RELATED PARTY TRANSACTIONS, Administrative Services Agreement (Q1) (Details) - Sponsor [Member] - Administrative Services Agreement [Member] - USD ($) |
3 Months Ended | 7 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
Aug. 07, 2019 |
Mar. 31, 2021 |
Dec. 31, 2019 |
Dec. 31, 2020 |
|
| Related Party Transactions [Abstract] | ||||
| Fees incurred | $ 60,000 | $ 92,903 | $ 240,000 | |
| Accrued Expenses [Member] | ||||
| Related Party Transactions [Abstract] | ||||
| Fees payable | $ 60,000 | $ 82,228 | $ 279,879 | |
| Maximum [Member] | ||||
| Related Party Transactions [Abstract] | ||||
| Monthly related party fee | $ 20,000 |