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Convertible Preferred Stock - Additional Information (Details) - USD ($) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jul. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 24, 2020 | Jun. 24, 2019
Temporary Equity [Line Items] |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  | $ 68,666,000 | $ 0 |  |
Share Price | $ 64.96 |  | $ 64.96 |  | $ 64.96 |  |  |
Convertible Preferred Stock Shares Issued Upon Conversion Value |  |  | $ 11,529,000,000 |  | $ 5,282,000,000 |  |  |
Minimum |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |
Share Price | $ 22.80 |  | $ 22.80 |  | $ 17.38 |  |  |
Proceeds from Issuance Initial Public Offering |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |
Temporary equity shares authorised | 7,537,269 |  | 7,537,269 |  | 7,537,269 | 0 |  |
Temporary equity par or stated value per share | $ 0.00001 |  | $ 0.00001 |  | $ 0.00001 | $ 0.00001 |  | $ 0.00001
Temporary equity issued during the period shares |  | 244,827 |  | 1,585,674 | 1,585,674 |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  | $ 10,100,000 |  | $ 68,666,000 |  |  |  |
Temporary equity shares issued | 6,956,100 |  | 6,956,100 |  | 6,956,100 | 0 |  |
Temporary Equity, Shares Outstanding | 6,956,100 |  | 6,956,100 | 6,956,100 | 6,956,100 | 0 |  |
Payment of stock issuance costs |  | $ 591,000 |  |  |  |  |  |
Series X Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |
Temporary equity shares authorised | 1,472,905 |  | 1,472,905 |  | 0 |  |  |
Temporary equity par or stated value per share | $ 0.00001 |  | $ 0.00001 |  | $ 0.00001 |  | $ 0.00001 |
Temporary equity issued during the period shares | 1,251,971 |  | 1,251,971 |  |  |  |  |
Temporary equity issue price per share |  |  |  |  |  |  | $ 135.79 |
Proceeds from Issuance of Redeemable Convertible Preferred Stock | $ 170,000,000 |  | $ 170,000,000 |  | $ 170,000,000 |  |  |
Share Price | $ 140.78 |  | $ 140.78 |  | $ 140.78 |  |  |
Convertible Preferred Stock Shares Issued Upon Conversion Value |  |  | $ 6,247,000,000 |  | $ 6,247,000,000 |  |  |
Temporary equity shares issued | 1,251,971 |  | 1,251,971 |  | 0 |  |  |
Temporary Equity, Shares Outstanding | 1,251,971 |  | 1,251,971 |  | 0 |  |  |
Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |
Preferred Stock Dividend Rate Percentage |  |  | 6.00% |  | 6.00% |  |  |
Preferred Stock Dividends Declared Or Paid |  |  | $ 0 |  | $ 0 |  |  |
Preferred Stock, Conversion Basis |  |  | 1 to 1 |  |  |  |  |
Convertible Preferred Stock Shares Issued Upon Conversion Value |  |  | $ 6,250,000 | $ 5,280,000 | $ 5,300,000 |  |  |
Temporary equity shares issued |  |  |  |  |  | 0 |  |
Temporary Equity, Shares Outstanding |  |  |  |  |  | 0 |  |

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- Definition Temporary equity issue price per share. + References No definition available. + Details
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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition Describe the conversion features of preferred stock if preferred stock is convertible. That is, shares of preferred stock into which another convertible security was converted, or shares of preferred stock into which another class of preferred stock was converted. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Per share amount of par value or stated value of stock classified as 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. + References Reference 1: 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 Reference 2: 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 + Details
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