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Organization and Business Operations - Additional Information (Details) |  | 9 Months Ended | 12 Months Ended |  |  |  |
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Feb. 05, 2019 USD ($) | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2020 $ / shares | Aug. 23, 2020 USD ($) $ / shares | Aug. 20, 2020 subsidiary | Dec. 31, 2018 USD ($) $ / shares
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Unit price (in dollars per Unit) | $ / shares |  | $ 64.96 |  | $ 64.96 |  |  |  |
Common stock, value |  |  |  | $ 0 |  |  |  | $ 0
Proceeds from sale of Private Placement Warrants to Sponsor |  |  |  | $ 46,000,000 |  |  |  |
Maximum |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Unit price (in dollars per Unit) | $ / shares |  | 76.93 |  | $ 22.80 |  |  |  |
Minimum |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Unit price (in dollars per Unit) | $ / shares |  | $ 22.80 |  | $ 17.38 |  |  |  |
Proceeds from sale of Units in initial public offering |  | $ 100,000,000 |  | $ 100,000,000 |  |  |  |
Luminar |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Maximum percentage of outstanding capital stock |  | 7.50% |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.00001 |  | $ 0.00001 | $ 0.00001 |  |  | $ 0.00001
Common stock, value |  | $ 0 |  | $ 0 |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.00001 |  | $ 0.00001 |  |  |  |
Common stock, value |  | $ 0 |  | $ 0 |  |  |  |
Gores Metropoulos, Inc. |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Number of subsidiaries | subsidiary |  |  |  |  |  |  | 2 |
Maximum percentage of outstanding capital stock |  |  |  |  |  | 7.50% |  |
Amount placed in trust account |  |  | $ 400,000,000 | 400,000,000 |  |  |  |
Proceeds from sale of Units in initial public offering | $ 400,000,000 | $ 400,000,000 | 400,000,000 | 400,000,000 |  |  |  |
Proceeds from sale of Private Placement Warrants to Sponsor |  |  | $ 10,000,000 | $ 10,000,000 |  |  |  |
Maximum maturity period |  | 180 days |  | 180 days |  |  |  |
Regulatory withdrawal of interest from trust account, annual limit |  | $ 750,000 |  | $ 750,000 |  |  |  |
Regulatory withdrawal of interest from trust account, maximum period |  | 24 months |  | 24 months |  |  |  |
Redemption percentage if business combination is not completed |  | 100.00% |  | 100.00% |  |  |  |
Dissolution expenses, maximum allowed |  | $ 100,000 |  | $ 100,000 |  |  |  |
Gores Metropoulos, Inc. | Sponsor, Officers and Directors |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Ownership percentage of shares |  | 20.00% |  |  |  |  |  |
Gores Metropoulos, Inc. | Maximum |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Number of months to complete business combination |  | 24 months |  | 24 months |  |  |  |
Threshold net tangible assets |  | $ 5,000,001 |  | $ 5,000,001 |  |  |  |
Number of days to redeem the shares if Business combination is not completed |  | 10 days |  | 10 days |  |  |  |
Gores Metropoulos, Inc. | Minimum |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Percentage of fair market value |  | 80.00% |  | 80.00% |  |  |  |
Gores Metropoulos, Inc. | Private Placement |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of Private Placement Warrants to Sponsor | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  |
Gores Metropoulos, Inc. | Luminar |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Common stock, value |  |  |  |  |  | $ 2,928,828,692 |  |
Maximum aggregate amount of additional capital raised |  |  |  |  |  | $ 30,000,000 |  |
Gores Metropoulos, Inc. | Class A Common Stock |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.0001 |  | $ 0.0001 |  |  |  | $ 0.0001
Unit price (in dollars per Unit) | $ / shares |  |  | $ 10.00 | $ 10.00 |  |  |  |
Common stock, value |  | $ 158 |  | $ 129 |  |  |  |
Gores Metropoulos, Inc. | Class A Common Stock | Luminar |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  |  |  | $ 0.0001 |  |
Unit price (in dollars per Unit) | $ / shares |  |  |  |  |  | 10.00 |  |
Gores Metropoulos, Inc. | Class B Common Stock | Luminar |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  |  |  | 0.001 |  |
Unit price (in dollars per Unit) | $ / shares |  |  |  |  |  | $ 10.00 |  |

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