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Income Taxes - Additional Information (Details) - USD ($) |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 22, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Corporate tax rate |  | 21.00% | 21.00% | 21.00% | 21.00% |
Current income tax provision |  |  |  | $ 0 | $ 0 |
Deferred income tax provision |  |  |  | 0 | 0 |
Valuation allownace on net deferred tax assets |  |  |  | $ 46,998,000 | $ 29,771,000 |
Effective income tax rate |  | 0.00% | 0.00% | 0.00% | 0.00% |
Uncertain tax positions |  |  |  | $ 2,397,000 | $ 1,473,000 | $ 549,000
Tax Year 2015 [Member] | Minimum |  |  |  |  |  |
Tax year open for examination |  |  |  | 2015 |  |
Domestic Tax Authority [Member] |  |  |  |  |  |
Federal net operating loss carryforwards |  |  |  | $ 164,800,000 |  |
Federal net operating loss carryforwards indefinitely |  |  |  | 164,800,000 |  |
Federal net operating loss carry forwards with limitation |  |  |  | 164,800,000 |  |
State net operating loss carry forwards with limitation |  |  |  | 164,800,000 |  |
Domestic Tax Authority [Member] | Indefinitely [Member] |  |  |  |  |  |
Federal net operating loss carryforwards |  |  |  | 122,300,000 |  |
Federal net operating loss carryforwards indefinitely |  |  |  | 122,300,000 |  |
Federal net operating loss carry forwards with limitation |  |  |  | 122,300,000 |  |
State net operating loss carry forwards with limitation |  |  |  | 122,300,000 |  |
Domestic Tax Authority [Member] | Year Of Expiry From Two Thousand Thirty Five To Two Thousand Thirty Six [Member] |  |  |  |  |  |
Federal net operating loss carryforwards |  |  |  | 42,500,000 |  |
Federal net operating loss carryforwards indefinitely |  |  |  | 42,500,000 |  |
Federal net operating loss carry forwards with limitation |  |  |  | 42,500,000 |  |
State net operating loss carry forwards with limitation |  |  |  | 42,500,000 |  |
Domestic Tax Authority [Member] | Year Of Expiry Two Thousand And Twenty Seven [Member] |  |  |  |  |  |
Federal research and development tax credit carryforwards |  |  |  | 4,700,000 |  |
State research and development tax credit carryforwards |  |  |  | 4,700,000 |  |
State and Local Jurisdiction [Member] | Year Of Expiry From Two Thousand Thirty Five [Member] |  |  |  |  |  |
Federal net operating loss carryforwards |  |  |  | 177,900,000 |  |
Federal net operating loss carryforwards indefinitely |  |  |  | 177,900,000 |  |
Federal net operating loss carry forwards with limitation |  |  |  | 177,900,000 |  |
State net operating loss carry forwards with limitation |  |  |  | 177,900,000 |  |
State and Local Jurisdiction [Member] | Year Of Expiry Two Thousand And Twenty Seven [Member] |  |  |  |  |  |
Federal research and development tax credit carryforwards |  |  |  |  | 100,000 |
State research and development tax credit carryforwards |  |  |  |  | 100,000 |
Gores Metropoulos Inc [Member] |  |  |  |  |  |
Corporate tax rate | 21.00% |  |  |  |  |
Maximum percentage of taxable income in which NOLs limited to deduct | 80.00% |  |  |  |  |
Current income tax provision |  |  |  | 1,443,960 |  |
Deferred income tax provision |  |  |  | (2,353) |  |
Valuation allownace on net deferred tax assets |  |  |  | $ 30,238 | $ 5,635 |
Effective income tax rate |  | 21.00% |  |  |  |
Uncertain tax positions |  | $ 0 |  |  |  |
Accrued interest related to uncertain tax positions |  | 0 |  |  |  |
Accrued penalties related to uncertain tax positions |  | $ 0 |  |  |  |

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