SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Net Income (Loss) Per Ordinary Share (Q1) (Details) - USD ($)
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3 Months Ended |
4 Months Ended |
6 Months Ended |
7 Months Ended |
9 Months Ended |
12 Months Ended |
Mar. 31, 2021 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Sep. 30, 2019 |
Sep. 30, 2019 |
Jun. 30, 2020 |
Dec. 31, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Numerator: Net Loss minus Net Earnings [Abstract] |
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| Interest income |
$ 29,681
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$ 932,037
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$ 1,812,577
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$ 2,257,985
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| Unrealized gain on investments held in Trust Account |
0
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1,152,686
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112,416
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4,728
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| Net (loss) income |
(78,928,074)
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$ (1,418,960)
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$ (3,146,809)
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1,822,107
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$ (817,468)
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$ (822,468)
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$ (1,324,702)
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5,352,568
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$ (2,743,662)
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$ (822,468)
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(52,021,521)
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$ 5,352,568
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| Net income |
$ (11,092)
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(1,976,734)
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$ (1,827,973)
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$ (1,548,374)
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| Class A Ordinary Shares [Member] |
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| Net Income (Loss) per Ordinary Share [Abstract] |
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| Shares excluded in calculation of diluted loss per share (in shares) |
19,500,000
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19,500,000
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19,500,000
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| Numerator: Net Loss minus Net Earnings [Abstract] |
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| Interest income |
$ 11,092
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883,757
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| Unrealized gain on investments held in Trust Account |
0
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1,092,977
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| Net income |
$ 11,092
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$ 1,976,734
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| Denominator: Weighted Average Non-Redeemable Ordinary Shares [Abstract] |
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| Basic weighted average shares outstanding (in shares) |
17,108,013
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22,424,313
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| Diluted weighted average shares outstanding (in shares) |
17,108,013
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22,424,313
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| Basic net (loss) income per share (in dollars per share) |
$ 0
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$ 0.09
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| Diluted net (loss) income per share (in dollars per share) |
$ 0
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$ 0.09
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| Class B Ordinary Shares [Member] |
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| Numerator: Net Loss minus Net Earnings [Abstract] |
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| Net (loss) income |
$ (78,928,074)
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$ 1,822,107
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| Non-Redeemable Net Loss |
$ (78,939,166)
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$ (154,627)
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| Denominator: Weighted Average Non-Redeemable Ordinary Shares [Abstract] |
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| Basic weighted average shares outstanding (in shares) |
14,141,750
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8,825,687
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| Diluted weighted average shares outstanding (in shares) |
14,141,750
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8,825,687
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| Basic net (loss) income per share (in dollars per share) |
$ (5.58)
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$ (0.02)
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| Diluted net (loss) income per share (in dollars per share) |
$ (5.58)
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$ (0.02)
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