XML 102 R85.htm IDEA: XBRL DOCUMENT v3.10.0.1

Variable Interest Entity - Additional Information (Detail) $ in Thousands	Jun. 30, 2018 USD ($)
AdvisorEngine [Member]
Variable Interest Entity [Line Items]
Remaining commitment amount	$ 3,000

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Notes and loans receivable remaining commitment amount.

+ References

No definition available.

+ Details

Name:	wetf_NotesAndLoansReceivableRemainingCommitmentAmount
Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wetf_AdvisorEngineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: