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Redeemable Preferred Stock - Activity (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Increase (Decrease) in Temporary Equity [Roll Forward]  
Balance at December 31, 2019 $ 19,602
Deemed dividend on redeemable convertible preferred stock 1,442
Fees paid on issuance of preferred stock (3)
Balance at September 30, 2020 $ 21,041