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Stockholders' Equity - Narrative (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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Dec. 21, 2021 shares | Jul. 01, 2021 shares | Mar. 16, 2021 USD ($) $ / shares shares | Dec. 02, 2020 USD ($) vote shares | Dec. 31, 2021 USD ($) vote $ / shares shares | Dec. 31, 2021 USD ($) vote $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) shares | Mar. 31, 2021 shares | Dec. 03, 2020 $ / shares shares | Dec. 31, 2018 shares | Dec. 31, 2015 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  | 323,936,240 |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  | 323,936,240 |  |
Compensation expense | $ |  |  |  |  |  | $ 77,684,000 | $ 8,711,000 | $ 2,702,000 |  |  |  |
Treasury stock, shares outstanding (in shares) |  |  |  |  | 15,263,761 | 15,263,761 | 0 |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  | 0 | 0 |  |  |  |  |  |
Proceeds from exercise of warrants | $ |  |  |  |  |  | $ 153,927,000 | $ 0 | 0 |  |  |  |
Change in fair value of warrant liabilities | $ |  |  |  |  |  | $ (26,126,000) | (268,266,000) | (256,000) |  |  |  |
Vendor payments in shares in lieu of cash (in shares) |  |  |  |  |  | 291,940 |  |  |  |  |  |
Vendor stock-in-lieu of cash program | $ |  |  |  |  | $ 1,000,000 | $ 1,000,000 |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense | $ |  |  |  |  |  | 20,216,000 | $ 2,098,000 | $ 914,000 |  |  |  |
Daimler North America Corporation |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets | $ |  |  |  |  | $ 5,200,000 | 5,200,000 |  |  |  |  |  |
Daimler North America Corporation | Research and development |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense | $ |  |  |  |  |  | $ 700,000 |  |  |  |  |  |
Private and Public Warrants |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of warrants | $ |  |  | $ 153,900,000 |  |  |  |  |  |  |  |  |
Public Warrants |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  | 0 | 0 | 13,333,309 |  |  |  |  |
Warrants exercised (in shares) |  |  |  |  |  |  |  |  | 13,128,671 |  |  |
Remaining warrants redeemed (in shares) |  |  | 204,638 |  |  |  |  |  |  |  |  |
Redemption price per warrant (in dollars per share) | $ / shares |  |  | $ 0.01 |  |  |  |  |  |  |  |  |
Private Warrants |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  | 3,077,021 | 3,077,021 | 6,666,666 |  |  |  |  |
Warrants exercised (in shares) |  |  | 3,589,645 |  |  |  |  |  |  |  |  |
Stock price of warrants (in dollars per share) | $ / shares |  |  |  |  | $ 11.50 | $ 11.50 |  |  |  |  |  |
Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase transaction | $ |  |  |  |  |  | $ 4,300,000 |  |  |  |  |  |
Founders Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  | 26,206,837
Conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 1
Preferred stock, shares outstanding (in shares) |  |  |  |  | 0 | 0 | 0 | 26,206,837 |  |  | 26,206,837 |
Chief Executive Officer | Gores Metropoulos |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense | $ |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |
Chief Executive Officer | Gores Metropoulos | Founders Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares converted (in shares) |  |  |  | 22,935,412 |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 715,000,000 | 715,000,000 | 715,000,000 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.0001 | $ 0.0001 | $ 0.0001 |  |  | $ 0.0001 |  |
Common stock, shares issued (in shares) |  |  |  |  | 266,076,525 | 266,076,525 | 218,818,037 |  |  | 218,818,037 |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 250,812,764 | 250,812,764 | 218,818,037 |  |  | 218,818,037 |  |
Common stock, votes per share | vote |  |  |  |  | 1 | 1 |  |  |  |  |  |
Shares converted (in shares) |  | 10,500,000 |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | $ |  |  |  |  | $ 312,500,000 | $ 312,500,000 |  |  |  |  |  |
Treasury stock, shares outstanding (in shares) |  |  |  |  | 15,263,761 | 15,263,761 |  |  |  |  |  |
Purchase transaction | $ |  |  |  |  | $ 235,900,000 |  |  |  |  |  |  |
Class A Common Stock | Daimler North America Corporation |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares issued for services (in shares) |  |  |  |  |  | 1,500,000 |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  | 2 years |  |  |  |  |  |
Class A Common Stock | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 266,076,525 | 266,076,525 | 218,818,037 | 139,635,890 |  |  | 134,337,450 |
Shares issued for services (in shares) |  |  |  |  |  | 291,940 |  |  |  |  |  |
Class A Common Stock | Chief Executive Officer | Gores Metropoulos |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, votes per share | vote |  |  |  | 1 |  |  |  |  |  |  |  |
Class A Common Stock | Chief Executive Officer | Gores Metropoulos | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares converted (in shares) |  |  |  | 82,182,791 |  |  |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 121,000,000 | 121,000,000 | 121,000,000 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.0001 | $ 0.0001 | $ 0.0001 |  |  | $ 0.0001 |  |
Common stock, shares issued (in shares) |  |  |  |  | 97,088,670 | 97,088,670 | 105,118,203 |  |  | 105,118,203 |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 97,088,670 | 97,088,670 | 105,118,203 |  |  | 105,118,203 |  |
Common stock, votes per share | vote |  |  |  |  | 10 | 10 |  |  |  |  |  |
Shares issued upon conversion (in shares) | 4,500,000 |  |  |  |  |  |  |  |  |  |  |
Class B Common Stock | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 97,088,670 | 97,088,670 | 105,118,203 | 0 |  |  | 0 |
Class B Common Stock | Chief Executive Officer | Gores Metropoulos |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, votes per share | vote |  |  |  | 10 |  |  |  |  |  |  |  |

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