Commitment and Contingencies (Details) $ in Thousands	Oct. 26, 2021 plaintiff	Aug. 27, 2021 board_member	May 24, 2021 USD ($)	Apr. 09, 2021 USD ($)
Loss Contingencies [Line Items]
Termination fee | $				$ 100
Damages sought (no less than) | $			$ 10,600	$ 100
McIntosh v. Katapult Holdings, Inc., et all | Pending Litigation
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff	7
FinServ | McIntosh v. Katapult Holdings, Inc., et all | Officer | Pending Litigation
Loss Contingencies [Line Items]
Number of defendants | board_member		2
Legacy Katapult | McIntosh v. Katapult Holdings, Inc., et all | Officer | Pending Litigation
Loss Contingencies [Line Items]
Number of defendants | board_member		2