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Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Apr. 08, 2019 | Mar. 31, 2019 | Feb. 20, 2019 | Dec. 31, 2018 | Mar. 12, 2018 | Dec. 31, 2017
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Convertible Preferred Stock to common stock upon closing of initial public offering (shares) | 31,557,107 | 31,557,107 |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, authorized (shares) | 0 | 0 |  |  | 31,557,107 |  |  |  |  |  | 24,449,177 |  |
Convertible preferred stock, par value (usd per share) | $ 0.00001 | $ 0.00001 |  |  | $ 0.00001 |  |  |  |  |  | $ 0.00001 |  |
Convertible preferred stock, outstanding (shares) | 0 | 0 | 31,557,107 | 31,557,107 | 31,557,107 | 31,557,107 | 28,595,471 |  | 24,449,177 |  | 24,445,555 |  | 15,671,730
Convertible preferred stock, issued (shares) | 0 | 0 |  |  | 31,557,107 |  |  |  |  |  | 24,445,555 |  |
Carrying Value | $ 0.0 | $ 0.0 | $ 480.2 | $ 480.2 | $ 480.2 | $ 480.2 | $ 355.2 |  | $ 180.8 |  | $ 180.8 |  | $ 60.4
Convertible preferred stock, liquidation preference | $ 0.0 | $ 0.0 |  |  | $ 480.8 |  |  |  |  |  | $ 180.8 |  |
Convertible preferred stock, common stock issuable upon conversion (shares) |  |  |  |  | 31,557,107 |  |  |  |  |  | 24,445,555 |  |
Series Seed Preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, authorized (shares) |  |  |  |  | 7,905,140 |  |  |  |  |  | 7,905,140 |  |
Convertible preferred stock, outstanding (shares) |  |  |  |  | 7,905,140 |  |  |  |  |  | 7,905,140 |  |
Convertible preferred stock, issued (shares) |  |  |  |  | 7,905,140 |  |  |  |  |  | 7,905,140 |  |
Carrying Value |  |  |  |  | $ 12.9 |  |  |  |  |  | $ 12.9 |  |
Convertible preferred stock, liquidation preference |  |  |  |  | $ 13.0 |  |  |  |  |  | $ 13.0 |  |
Convertible preferred stock, common stock issuable upon conversion (shares) |  |  |  |  | 7,905,140 |  |  |  |  |  | 7,905,140 |  |
Series A Preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, authorized (shares) |  |  |  |  | 3,328,774 |  |  |  |  |  | 3,328,774 |  |
Convertible preferred stock, outstanding (shares) |  |  |  |  | 3,328,774 |  |  |  |  |  | 3,328,774 |  |
Convertible preferred stock, issued (shares) |  |  |  |  | 3,328,774 |  |  |  |  |  | 3,328,774 |  |
Carrying Value |  |  |  |  | $ 14.0 |  |  |  |  |  | $ 14.0 |  |
Convertible preferred stock, liquidation preference |  |  |  |  | $ 13.6 |  |  |  |  |  | $ 13.6 |  |
Convertible preferred stock, common stock issuable upon conversion (shares) |  |  |  |  | 3,328,774 |  |  |  |  |  | 3,328,774 |  |
Series B Preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, authorized (shares) |  |  |  |  | 4,511,417 |  |  |  |  |  | 4,511,417 |  |
Convertible preferred stock, outstanding (shares) |  |  |  |  | 4,511,417 |  |  |  |  |  | 4,511,417 |  |
Convertible preferred stock, issued (shares) |  |  |  |  | 4,511,417 |  |  |  |  |  | 4,511,417 |  |
Carrying Value |  |  |  |  | $ 34.1 |  |  |  |  |  | $ 34.1 |  |
Convertible preferred stock, liquidation preference |  |  |  |  | $ 34.1 |  |  |  |  |  | $ 34.1 |  |
Convertible preferred stock, common stock issuable upon conversion (shares) |  |  |  |  | 4,511,417 |  |  |  |  |  | 4,511,417 |  |
Series C Preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, authorized (shares) |  |  |  |  | 8,703,846 |  |  |  |  |  | 8,703,846 |  |
Convertible preferred stock, par value (usd per share) |  |  |  |  |  |  |  |  |  | $ 0.00001 |  | $ 0.00001 |
Convertible preferred stock, outstanding (shares) |  |  |  |  | 8,703,846 |  |  |  |  |  | 8,700,224 |  |
Convertible preferred stock, issued (shares) |  |  |  |  | 8,703,846 |  |  |  |  |  | 8,700,224 |  |
Carrying Value |  |  |  |  | $ 119.8 |  |  |  |  |  | $ 119.8 |  |
Convertible preferred stock, liquidation preference |  |  |  |  | $ 120.1 |  |  |  |  |  | $ 120.1 |  |
Convertible preferred stock, common stock issuable upon conversion (shares) |  |  |  |  | 8,703,846 |  |  |  |  |  | 8,700,224 |  |
Series D Preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, authorized (shares) |  |  |  |  | 7,107,930 |  |  | 7,107,930 |  |  |  |  |
Convertible preferred stock, par value (usd per share) |  |  |  |  |  |  |  | $ 0.00001 |  |  |  |  |
Convertible preferred stock, outstanding (shares) |  |  |  |  | 7,107,930 |  |  |  |  |  |  |  |
Convertible preferred stock, issued (shares) |  |  |  |  | 7,107,930 |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  | $ 299.4 |  |  |  |  |  |  |  |
Convertible preferred stock, liquidation preference |  |  |  |  | $ 300.0 |  |  |  |  |  |  |  |
Convertible preferred stock, common stock issuable upon conversion (shares) |  |  |  |  | 7,107,930 |  |  |  |  |  |  |  |

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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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- Definition The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References No definition available. + Details
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