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Preferred Stock - Series B-2 Convertible Preferred Stock (Details) - Series B-2 convertible preferred stock
1 Months Ended 9 Months Ended
Dec. 31, 2019
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Conversion ratio   190
Number of shares for which unexercised prepaid forward contracts are exercisable 1,236,223  
Shares issued in exchange of convertible preferred stock 695,127  
Shares Authorized 10,165 10,165
Conversion ratio   190
Value of shares issued on conversion | $   $ 153.90
Conversion Price (in dollars per share) | $ / shares   $ 0.81