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Stock-based Compensation - Summary of stock options (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |  |  |  |
Outstanding as of December 31, 2019 | 365,938 |  |  |
Granted | 921,721 | 366,988 |  |
Forfeited | (87,685) | (1,050) |  |
Outstanding as of September 30, 2020 | 1,199,974 | 365,938 |  |
Vested and exercisable as of September 30, 2020 |  |  | 59,538 | 26,035
Vested and expected to vest as of September 30, 2020 |  |  | 1,199,974 | 365,938
Outstanding as of December 31, 2019 | $ 22.73 |  |  |
Granted | 22.73 | $ 22.73 |  |
Forfeited | 22.73 | 22.73 |  |
Outstanding as of September 30, 2020 | 22.73 | 22.73 |  |
Vested and exercisable as of September 30, 2020 | $ 22.73 | $ 22.73 | $ 22.73 | $ 22.73
Vested and expected to vest as of September 30, 2020 |  |  | $ 22.73 | $ 22.73
Outstanding as of December 31, 2019 | 9 years 3 months 25 days | 9 years 9 months 3 days |  |
Granted |  | 9 years 9 months 3 days |  |
Forfeited |  | 9 years 7 months 9 days |  |
Outstanding as of September 30, 2020 | 9 years 3 months 25 days | 9 years 9 months 3 days |  |
Vested and exercisable as of September 30, 2020 | 9 years 21 days | 9 years 9 months |  |
Vested and expected to vest as of September 30, 2020 | 9 years 3 months 25 days | 9 years 9 months 3 days |  |
Outstanding as of December 31, 2019 | $ 22 | $ 22 |  |
Outstanding as of September 30, 2020 | $ 141,657 | $ 22 |  |
Vested and exercisable as of September 30, 2020 |  |  | $ 7,028 | $ 2
Vested and expected to vest as of September 30, 2020 |  |  | $ 141,657 | $ 22

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- Definition Share based compensation by share based payment arrangement options granted weighted average remaining contractual term. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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