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Stockholders' Equity - Additional Information (Details) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 Vote $ / shares shares | Dec. 31, 2020 $ / shares | Dec. 31, 2019 Vote $ / shares shares | Sep. 30, 2019 shares | Dec. 31, 2018 $ / shares shares
Class Of Stock [Line Items] |  |  |  |  |
Stockholder equity split | one-to-one |  |  |  |
Treasury stock shares outstanding | 480,965 |  | 363,766 |  | 262,116
Common Class A [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized | 31,500,000 |  | 20,800,000 |  | 13,000,000
Common stock, par value | $ / shares | $ 0.00001 | $ 0.00001 | $ 0.00001 |  | $ 0.00001
Common stock, shares issued | 10,244,043 |  | 10,244,043 |  | 9,855,336
Common stock, shares outstanding | 9,763,078 |  | 9,880,277 |  | 9,593,220
Common Class B [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock voting rights | ten votes |  |  |  |
Common stock, shares authorized | 7,711,738 |  | 0 |  |
Common stock, par value | $ / shares | $ 0.00001 |  | $ 0.00001 |  |
Common stock, shares issued | 0 |  | 0 |  |
Common stock, shares outstanding | 0 |  | 0 |  |
Common Stock [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized |  |  | 20,800,000 |  | 13,000,000
Common stock, shares outstanding |  |  | 9,880,277 |  | 9,593,220
Founder Shares |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Preferred stock, shares issued | 1,922,600 |  | 1,922,600 |  |
Gores Metropoulos, Inc. |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized | 220,000,000 |  | 220,000,000 |  |
Number of votes for each share | Vote | 1 |  | 1 |  |
Common stock shares issued inclusive of shares subject to redemption | 40,000,000 |  |  |  |
Class A common stock subject to possible redemption (in shares) | 38,420,462 |  | 38,713,476 | 38,639,955 | 0
Preferred stock, shares authorized | 1,000,000 |  | 1,000,000 |  | 1,000,000
Preferred stock, par value | $ / shares | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001
Preferred stock, shares issued | 0 |  | 0 |  | 0
Preferred stock, shares outstanding | 0 |  | 0 |  | 0
Gores Metropoulos, Inc. | Common Class A [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized | 200,000,000 |  | 200,000,000 |  | 200,000,000
Common stock, par value | $ / shares | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001
Common stock shares issued inclusive of shares subject to redemption |  |  | 40,000,000 |  |
Common stock shares outstanding inclusive of shares subject to redemption |  |  | 40,000,000 |  |
Class A common stock subject to possible redemption (in shares) |  |  | 38,713,476 |  | 0
Common stock, shares issued | 1,579,538 |  | 1,286,524 |  | 0
Common stock, shares outstanding | 1,579,538 |  | 1,286,524 |  | 0
Gores Metropoulos, Inc. | Class F Common Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized | 20,000,000 |  | 20,000,000 |  | 20,000,000
Common stock, par value | $ / shares | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001
Common stock, shares issued | 10,000,000 |  | 10,000,000 |  | 10,000,000
Common stock, shares outstanding | 10,000,000 |  | 10,000,000 |  |
Gores Metropoulos, Inc. | Founder Shares |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized | 20,000,000 |  |  |  |
Common stock, par value | $ / shares | $ 0.0001 |  | $ 0.0001 |  |
Common stock, shares issued | 10,000,000 |  |  |  |
Common stock, shares outstanding | 10,000,000 |  |  |  |

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