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Redeemable Preferred Stock - Activity (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Increase (Decrease) in Temporary Equity [Roll Forward]  
Balance at December 31, 2019 $ 19,602
Deemed dividend on redeemable convertible preferred stock 968
Balance at June 30, 2020 $ 20,570