| Cover | Mar. 28, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 28, 2023 |
| Entity File Number | 001-40932 |
| Entity Registrant Name | CYNGN INC. |
| Entity Central Index Key | 0001874097 |
| Entity Tax Identification Number | 46-2007094 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 1015 O’Brien Dr. |
| Entity Address, City or Town | Menlo Park |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94025 |
| City Area Code | (650) |
| Local Phone Number | 924-5905 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | CYN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Entity Information, Former Legal or Registered Name | Not Applicable |
