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Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity - Mezzanine Equity - USD ($) $ in Thousands | Series X redeemable convertible preferred stock | Total
--- | --- | ---
Mezzanine equity, beginning balance at Dec. 31, 2020 | $ 0 |
Mezzanine equity, beginning balance (in shares) at Dec. 31, 2020 | 0 |
Series X redeemable convertible preferred stock |  |
Issuance of preferred stock in a private offering of public equity, net of issuance costs | $ 84,696 |
Issuance of preferred stock in a private offering of public equity, net of issuance costs (in shares) | 35,573 |
Issuance of preferred stock and common stock upon acquisition of Quellis | $ 156,185 |
Issuance of preferred stock and common stock upon acquisition of Quellis (in shares) | 50,504 |
Mezzanine equity, ending balance at Mar. 31, 2021 | $ 240,881 |
Mezzanine equity, ending balance (in shares) at Mar. 31, 2021 | 86,077 |
Series X redeemable convertible preferred stock |  |
Reclassification of preferred stock to permanent equity | $ (240,881) |
Issuance of common stock upon the conversion of preferred stock |  | $ 1
Reclassification of preferred stock to permanent equity (in shares) | (86,077) |

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