XML 88 R71.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Note Receivables - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 29, 2017 | Jun. 30, 2018 | Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest rate | 5.00% | 5.00% | 5.00%
Percentage of interest rate increase at the event of default | 10.00% | 10.00% | 10.00%
Promissory note maturity date |  |  | Dec. 29, 2021
Interest income recognized |  | $ 421 | $ 840
AdvisorEngine [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Aggregate commitment amount | $ 30,000 |  |
Current funding amount |  | 27,000 | 27,000
Remaining commitment amount |  | 3,000 | 3,000
AdvisorEngine [Member] | Equity Option [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Aggregate commitment amount | 30,000 |  |
Fair value of option | $ 3,278 | $ 3,278 | $ 3,278

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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of investments accounted under the cost method. + References No definition available. + Details
Name: | us-gaap_CostMethodInvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument, interest rate, increase (decrease) on event of default. + References No definition available. + Details
Name: | wetf_DebtInstrumentInterestRateIncreaseDecreaseOnEventOfDefault
Namespace Prefix: | wetf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Notes and loans receivable aggregate commitment amount. + References No definition available. + Details
Name: | wetf_NotesAndLoansReceivableAggregateCommitmentAmount
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Notes and loans receivable current funding amount. + References No definition available. + Details
Name: | wetf_NotesAndLoansReceivableCurrentFundingAmount
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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
- Definition Paid-in-kind interest income. + References No definition available. + Details
Name: | wetf_PaidInKindInterestIncome
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wetf_AdvisorEngineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |