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Income Taxes - Schedule of Reconciliation of the Statutory Federal Income Tax Expense (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 22, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Total income tax expense (benefit) |  |  |  |  |  | $ 0 | $ 0
U.S. federal provision at statutory rate |  |  |  | 21.00% | 21.00% | 21.00% | 21.00%
State income taxes, net of federal benefit |  |  |  |  |  | 2.90% | 3.70%
Tax credits |  |  |  |  |  | 1.90% | 2.20%
Permanent items |  |  |  |  |  | (7.40%) | (3.90%)
Uncertain tax benefits |  |  |  |  |  | (0.90%) | (1.10%)
Change in valuation allowance |  |  |  |  |  | (17.50%) | (21.90%)
Effective tax rate |  |  |  | 0.00% | 0.00% | 0.00% | 0.00%
Gores Metropoulos, Inc. |  |  |  |  |  |  |
Income tax expense at the federal statutory rate |  |  |  |  |  | $ 1,446,224 | $ (4,617)
State income taxes - net of federal income tax benefits |  |  |  |  |  | (29,220) | (1,018)
Change in valuation allowance |  |  |  |  |  | 24,603 | $ 5,635
Total income tax expense (benefit) |  | $ (46,571) | $ 405,292 | $ 171,781 | $ 1,132,843 | $ 1,441,607 |
U.S. federal provision at statutory rate | 21.00% |  |  |  |  |  |
Effective tax rate |  |  |  | 21.00% |  |  |

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