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v3.21.2

Subsequent Events (FY) (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Dec. 10, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Subsequent Event [Line Items] |  |  |
Proceeds from business combination |  | $ 79,969 | $ 0
Cash held-in-trust |  | 254,203 |
Consideration received on transaction |  | $ 325,000 |
Silver Spike |  |  |
Subsequent Event [Line Items] |  |  |
Proceeds from business combination | $ 575,000 |  |
Cash held-in-trust | 250,000 |  |
Consideration received on transaction | $ 325,000 |  |

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- Definition Cash Acquired Through Reverse Recapitalization + References No definition available. + Details
Name: | maps_CashAcquiredThroughReverseRecapitalization
Namespace Prefix: | maps_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds From Reverse Recapitalization Transaction + References No definition available. + Details
Name: | maps_ProceedsFromReverseRecapitalizationTransaction
Namespace Prefix: | maps_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfPrivatePlacement
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=maps_SilverSpikeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |