| Cover | Aug. 10, 2021 |
| Entity Listings [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 10, 2022 |
| Entity Registrant Name | KATAPULT HOLDINGS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39116 |
| Entity Tax Identification Number | 81-4424170 |
| Entity Address, Address Line One | 5204 Tennyson Parkway |
| Entity Address, Address Line Two | Suite 500 |
| Entity Address, City or Town | Plano |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75024 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001785424 |
| Common Stock | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | KPLT |
| Security Exchange Name | NASDAQ |
| Redeemable Warrant | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Redeemable Warrants |
| Trading Symbol | KPLTW |
| Security Exchange Name | NASDAQ |
