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RELATED PARTY TRANSACTIONS, Promissory Note, Administrative Support Agreement and Related Party Loans (FY) (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 17, 2020 | Sep. 14, 2020 | Jul. 03, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Related Party Transactions [Abstract] |  |  |  |  |
Repayment of debt to related party |  |  |  |  | $ 250,000
Sponsor [Member] | Promissory Note [Member] |  |  |  |  |
Related Party Transactions [Abstract] |  |  |  |  |
Repayment of debt to related party | $ 250,000 |  |  |  |
Sponsor [Member] | Promissory Note [Member] | Maximum [Member] |  |  |  |  |
Related Party Transactions [Abstract] |  |  |  |  |
Related party transaction |  |  | $ 250,000 |  |
Sponsor [Member] | Administrative Support Agreement [Member] |  |  |  |  |
Related Party Transactions [Abstract] |  |  |  |  |
Related party expense |  |  |  | $ 30,000 | 40,000
Sponsor [Member] | Administrative Support Agreement [Member] | Maximum [Member] |  |  |  |  |
Related Party Transactions [Abstract] |  |  |  |  |
Related party transaction |  | $ 10,000 |  |  |
Sponsor or an Affiliate of the Sponsor, or Certain of the Company's Officers and Directors [Member] | Working Capital Loans [Member] |  |  |  |  |
Related Party Transactions [Abstract] |  |  |  |  |
Related party transaction |  |  |  |  | $ 1,500,000
Share price (in dollars per share) |  |  |  |  | $ 1.00
Promissory note, outstanding |  |  |  | $ 0 | $ 0

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- Definition The amount for notes payable (written promise to pay), due to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + 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 -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 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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + 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 (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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