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Capitalized software, net - Schedule of Capitalized Software, Net (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule Of Capitalized Software, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 201,876 |  | $ 106,607 |  | $ 23,443 |  | $ 699,753 |  | $ 23,443 |  | $ 16,005 |
Additions |  | 2,546,068 |  | 95,269 |  | 83,164 |  |  |  | 676,310 |  | 7,438 |
Legal entity separation-related adjustments | [1] |  |  |  |  |  |  | (699,753) |  |  |  |  |
Ending balance |  | 2,747,944 |  | 201,876 |  | 106,607 |  | 0 |  | 699,753 |  | 23,443 |
Cost [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalized Software, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 275,689 |  | 160,320 |  | 43,193 |  | 827,434 |  | 43,193 |  | 26,699 |
Additions |  | 2,557,840 |  | 115,369 |  | 117,127 |  |  |  | 784,241 |  | 16,494 |
Legal entity separation-related adjustments | [1] |  |  |  |  |  |  | (827,434) |  |  |  |  |
Ending balance |  | 2,833,529 |  | 275,689 |  | 160,320 |  | 0 |  | 827,434 |  | 43,193 |
Amortization [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Capitalized Software, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (73,813) | [2] | (53,713) | [2] | (19,750) | [2],[3] | (127,681) | [2],[3] | (19,750) | [2],[3] | (10,694) | [3]
Additions |  | (11,772) | [2] | (20,100) | [2] | (33,963) | [2] |  |  | (107,931) | [3] | (9,056) | [3]
Legal entity separation-related adjustments | [1],[2] |  |  |  |  |  |  | 127,681 |  |  |  |  |
Ending balance | [2] | $ (85,585) |  | $ (73,813) |  | $ (53,713) |  | $ 0 |  | $ (127,681) | [3] | $ (19,750) | [3]
[1] | As a result of the change in the carve-out methodology from management approach to legal entity approach, the capitalized software balance presented on December 31, 2021, is no longer presented in this unaudited condensed combined consolidated financial statement. The costs associated with software licenses used by the UAM Business will be charged by ERJ to Eve as part of the MSA and SSA. Refer to Note 3 for further information on the change in the carve-out methodology.
[2] | The amortization effect is recorded in “General and administrative” in the unaudited condensed combined consolidated statements of income.
[3] | The amortization effect is recorded in “General and administrative” in the combined statements of income.

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