Annual report pursuant to Section 13 and 15(d)

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 ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
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 $ (8,823,514) $ (53,585,867) $ (16,497,280) $ (25,340,816) $ (14,682,592) $ (72,459,185) (14,682,592)
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         21,438,529 27,526,131  
Numerator: Net loss minus net earnings              
Net loss $ (8,823,514) $ (53,585,867) $ (16,497,280) $ (25,340,816) $ (14,682,592) $ (72,459,185) $ (14,682,592)
Denominator: Weighted Average Non-Redeemable Common Stock              
Basic and diluted weighted average shares outstanding, Non-redeemable common stock         21,438,529 27,526,131  
Basic and diluted net loss per share, Non-redeemable common stock         $ (0.91) $ (2.68)  
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 $ 1,959,040  
Unrealized gain (loss) on marketable securities held in Trust Account         44,401 993  
Less: Company's portion available to be withdrawn to pay taxes         (1,344,722) (534,953)  
Less: Company's portion available to be withdrawn for working capital purposes         (241,375) (194,600)  
Net income allocable to Class A common stock subject to possible redemption         $ 4,868,674 $ 1,230,480  
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         61,961,631 58,723,869  
Basic and diluted net income per share, Class A common stock subject to possible redemption         $ 0.08 $ 0.02  
Numerator: Net loss minus net earnings              
Net loss         $ 4,868,674 $ 1,230,480  
Denominator: Weighted Average Non-Redeemable Common Stock              
Basic and diluted weighted average shares outstanding, Non-redeemable common stock         61,961,631 58,723,869  
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         $ (14,682,592) $ (72,459,185)  
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         21,438,529 27,526,131  
Numerator: Net loss minus net earnings              
Net loss         $ (14,682,592) $ (72,459,185)  
Less: Income attributable to Class A common stock subject to possible redemption         (4,868,674) (1,230,480)  
Non-redeemable net loss         $ (19,551,226) $ (73,689,665)  
Denominator: Weighted Average Non-Redeemable Common Stock              
Basic and diluted weighted average shares outstanding, Non-redeemable common stock         21,438,529 27,526,131  
Basic and diluted net loss per share, Non-redeemable common stock         $ (0.91) $ (2.69)  
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 loss         $ 0 $ 0