| Cover | Aug. 11, 2021 |
| Affiliate, Collateralized Security [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 11, 2021 |
| Entity File Number | 001-39428 |
| Entity Registrant Name | Kismet Acquisition One Corp |
| Entity Central Index Key | 0001814824 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | D8 |
| Entity Address, Address Line One | 850 Library Avenue |
| Entity Address, Address Line Two | Suite 204 |
| Entity Address, City or Town | Newark |
| Entity Address, State or Province | DE |
| Entity Address, Postal Zip Code | 19715 |
| City Area Code | (302) |
| Local Phone Number | 738-6680 |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Entity Information, Former Legal or Registered Name | Not Applicable |
| Units, each consisting of one Ordinary Share and one-half of one Warrant | |
| Affiliate, Collateralized Security [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Ordinary Share and one-half of one Warrant |
| Trading Symbol | KSMTU |
| Security Exchange Name | NASDAQ |
| Ordinary Shares, no par value | |
| Affiliate, Collateralized Security [Line Items] | |
| Title of 12(b) Security | Ordinary Shares, no par value |
| Trading Symbol | KSMT |
| Security Exchange Name | NASDAQ |
| Warrants, each whole warrant exercisable for one Ordinary Share at an exercise price of $11.50 | |
| Affiliate, Collateralized Security [Line Items] | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one Ordinary Share at an exercise price of $11.50 |
| Trading Symbol | KSMTW |
| Security Exchange Name | NASDAQ |
