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Fair Value Measurements - Schedule of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets: |  |  |
Assets | $ 117,130,000 | $ 6,659,000 |
Liabilities: |  |  |
Liabilities | 15,412,000 | 1,122,000 | $ 123,454,000
Quoted Prices in Active Markets (Level 1) |  |  |
Assets: |  |  |
Assets | 4,098,000 | 749,000 |
Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Assets | 111,782,000 | 5,910,000 |
Significant Other Unobservable Inputs (Level 3) |  |  |
Assets: |  |  |
Assets | 1,250,000 |  |
Liabilities: |  |  |
Liabilities | 15,412,000 | 1,122,000 | 123,454,000
Fair Value, Measurements, Recurring | Gores Metropoulos, Inc. |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments and cash held in Trust Account | 405,725,195 | 406,434,959 |
Assets: |  |  |
Assets | 405,725,195 | 406,434,959 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Gores Metropoulos, Inc. |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments and cash held in Trust Account | 405,725,195 | 406,434,959 |
Assets: |  |  |
Assets | 405,725,195 | 406,434,959 |
Commercial papers |  |  |
Assets: |  |  |
Assets | 61,594,000 | 3,212,000 |
Commercial papers | Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Assets | 61,594,000 | 3,212,000 |
Corporate debt securities |  |  |
Assets: |  |  |
Assets | 41,980,000 | 2,698,000 |
Corporate debt securities | Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Assets | 41,980,000 | 2,698,000 |
Treasury bills |  |  |
Assets: |  |  |
Assets | 4,098,000 | 749,000 |
Treasury bills | Quoted Prices in Active Markets (Level 1) |  |  |
Assets: |  |  |
Assets | 4,098,000 | 749,000 |
Agency securities |  |  |
Assets: |  |  |
Assets | 1,999,000 |  |
Agency securities | Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Assets | 1,999,000 |  |
Asset backed securities |  |  |
Assets: |  |  |
Assets | 6,440,000 |  |
Asset backed securities | Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Assets | 5,190,000 |  |
Asset backed securities | Significant Other Unobservable Inputs (Level 3) |  |  |
Assets: |  |  |
Assets | 1,250,000 |  |
Foreign corporate debt |  |  |
Assets: |  |  |
Assets | 1,019,000 |  |
Foreign corporate debt | Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Assets | 1,019,000 |  |
Foreign corporate debt | Significant Other Unobservable Inputs (Level 3) |  |  |
Assets: |  |  |
Assets | 0 |  |
SAFEs [Member] |  |  |
Liabilities: |  |  |
Liabilities |  |  | 122,588,000
SAFEs [Member] | Significant Other Unobservable Inputs (Level 3) |  |  |
Liabilities: |  |  |
Liabilities |  |  | 122,588,000
2017 Warrant |  |  |
Liabilities: |  |  |
Liabilities | 7,413,000 | 1,035,000 | 808,000
2017 Warrant | Significant Other Unobservable Inputs (Level 3) |  |  |
Liabilities: |  |  |
Liabilities | 7,413,000 | 1,035,000 | 808,000
2018 Warrant |  |  |
Liabilities: |  |  |
Liabilities | 853,000 | 87,000 | 58,000
2018 Warrant | Significant Other Unobservable Inputs (Level 3) |  |  |
Liabilities: |  |  |
Liabilities | 853,000 | $ 87,000 | $ 58,000
2020 Warrants |  |  |
Liabilities: |  |  |
Liabilities | 7,146,000 |  |
2020 Warrants | Significant Other Unobservable Inputs (Level 3) |  |  |
Liabilities: |  |  |
Liabilities | $ 7,146,000 |  |

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