstitutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wetf_InternationalSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |