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Public Offering - Additional Information (Details) - USD ($) |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 05, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Class Of Stock [Line Items] |  |  |  |  |  |
Unit price (in dollars per Unit) |  | $ 64.96 |  | $ 64.96 |  |
Class A Common Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock, par value |  | $ 0.00001 |  | $ 0.00001 | $ 0.00001 | $ 0.00001
Gores Metropoulos, Inc. |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Proceeds from sale of Units in initial public offering | $ 400,000,000 | $ 400,000,000 | $ 400,000,000 | $ 400,000,000 |  |
Percentage of deferred underwriting discount |  | 3.50% |  | 3.50% |  |
Gores Metropoulos, Inc. | IPO |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Units sold | 40,000,000 |  |  |  |  |
Sale of common stock (in shares) | 40,000,000 |  |  |  |  |
Unit price (in dollars per Unit) | $ 10.00 |  |  |  |  |
Proceeds from sale of Units in initial public offering | $ 400,000,000 |  |  |  |  |
Upfront underwriting discount (as a percent) | 2.00% |  |  |  |  |
Upfront underwriting discount | $ (8,000,000) |  |  |  |  |
Percentage of deferred underwriting discount | 3.50% |  |  | 3.50% |  |
Deferred underwriting discount | $ (14,000,000) |  |  |  |  |
Gores Metropoulos, Inc. | Over-Allotment Option |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Units sold | 2,500,000 |  |  |  |  |
Gores Metropoulos, Inc. | Warrant |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Warrant exercisable term if business combination is completed |  | 30 days |  | 30 days |  |
Warrant exercisable term from closing of public offer |  | 12 months |  | 12 months |  |
Warrant expiration term |  | 5 years |  | 5 years |  |
Number of months to complete business combination |  | 24 months |  | 24 months |  |
Gores Metropoulos, Inc. | Class A Common Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Sale of common stock (in shares) |  |  | 40,000,000 | 40,000,000 |  |
Unit price (in dollars per Unit) |  |  | $ 10.00 | $ 10.00 |  |
Common stock, par value |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001
Gores Metropoulos, Inc. | Class A Common Stock | IPO |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Sale of common stock (in shares) | 40,000,000 |  |  | 40,000,000 |  |
Gores Metropoulos, Inc. | Class A Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Sale of common stock (in shares) | 40,000,000 |  |  |  |  |
Number of shares that contribute each unit | 1 | 1 |  |  |  |
Common stock, par value |  | $ 0.0001 |  | $ 0.0001 |  |
Number of shares warrant may be converted |  | 1 |  |  |  |
Gores Metropoulos, Inc. | Class A Stock | Warrant |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Number of shares warrant may be converted |  |  |  | 1 |  |
Warrants exercise price (in dollars per share) |  | $ 11.50 |  | $ 11.50 |  |

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