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Convertible Preferred Stock - Summary of Beneficial conversion Feature And Commitment Date of Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Temporary Equity [Line Items] |  |
Fair value of the Common Stock | $ 64.96 | $ 64.96
BCF | $ 11,529,000 | $ 5,282,000
Series A | Beneficial Conversion Commitment Date One |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Cash | Cash
Effective Conversion Price | $ 43.30 | $ 43.30
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 648,069 | 648,069
Series A | Beneficial Conversion Commitment Date Two |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of SAFEs | Settlement of SAFEs
Effective Conversion Price | $ 43.30 | $ 43.30
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 75,165 | 75,165
Series A | Beneficial Conversion Commitment Date Three |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Cash | Cash
Effective Conversion Price | $ 43.30 | $ 43.30
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 692,778 | 692,778
Series A | Beneficial Conversion Commitment Date Four |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Cash | Cash
Effective Conversion Price | $ 43.30 | $ 43.30
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 11,546 | 11,546
Series A | Beneficial Conversion Commitment Date Five |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) |  | Cash
Effective Conversion Price |  | $ 43.30
Fair value of the Common Stock |  | $ 18.59
Number of Shares Issuable upon Conversion |  | 233,281
Series A-1 |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of SAFEs | Settlement of SAFEs
Effective Conversion Price | $ 15.31 | $ 15.31
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 163,306 | 163,306
BCF | $ 536,000 | $ 536,000
Series A-2 |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of SAFEs | Settlement of SAFEs
Effective Conversion Price | $ 15.12 | $ 15.12
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 1,322,780 | 1,322,780
BCF | $ 4,590,000 | $ 4,590,000
Series A-3 |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of SAFEs | Settlement of SAFEs
Effective Conversion Price | $ 17.89 | $ 17.89
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 223,548 | 223,548
BCF | $ 156,000 | $ 156,000
Series A-4 |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of SAFEs | Settlement of SAFEs
Effective Conversion Price | $ 20.07 | $ 20.07
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 49,827 | 49,827
Series A-5 |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of SAFEs | Settlement of SAFEs
Effective Conversion Price | $ 20.15 | $ 20.15
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 124,068 | 124,068
Series A-6 |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of SAFEs | Settlement of SAFEs
Effective Conversion Price | $ 30.31 | $ 30.31
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 247,420 | 247,420
Series A-7 |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of SAFEs | Settlement of SAFEs
Effective Conversion Price | $ 34.64 | $ 34.64
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 1,459,656 | 1,459,656
Series A-8 |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of SAFEs | Settlement of SAFEs
Effective Conversion Price | $ 36.81 | $ 36.81
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 385,777 | 385,777
Series A-9 |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of SAFEs | Settlement of SAFEs
Effective Conversion Price | $ 38.97 | $ 38.97
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 748,674 | 748,674
Series A-10 |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of SAFEs | Settlement of SAFEs
Effective Conversion Price | $ 41.14 | $ 41.14
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 252,801 | 252,801
Series A-11 |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Settlement of Note | Settlement of Note
Effective Conversion Price | $ 24.30 | $ 24.30
Fair value of the Common Stock | $ 18.59 | $ 18.59
Number of Shares Issuable upon Conversion | 317,404 | 317,404
Series X |  |
Temporary Equity [Line Items] |  |
Type of Consideration received (cash or settlement of other instruments) | Cash | Cash
Effective Conversion Price | $ 135.79 | $ 135.79
Fair value of the Common Stock | $ 140.78 | $ 140.78
Number of Shares Issuable upon Conversion | 1,251,971 | 1,251,971
BCF | $ 6,247,000 | $ 6,247,000

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