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Partnerships - General Information (Details) | 1 Months Ended
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Dec. 31, 2021 | Aug. 31, 2021 | Feb. 28, 2021
Hyundai Motor Company [Member] |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Joint development agreements, period |  | 3 years |
Director [Member] | GM Global Technology Operations LLC, Affiliate of General Motors Ventures LLC and General Motors Holdings LLC [Member] |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Joint development agreements, period |  |  | 3 years
Investor [Member] | Honda Motor Company, Ltd. [Member] |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Joint development agreements, period | 2 years |  |

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