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Fair Value Measurements - Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Into Level 3 (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
2017 Warrant |  |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Into Level3 [Line Items] |  |  |  |
Balance-beginning of period | $ 1,035 | $ 808 | $ 808 | $ 723
Additions |  |  |  | 0
Measurement adjustments | 6,378 | 147 | 227 | 85
Balance-end of period | 7,413 | 955 | 1,035 | 808
2018 Warrant |  |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Into Level3 [Line Items] |  |  |  |
Balance-beginning of period | 87 | 58 | 58 |
Measurement adjustments | 766 | 17 | 29 | 58
Balance-end of period | 853 | 75 | 87 | 58
2020 Warrants |  |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Into Level3 [Line Items] |  |  |  |
Balance-beginning of period |  |  |  |
Additions | 1,728 |  |  |
Measurement adjustments | 5,418 |  |  |
Balance-end of period | 7,146 |  |  |
SAFEs [Member] |  |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Into Level3 [Line Items] |  |  |  |
Balance-beginning of period | $ 0 | 122,588 | 122,588 | 43,775
Additions |  | 37,379 | 37,379 | 66,467
Exercise or conversion |  | (184,182) | (184,182) |
Measurement adjustments |  | 24,215 | 24,215 | 12,345
Balance-end of period |  |  | $ 0 | $ 122,588

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Into Level3 + References No definition available. + Details
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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Exercise Or Conversion + References No definition available. + Details
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- Definition Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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