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Related Party Transactions - Additional Information (Details) |  |  |  |  | 4 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 18, 2019 shares | Feb. 05, 2019 USD ($) $ / shares shares | Jan. 25, 2019 USD ($) | Oct. 18, 2018 USD ($) $ / shares shares | Dec. 31, 2018 | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Contractor fees |  |  |  |  |  | $ 43,000 | $ 0 | $ 0 | $ 248,000
Future minimum lease payment |  |  |  |  |  | 97,000 |  | 226,000 |
Rent expense |  |  |  |  |  | $ 77,000 | 74,000 | 99,000 | 95,000
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  |  |  | $ 11,000,000 | $ 108,000,000
Unit price (in dollars per Unit) | $ / shares |  |  |  |  |  | $ 64.96 |  | $ 64.96 |
Proceeds from sale of Private Placement Warrants to Sponsor |  |  |  |  |  |  |  | $ 46,000,000 |
Gores Metropoulos, Inc. |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock, value |  |  |  |  |  |  | $ 400,000,000 | $ 400,000,000 |
Number of warrants sold | shares |  |  |  |  |  |  | 6,666,666 | 6,666,666 |
Warrants sold, price per warrant | $ / shares |  |  |  |  |  |  | $ 1.50 | $ 1.50 |
Proceeds from sale of Private Placement Warrants to Sponsor |  |  |  |  |  |  | $ 10,000,000 | $ 10,000,000 |
Gores Metropoulos, Inc. | IPO |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock (in shares) | shares |  | 40,000,000 |  |  |  |  |  |  |
Unit price (in dollars per Unit) | $ / shares |  | $ 10.00 |  |  |  |  |  |  |
Gores Metropoulos, Inc. | Class F Common Stock |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of shares forfeited | shares |  |  |  |  |  |  | 781,250 | 781,250 |
Gores Metropoulos, Inc. | Class A Common Stock |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock (in shares) | shares |  |  |  |  |  |  | 40,000,000 | 40,000,000 |
Sale of common stock, value |  |  |  |  |  |  | $ 4,000 | $ 4,000 |
Unit price (in dollars per Unit) | $ / shares |  |  |  |  |  |  | $ 10.00 | $ 10.00 |
Gores Metropoulos, Inc. | Class A Common Stock | IPO |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock (in shares) | shares |  | 40,000,000 |  |  |  |  |  | 40,000,000 |
Gores Metropoulos, Inc. | Founder Shares |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Outstanding shares of common stock held by the initial stockholders (as a percent) | 20.00% |  |  |  |  |  |  |  |
Gores Metropoulos, Inc. | Founder Shares | Class A Common Stock |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  | 1 | 1 |  |  |  |
Gores Metropoulos, Inc. | Founder Shares | Sponsor |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock (in shares) | shares |  |  |  | 10,781,250 |  |  |  |  |
Sale of common stock, value |  |  |  | $ 25,000 |  |  |  |  |
Unit price (in dollars per Unit) | $ / shares |  |  |  | $ 0.002 |  |  |  |  |
Number of shares forfeited | shares | 781,250 |  |  |  |  |  |  |  |
Gores Metropoulos, Inc. | Founder Shares | Sponsor | Class F Common Stock |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Sale of common stock (in shares) | shares |  |  |  | 10,781,250 |  |  |  |  |
Sale of common stock, value |  |  |  | $ 25,000 |  |  |  |  |
Unit price (in dollars per Unit) | $ / shares |  |  |  | $ 0.002 |  |  |  |  |
Gores Metropoulos, Inc. | Founder Shares | Director |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of shares transferred | shares |  |  |  | 75,000 |  |  |  |  |
Gores Metropoulos, Inc. | Private Placement Warrants | Class A Common Stock |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of shares warrant may be converted | shares |  | 1 |  |  |  |  |  | 1 |
Warrants exercise price (in dollars per share) | $ / shares |  | $ 11.50 |  |  |  |  |  | $ 11.50 |
Gores Metropoulos, Inc. | Private Placement Warrants | Sponsor |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of warrants sold | shares |  | 6,666,666 |  | 6,666,666 |  |  |  |  |
Warrants sold, price per warrant | $ / shares |  | $ 1.50 |  | $ 1.50 |  |  |  |  |
Proceeds from sale of Private Placement Warrants to Sponsor |  | $ 10,000,000 |  | $ 10,000,000 |  |  |  |  |
Gores Metropoulos, Inc. | Sponsor Loan | IPO |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Expenses related to public offering |  |  |  | 300,000 |  |  |  |  |
Proceeds from Promissory Note to related party |  |  | $ 150,000 | $ 150,000 |  |  |  |  |
Unsecured promissory note |  |  |  |  |  |  |  | $ 150,000 |
Gores Metropoulos, Inc. | Administrative Services Agreement |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Payments to affiliate |  |  |  |  |  | $ 180,000 |  | 220,000 |
Gores Metropoulos, Inc. | Administrative Services Agreement | Affiliate of the Sponsor |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Monthly charge for administrative services |  |  |  |  |  | $ 20,000 |  | $ 20,000 |

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