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v3.21.1

FAIR VALUE MEASUREMENTS, Change in Level 3 Fair Value of Warrant Liabilities (FY) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2020
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Change in fair value of warrant liabilities | $ 5,068,000 | $ 181,000 | $ 181,000 | $ (7,240,000)
Warrant Liabilities [Member] |  |  |  |
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Level 3 - Beginning balance | 0 | 0 |  | 0
Initial measurement on September 17, 2020 |  |  |  | 16,290,000
Change in fair value of warrant liabilities |  |  |  | 7,240,000
Level 3 - Ending balance |  |  |  | 0
Warrant Liabilities [Member] | Level 2 [Member] |  |  |  |
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Transfer from Level 3 |  |  |  | (8,580,000)
Warrant Liabilities [Member] | Level 1 [Member] |  |  |  |
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Transfer from Level 3 |  |  |  | (14,950,000)
Warrant Liabilities [Member] | Private Placement Warrants [Member] |  |  |  |
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Level 3 - Beginning balance | 0 | 0 |  | 0
Initial measurement on September 17, 2020 |  |  |  | 5,940,000
Change in fair value of warrant liabilities |  |  |  | 2,640,000
Level 3 - Ending balance |  |  |  | 0
Warrant Liabilities [Member] | Private Placement Warrants [Member] | Level 2 [Member] |  |  |  |
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Transfer from Level 3 |  |  |  | (8,580,000)
Warrant Liabilities [Member] | Private Placement Warrants [Member] | Level 1 [Member] |  |  |  |
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Transfer from Level 3 |  |  |  | 0
Warrant Liabilities [Member] | Public Warrants [Member] |  |  |  |
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Level 3 - Beginning balance | $ 0 | $ 0 |  | 0
Initial measurement on September 17, 2020 |  |  |  | 10,350,000
Change in fair value of warrant liabilities |  |  |  | 4,600,000
Level 3 - Ending balance |  |  |  | 0
Warrant Liabilities [Member] | Public Warrants [Member] | Level 2 [Member] |  |  |  |
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Transfer from Level 3 |  |  |  | 0
Warrant Liabilities [Member] | Public Warrants [Member] | Level 1 [Member] |  |  |  |
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Transfer from Level 3 |  |  |  | $ (14,950,000)

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