Cover - shares	9 Months Ended
	Sep. 30, 2024	Nov. 01, 2024
Entity Listings [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-39116
Entity Registrant Name	Katapult Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-2704291
Entity Address, Address Line One	5360 Legacy Drive, Building 2
Entity Address, City or Town	Plano
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75024
City Area Code	833
Local Phone Number	528-2785
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		4,390,519
Amendment Flag	false
Entity Central Index Key	0001785424
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Common Stock, par value $0.0001 per share
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 Warrants
Entity Listings [Line Items]
Title of 12(b) Security	Redeemable Warrants
Trading Symbol	KPLTW
Security Exchange Name	NASDAQ