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Private Placement (Details) - USD ($)
1 Months Ended 2 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2020
Dec. 31, 2019
Sep. 30, 2020
Jun. 12, 2018
Private Placement, Disclosure [Line Items]          
Number of warrants issued         300,000
Social Capital Hedosophia Holdings Corp. II          
Private Placement, Disclosure [Line Items]          
Aggregate purchase price       $ 9,200,000  
Social Capital Hedosophia Holdings Corp. II | Private placement | Common Class A          
Private Placement, Disclosure [Line Items]          
Number of shares called for by each public warrant (in shares) 1 1 1    
Exercise price of warrants $ 11.50 $ 11.50 $ 11.50    
Social Capital Hedosophia Holdings Corp. II | Private placement | Sponsor          
Private Placement, Disclosure [Line Items]          
Number of warrants issued 6,133,333 6,133,333 6,133,333    
Issue price of warrants (in dollars per share) $ 1.50 $ 1.50 $ 1.50    
Aggregate purchase price $ 9,200,000 $ 9,200,000 $ 9,200,000