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INCOME TAX - Reconciliation of federal income tax rate (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
INCOME TAX |  |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 21.00% | 21.00%
State taxes, net of federal tax benefit |  |  | 0.00% | 0.00%
Transaction costs attributable to Initial Public Offering |  |  | 0.00% | (1.80%)
Loss on conversion option liability |  |  | (0.50%) | 0.00%
Loss on warrant liability |  |  | (6.30%) | (28.50%)
Loss on Prosus agreement |  |  | (14.70%) | 0.00%
Valuation allowance |  |  | (0.20%) | 0.00%
Income tax provision |  |  | (0.70%) | (9.30%)

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