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
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