Cover Page - shares	6 Months Ended
	Jun. 30, 2023	Aug. 10, 2023
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2023
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2023
Entity Registrant Name	KLDiscovery Inc.
Entity Central Index Key	0001752474
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Small Business	true
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		43,086,267
Entity File Number	001-38789
Entity Tax Identification Number	61-1898603
Entity Address, Address Line One	9023 Columbine Road
Entity Address, City or Town	Eden Prairie
Entity Address, State or Province	MN
Entity Address, Postal Zip Code	55347
City Area Code	703
Local Phone Number	288-3380
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false