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Reverse Capitalization - Schedule of Number of Common Stock Issued Following the Business Combination (Details) - $ / shares | Mar. 12, 2021 | Dec. 31, 2021 | Mar. 11, 2021 | Dec. 31, 2020
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Business Acquisition [Line Items] |  |  |  |
Total shares of common stock at March 12, 2021 | 211,409,752 | 214,997,000 | 24,150,000 | 151,366,000
Number of Share Redemption of IPV Share | (30,874) |  |  |
Adjustment To Common Stock Issued Shares | 24,119,126 |  |  |
IPV founder shares | 6,905,500 |  |  |
Shares issued in PIPE | 28,318,478 |  |  |
Business Combination and PIPE shares | 59,343,104 |  |  |
Legacy Aeva shares(1) | 152,066,648 |  |  |
Total shares of common stock immediately after Business Combination | 211,409,752 |  |  |
Aeva exercise of warrants | $ 0 |  |  |
Total shares of common stock at March 12, 2021 | 211,409,752 | 214,997,000 | 24,150,000 | 151,366,000

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