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Notes Payable to Members (FY) (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) Notes Member	Dec. 31, 2019 USD ($)
Notes Payable to Members [Abstract]
Number of notes to pay in connection with purchase of Weedmaps	4
Number of majority related parties entitled to receive notes payable | Member	2
Number of notes paid off in full in prior periods	3
Principal balance | $	$ 205,324	$ 205,324
Notes payable interest rate	0.00%

X

- Definition

Reflects the effective interest rate as of the balance sheet date on interest-bearing notes payables.

+ References

No definition available.

+ Details

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Namespace Prefix:	maps_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of majority related parties entitled to receive notes payable from company in connections with subsidiary purchase.

+ References

No definition available.

+ Details

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Namespace Prefix:	maps_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of notes were paid of in full related to purchase of subsidiary.

+ References

No definition available.

+ Details

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Namespace Prefix:	maps_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of notes assumed to payable to members in connection with subsidiary purchase.

+ References

No definition available.

+ Details

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Namespace Prefix:	maps_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

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

X

- Definition

The amount for notes payable (written promise to pay), due to related parties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.17)
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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Balance Type:	credit
Period Type:	instant