FAIR VALUE MEASUREMENTS (Q1) (Details) - USD ($)
|
3 Months Ended |
5 Months Ended |
12 Months Ended |
|
Mar. 31, 2021 |
Mar. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2020 |
Jun. 06, 2019 |
| Liabilities [Abstract] |
|
|
|
|
|
| Warrant liability |
$ 141,900,000
|
$ 13,065,000
|
$ 13,260,000
|
$ 63,680,000
|
$ 0
|
| Changes in Fair Value of Warrant Liabilities [Roll Forward] |
|
|
|
|
|
| Fair value |
63,680,000
|
13,260,000
|
17,905,000
|
13,260,000
|
|
| Change in valuation inputs or other assumptions |
78,220,000
|
(195,000)
|
(4,645,000)
|
50,420,000
|
|
| Fair value |
141,900,000
|
13,065,000
|
13,260,000
|
63,680,000
|
|
| Transfers into Level 3 |
0
|
|
|
0
|
|
| Transfers out of Level 3 |
0
|
|
|
0
|
|
| Public Warrants [Member] |
|
|
|
|
|
| Liabilities [Abstract] |
|
|
|
|
|
| Warrant liability |
88,000,000
|
4,875,000
|
5,000,000
|
41,000,000
|
0
|
| Changes in Fair Value of Warrant Liabilities [Roll Forward] |
|
|
|
|
|
| Fair value |
41,000,000
|
5,000,000
|
10,625,000
|
5,000,000
|
|
| Change in valuation inputs or other assumptions |
47,000,000
|
(125,000)
|
(5,625,000)
|
36,000,000
|
|
| Fair value |
88,000,000
|
4,875,000
|
5,000,000
|
41,000,000
|
|
| Private Placement Warrants [Member] |
|
|
|
|
|
| Liabilities [Abstract] |
|
|
|
|
|
| Warrant liability |
53,900,000
|
8,190,000
|
8,260,000
|
22,680,000
|
$ 0
|
| Changes in Fair Value of Warrant Liabilities [Roll Forward] |
|
|
|
|
|
| Fair value |
22,680,000
|
8,260,000
|
7,280,000
|
8,260,000
|
|
| Change in valuation inputs or other assumptions |
31,220,000
|
(70,000)
|
980,000
|
14,420,000
|
|
| Fair value |
53,900,000
|
8,190,000
|
8,260,000
|
22,680,000
|
|
| Recurring [Member] | Level 1 [Member] |
|
|
|
|
|
| Assets [Abstract] |
|
|
|
|
|
| Marketable securities held in Trust Account |
254,202,898
|
|
251,924,993
|
254,187,706
|
|
| Recurring [Member] | Level 1 [Member] | Public Warrants [Member] |
|
|
|
|
|
| Liabilities [Abstract] |
|
|
|
|
|
| Warrant liability |
88,000,000
|
|
5,000,000
|
41,000,000
|
|
| Changes in Fair Value of Warrant Liabilities [Roll Forward] |
|
|
|
|
|
| Fair value |
41,000,000
|
5,000,000
|
|
5,000,000
|
|
| Fair value |
88,000,000
|
|
5,000,000
|
41,000,000
|
|
| Recurring [Member] | Level 3 [Member] | Private Placement Warrants [Member] |
|
|
|
|
|
| Liabilities [Abstract] |
|
|
|
|
|
| Warrant liability |
53,900,000
|
|
8,260,000
|
22,680,000
|
|
| Changes in Fair Value of Warrant Liabilities [Roll Forward] |
|
|
|
|
|
| Fair value |
22,680,000
|
$ 8,260,000
|
|
8,260,000
|
|
| Fair value |
$ 53,900,000
|
|
$ 8,260,000
|
$ 22,680,000
|
|