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Convertible Preferred Stock (Tables)
 9 Months Ended
Sep. 30, 2020
Temporary Equity Disclosure [Abstract]  
Convertible preferred stock
As of December 31, 2019, preferred stock consisted of the following ($ in millions, except for share amounts):
As of
December 31, 2019
Preferred
Stock
Authorized		Preferred
Stock
Issued and
Outstanding		Carrying
Value		Liquidation
Preference		Common Stock
Issuable Upon
Conversion
Series Seed Preferred stock7,905,140 7,905,140 $12.9 $13.0 7,905,140 
Series A Preferred stock3,328,774 3,328,774 14.0 13.6 3,328,774 
Series B Preferred stock4,511,417 4,511,417 34.1 34.1 4,511,417 
Series C Preferred stock8,703,846 8,703,846 119.8 120.1 8,703,846 
Series D Preferred stock7,107,930 7,107,930 299.4 300.0 7,107,930 
31,557,107 31,557,107 $480.2 $480.8 31,557,107