Registration of securities issued in business combination transactions

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

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net income (loss) per share (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
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 $ 59,701 $ 2,250,075         $ 2,516,752 $ 6,639,430
Unrealized gain (loss) on investments held in Trust Account $ 1,332 $ (20,917)       $ 45,988 $ 1,276 45,988
Denominator: Weighted average Class A common stock subject to possible redemption                
Basic and diluted weighted average shares outstanding 32,537,498 25,224,075       21,438,529 27,526,131  
Basic and diluted net income (loss) per share $ 0.00 $ 0.02            
Numerator: Net loss minus net earnings                
Net income (loss) $ 41,740,801 $ (8,823,514) $ (53,585,867) $ (16,497,280) $ (25,340,816) $ (14,682,592) $ (72,459,185) $ (14,682,592)
Class A Common Stock Subject to Possible Redemption [Member]                
Numerator: Earnings allocable to Class A common stock subject to possible redemption                
Interest income 50,107 1,956,529       6,410,370 1,959,040  
Unrealized gain (loss) on investments held in Trust Account 1,118 (18,188)       44,401 993  
Less: Company's portion available to be withdrawn to pay taxes (43,998) (395,474)       (1,344,722) (534,953)  
Less: Company's portion available to be withdrawn for working capital purposes $ (7,227) (217,385)       $ (241,375) $ (194,600)  
Net income allocable to Class A common stock subject to possible redemption   $ 1,325,482            
Denominator: Weighted average Class A common stock subject to possible redemption                
Basic and diluted weighted average shares outstanding 53,712,502 61,025,925       61,961,631 58,723,869  
Basic and diluted net income (loss) per share $ 0.00 $ 0.02       $ 0.08 $ 0.02  
Numerator: Net loss minus net earnings                
Net income (loss)           $ 4,868,674 $ 1,230,480  
Less: Income allocable to Class A common stock subject to possible redemption   $ (1,325,482)            
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   $ 1,325,482       $ 4,868,674 $ 1,230,480  
Denominator: Weighted average Class A common stock subject to possible redemption                
Basic and diluted weighted average shares outstanding 32,537,498 25,224,075       21,438,529 27,526,131  
Basic and diluted net income (loss) per share $ 1.28 $ (0.40)            
Numerator: Net loss minus net earnings                
Net income (loss) $ 41,740,801 $ (8,823,514)       $ (14,682,592) $ (72,459,185)  
Less: Income allocable to Class A common stock subject to possible redemption   (1,325,482)       (4,868,674) (1,230,480)  
Non-Redeemable Net Income Loss 41,740,801 (10,148,996)       (19,551,226) (73,689,665)  
Class B Common Stock [Member]                
Numerator: Net loss minus net earnings                
Net income (loss) $ 0 $ 0       $ 0 $ 0