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Convertible Preferred Stock and Preferred Stock Warrants (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Convertible Preferred Stock |  |
Schedule of balance sheet and preferred stock | As of December 31, 2019, preferred stock consisted of the following ($ in millions, except for share amounts): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | December 31, 2019
​ |  | ​ |  | Preferred Stock |  | ​ | ​ |  | ​ | ​ |  | Common Stock
​ | ​ | Preferred | ​ | Issued and | ​ | Carrying | ​ | Liquidation | ​ | Issuable Upon
​ | ​ | Stock Authorized | ​ | Outstanding | ​ | Value | ​ | Preference | ​ | Conversion
Series Seed Preferred stock |  | 7,905,140 |  | 7,905,140 | ​ | $ | 12.9 | ​ | $ | 13.0 |  | 7,905,140
Series A Preferred stock |  | 3,328,774 |  | 3,328,774 | ​ |  | 14.0 | ​ |  | 13.6 |  | 3,328,774
Series B Preferred stock |  | 4,511,417 |  | 4,511,417 | ​ |  | 34.1 | ​ |  | 34.1 |  | 4,511,417
Series C Preferred stock |  | 8,703,846 |  | 8,703,846 | ​ |  | 119.8 | ​ |  | 120.1 |  | 8,703,846
Series D Preferred stock |  | 7,107,930 |  | 7,107,930 | ​ |  | 299.4 | ​ |  | 300.0 |  | 7,107,930
​ |  | 31,557,107 |  | 31,557,107 | ​ | $ | 480.2 | ​ | $ | 480.8 |  | 31,557,107
| As of each balance sheet date, preferred stock consisted of the following ($ in millions, except for share amounts): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2018
​ | ​ | ​ | ​ | Preferred | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Preferred | ​ | Stock | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Common Stock
​ | ​ | Stock | ​ | Issued and | ​ | Carrying | ​ | Liquidation | ​ | Issuable Upon
​ |  | Authorized |  | Outstanding |  | Value |  | Preference |  | Conversion
Series Seed Preferred stock |  | 7,905,140 |  | 7,905,140 | ​ | $ | 12.9 | ​ | $ | 13.0 |  | 7,905,140
Series A Preferred stock |  | 3,328,774 |  | 3,328,774 | ​ |  | 14.0 | ​ |  | 13.6 |  | 3,328,774
Series B Preferred stock |  | 4,511,417 |  | 4,511,417 | ​ |  | 34.1 | ​ |  | 34.1 |  | 4,511,417
Series C Preferred Stock |  | 8,703,846 |  | 8,700,224 | ​ |  | 119.8 | ​ |  | 120.1 |  | 8,700,224
​ |  | 24,449,177 |  | 24,445,555 | ​ | $ | 180.8 | ​ | $ | 180.8 |  | 24,445,555
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ | ​ | ​ | ​ | Preferred | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Preferred | ​ | Stock | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Common Stock
​ | ​ | Stock | ​ | Issued and | ​ | Carrying | ​ | Liquidation | ​ | Issuable Upon
​ |  | Authorized |  | Outstanding |  | Value |  | Preference |  | Conversion
Series Seed Preferred stock |  | 7,905,140 |  | 7,905,140 | ​ | $ | 12.9 | ​ | $ | 13.0 |  | 7,905,140
Series A Preferred stock |  | 3,328,774 |  | 3,328,774 | ​ |  | 14.0 | ​ |  | 13.6 |  | 3,328,774
Series B Preferred stock |  | 4,511,417 |  | 4,511,417 | ​ |  | 34.1 | ​ |  | 34.1 |  | 4,511,417
Series C Preferred Stock |  | 8,703,846 |  | 8,703,846 | ​ |  | 119.8 | ​ |  | 120.1 |  | 8,703,846
Series D Preferred Stock |  | 7,107,930 |  | 7,107,930 | ​ |  | 299.4 | ​ |  | 300.0 |  | 7,107,930
​ |  | 31,557,107 |  | 31,557,107 | ​ | $ | 480.2 | ​ | $ | 480.8 |  | 31,557,107

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- Definition Tabular disclosure of temporary 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. 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 + Details
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