Registration of securities issued in business combination transactions

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net loss per common share (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net loss per common share (Details) - USD ($)
 9 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Numerator: Earnings allocable to Class A common stock subject to possible redemption      
Interest income   $ 2,516,752 $ 6,639,430
Unrealized gain (loss) on marketable securities held in Trust Account $ 45,988 1,276 45,988
Net income allocable to Class A common stock subject to possible redemption $ 4,693,042 $ 1,124,364 4,693,042
Denominator: Weighted average Class A common stock subject to possible redemption      
Basic and diluted weighted average shares outstanding, Class A common stock subject to possible redemption 18,180,430 19,657,411  
Numerator: Net loss minus net earnings      
Net income $ 4,693,042 $ 1,124,364 $ 4,693,042
Denominator: Weighted Average Non-Redeemable Common Stock      
Basic and diluted weighted average shares outstanding, Non-redeemable common stock 18,180,430 19,657,411  
Basic and diluted net loss per share, Non-redeemable common stock $ (0.01) $ (0.02)  
Class A Common Stock Subject to Possible Redemption [Member]      
Numerator: Earnings allocable to Class A common stock subject to possible redemption      
Interest income $ 6,410,370 $ 2,428,414  
Unrealized gain (loss) on marketable securities held in Trust Account 44,401 1,231  
Less: Company's portion available to be withdrawn to pay taxes (1,344,722) (663,124)  
Less: Company's portion available to be withdrawn for working capital purposes (241,375) (241,225)  
Net income allocable to Class A common stock subject to possible redemption $ 4,868,674 $ 1,525,296  
Denominator: Weighted average Class A common stock subject to possible redemption      
Basic and diluted weighted average shares outstanding, Class A common stock subject to possible redemption 66,631,839 66,592,589  
Basic and diluted net income per share, Class A common stock subject to possible redemption $ 0.07 $ 0.02  
Numerator: Net loss minus net earnings      
Net income $ 4,868,674 $ 1,525,296  
Denominator: Weighted Average Non-Redeemable Common Stock      
Basic and diluted weighted average shares outstanding, Non-redeemable common stock 66,631,839 66,592,589  
Non-Redeemable Common Stock [Member]      
Numerator: Earnings allocable to Class A common stock subject to possible redemption      
Net income allocable to Class A common stock subject to possible redemption $ 4,693,042 $ 1,124,364  
Denominator: Weighted average Class A common stock subject to possible redemption      
Basic and diluted weighted average shares outstanding, Class A common stock subject to possible redemption 18,180,430 19,657,411  
Numerator: Net loss minus net earnings      
Net income $ 4,693,042 $ 1,124,364  
Less: Income attributable to Class A common stock subject to possible redemption (4,868,674) (1,525,296)  
Non-redeemable net loss $ (175,632) $ (400,932)  
Denominator: Weighted Average Non-Redeemable Common Stock      
Basic and diluted weighted average shares outstanding, Non-redeemable common stock 18,180,430 19,657,411  
Basic and diluted net loss per share, Non-redeemable common stock $ (0.01) $ (0.02)  
Class B Common Stock [Member]      
Numerator: Earnings allocable to Class A common stock subject to possible redemption      
Net income allocable to Class A common stock subject to possible redemption $ 0 $ 0  
Numerator: Net loss minus net earnings      
Net income $ 0 $ 0