XML 32 R74.htm IDEA: XBRL DOCUMENT
v3.19.3

Notes Receivables - Summary of Company's notes receivable (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Total | $ 32,368 | $ 28,722
Unsecured non-convertible note [Member] |  |
Total | 30,556 | $ 28,722
Unsecured convertible note [Member] |  |
Total | $ 1,812 |

X
- Definition Amount, after allowance for credit loss, of financing receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_NotesAndLoansReceivableNetNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=wetf_UnsecuredNonConvertibleNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=wetf_UnsecuredConvertibleNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |