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Convertible Preferred Stock - Summary of original issue price and liquidation value of convertible preferred stock (Details) - Preferred Stock [Member] - $ / shares | Sep. 30, 2020 | Dec. 31, 2019
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Temporary Equity [Line Items] |  |
Temporary equity shares authorised |  | 7,537,269
Temporary Equity, Shares Issued |  | 6,956,100
Temporary Equity, Shares Outstanding |  | 6,956,100
Series A |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 2,228,361 | 2,228,361
Temporary Equity, Shares Issued | 1,660,839 | 1,660,839
Temporary Equity, Shares Outstanding | 1,660,839 | 1,660,839
Temporary Equity, Liquidation Preference Per Share | $ 43.30 | $ 43.30
Series A-1 |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 163,306 | 163,306
Temporary Equity, Shares Issued | 163,306 | 163,306
Temporary Equity, Shares Outstanding | 163,306 | 163,306
Temporary Equity, Liquidation Preference Per Share | $ 15.31 | $ 15.31
Series A-2 |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 1,322,780 | 1,322,780
Temporary Equity, Shares Issued | 1,322,780 | 1,322,780
Temporary Equity, Shares Outstanding | 1,322,780 | 1,322,780
Temporary Equity, Liquidation Preference Per Share | $ 15.12 | $ 15.12
Series A-3 |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 223,548 | 223,548
Temporary Equity, Shares Issued | 223,548 | 223,548
Temporary Equity, Shares Outstanding | 223,548 | 223,548
Temporary Equity, Liquidation Preference Per Share | $ 17.89 | $ 17.89
Series A-4 |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 49,827 | 49,827
Temporary Equity, Shares Issued | 49,827 | 49,827
Temporary Equity, Shares Outstanding | 49,827 | 49,827
Temporary Equity, Liquidation Preference Per Share | $ 20.07 | $ 20.07
Series A-5 |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 137,715 | 137,715
Temporary Equity, Shares Issued | 124,068 | 124,068
Temporary Equity, Shares Outstanding | 124,068 | 124,068
Temporary Equity, Liquidation Preference Per Share | $ 20.15 | $ 20.15
Series A-6 |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 247,420 | 247,420
Temporary Equity, Shares Issued | 247,420 | 247,420
Temporary Equity, Shares Outstanding | 247,420 | 247,420
Temporary Equity, Liquidation Preference Per Share | $ 30.31 | $ 30.31
Series A-7 |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 1,459,656 | 1,459,656
Temporary Equity, Shares Issued | 1,459,656 | 1,459,656
Temporary Equity, Shares Outstanding | 1,459,656 | 1,459,656
Temporary Equity, Liquidation Preference Per Share | $ 34.64 | $ 34.64
Series A-8 |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 385,777 | 385,777
Temporary Equity, Shares Issued | 385,777 | 385,777
Temporary Equity, Shares Outstanding | 385,777 | 385,777
Temporary Equity, Liquidation Preference Per Share | $ 36.81 | $ 36.81
Series A-9 |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 748,674 | 748,674
Temporary Equity, Shares Issued | 748,674 | 748,674
Temporary Equity, Shares Outstanding | 748,674 | 748,674
Temporary Equity, Liquidation Preference Per Share | $ 38.97 | $ 38.97
Series A-10 |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 252,801 | 252,801
Temporary Equity, Shares Issued | 252,801 | 252,801
Temporary Equity, Shares Outstanding | 252,801 | 252,801
Temporary Equity, Liquidation Preference Per Share | $ 41.14 | $ 41.14
Series A-11 |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 317,404 | 317,404
Temporary Equity, Shares Issued | 317,404 | 317,404
Temporary Equity, Shares Outstanding | 317,404 | 317,404
Temporary Equity, Liquidation Preference Per Share | $ 5.27 | $ 5.27
Series X |  |
Temporary Equity [Line Items] |  |
Temporary equity shares authorised | 1,472,905 |
Temporary Equity, Shares Issued | 1,251,971 |
Temporary Equity, Shares Outstanding | 1,251,971 |
Temporary Equity, Liquidation Preference Per Share | $ 135.79 |

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- Definition The per share 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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