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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Common stock issuance cost | $ 21,786 | $ 21,786 |
Series B Convertible Preferred Stock |  |  |
Convertible preferred stock, net of issuance cost |  |  | $ 165

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